From 528357a38e384d26fab10fa89811590ab1d5a29c Mon Sep 17 00:00:00 2001
From: mtlcl410 <2368091+mtlcl410@users.noreply.github.com>
Date: Thu, 15 Oct 2026 09:40:50 +0800
Subject: [PATCH] M6: custom stamps can carry a line filled in when they are
 placed (#1741)

Create Custom Stamp offers an optional line under the picture, a
template with {name}, {date} and {time} filled in when the stamp is
placed, in the built-in dynamic stamps' format, and kept with the stamp
library. The picture keeps its shape above the line and the stamp widens
to fit the line. stamp_custom takes the same line.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 ROADMAP.md                               |  1 +
 crates/annot/src/appearance.rs           | 57 ++++++++++++++++++++----
 crates/annot/src/create.rs               | 21 ++++++++-
 crates/annot/src/lib.rs                  |  2 +-
 crates/annot/src/types.rs                |  6 ++-
 crates/automation/src/comments.rs        | 12 ++++-
 crates/automation/src/tools.rs           |  3 +-
 crates/automation/tests/it/automation.rs | 33 ++++++++++++++
 crates/engine/src/edit.rs                |  2 +
 crates/engine/src/edit/run.rs            |  9 ++--
 crates/engine/src/lib.rs                 |  3 ++
 crates/engine/src/session/view.rs        | 24 ++++++++--
 crates/engine/src/signature_image.rs     |  1 +
 crates/engine/src/tests.rs               | 44 +++++++++++++++++-
 crates/ui-egui/src/canvas.rs             |  6 +++
 crates/ui-egui/src/i18n/ar.tsv           |  2 +
 crates/ui-egui/src/i18n/bg.tsv           |  2 +
 crates/ui-egui/src/i18n/cs.tsv           |  2 +
 crates/ui-egui/src/i18n/de.tsv           |  2 +
 crates/ui-egui/src/i18n/el.tsv           |  2 +
 crates/ui-egui/src/i18n/es.tsv           |  2 +
 crates/ui-egui/src/i18n/fr.tsv           |  2 +
 crates/ui-egui/src/i18n/hu.tsv           |  2 +
 crates/ui-egui/src/i18n/it.tsv           |  2 +
 crates/ui-egui/src/i18n/ja.tsv           |  2 +
 crates/ui-egui/src/i18n/kk.tsv           |  2 +
 crates/ui-egui/src/i18n/lt.tsv           |  2 +
 crates/ui-egui/src/i18n/pl.tsv           |  2 +
 crates/ui-egui/src/i18n/pt-br.tsv        |  2 +
 crates/ui-egui/src/i18n/ru.tsv           |  2 +
 crates/ui-egui/src/i18n/sl.tsv           |  2 +
 crates/ui-egui/src/i18n/te.tsv           |  2 +
 crates/ui-egui/src/i18n/tr.tsv           |  2 +
 crates/ui-egui/src/i18n/uk.tsv           |  2 +
 crates/ui-egui/src/i18n/zh-hans.tsv      |  2 +
 crates/ui-egui/src/i18n/zh-hant.tsv      |  3 ++
 crates/ui-egui/src/tools/stamps_ui.rs    | 31 +++++++++++--
 crates/ui-egui/tests/it/stamps.rs        | 46 +++++++++++++++++++
 parity/acrobat-features.toml             |  4 +-
 39 files changed, 322 insertions(+), 26 deletions(-)

diff --git a/ROADMAP.md b/ROADMAP.md
index 56f6237e8d..a0d7599be4 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -431,6 +431,7 @@ Ranked; detail and the full milestone table in [docs/roadmap.md](docs/roadmap.md
 
 - **2026-10-15 (M3, #1248):** A fresh install follows the desktop's appearance: the theme preference defaults to System (dark on a dark desktop, Light where the desktop says nothing); saved settings and `--theme` still win. Dark page rendering is Reading colours, and the page reading themes are #1732.
 - **2026-10-15 (M3, #1767):** Restore last view settings when reopening documents, as Acrobat's preference does: a file opened again shows the page, zoom and page display it was last shown with (remembered for the last 100 files when a tab closes or settings are saved), over the file's own initial view; on by default, Preferences ▸ Documents and view turns it off.
+- **2026-10-15 (M6, #1741):** Custom stamps can be dynamic: Create Custom Stamp adds an optional line under the picture, a template with {name}, {date} and {time} filled in when the stamp is placed (the built-in dynamic stamps' format), kept in the stamp library; `stamp_custom` takes the same `line`.
 - **2026-10-13 (M3, native-opening candidate):** Chosen tools survive preparation, conversion and password retries; startup intake waits for pending preparation. Regression tests cover completion, cancellation and document identity. Estimates unchanged.
 - **2026-10-13 (community, M3, #531 touchpad momentum):** On Wayland a two-finger swipe keeps gliding after the fingers lift and slows to a stop, measured from the gesture's last 0.1 s and decaying with a 0.35 s time constant through the #759 1:1 path. Any wheel input, click, key, zoom or edge ends it (fingers resting on the touchpad don't yet: the vendored winit binds no Wayland hold gestures); single-page paging, macOS (which sends its own momentum), the web, and Animation effects Off never glide. Unit tests for the physics and two headless view tests. Estimates unchanged.
 - **2026-10-13 (M3, native-open admission):** Later prepared replies stay queued while a modal or native picker owns the foreground. Picker completion, cancellation and abandonment wake retained opens. Regressions cover recipient ownership, exactly-once admission, source/history preservation and one-shot repaint requests. Estimates unchanged.
diff --git a/crates/annot/src/appearance.rs b/crates/annot/src/appearance.rs
index abc746c0dd..3eb962f45d 100644
--- a/crates/annot/src/appearance.rs
+++ b/crates/annot/src/appearance.rs
@@ -316,7 +316,9 @@ pub fn undrawable_text(d: &Dict) -> Option<(&'static str, char)> {
         b"FreeText" => ("the comment's text", text(b"Contents")?),
         b"Line" if !d.contains(b"PCMeasureValue") => ("the line's caption", line_caption(d)?),
         b"Line" | b"PolyLine" | b"Polygon" => ("the measurement label", text(b"PCMeasureValue")?),
-        b"Stamp" if matches!(d.get(b"PCStamp"), Some(Object::Bool(true))) => ("the stamp's \"By\" line", text(b"PCByLine")?),
+        b"Stamp" if matches!(d.get(b"PCStamp"), Some(Object::Bool(true))) || d.contains(b"PCPicture") => {
+            ("the stamp's \"By\" line", text(b"PCByLine")?)
+        }
         // Drawn in Helvetica when the redaction is applied: refused when it is marked.
         b"Redact" => ("the redaction's overlay text", text(b"OverlayText")?),
         _ => return None,
@@ -783,19 +785,58 @@ fn draw_stamp(context: &AppearanceContext<'_>, mut drawing: AppearanceDrawing) -
     // bounding box to `/Rect` (ISO 32000-2 §12.5.5), so it reads upright as displayed.
     if let Some(pic) = d.get(b"PCPicture").and_then(Object::as_ref) {
         let [x0, y0, x1, y1] = rect;
-        let (w, h) = (x1 - x0, y1 - y0);
         let image = matches!(d.get(b"PCPictureImage"), Some(Object::Bool(true)));
-        let place = if image {
-            format!("{} 0 0 {} {} {} cm", n(w), n(h), n(x0), n(y0))
-        } else {
-            let size = nums(d, b"PCPictureSize").filter(|s| s.len() == 2 && s[0] > 0.0 && s[1] > 0.0)?;
-            format!("{} 0 0 {} {} {} cm", n(w / size[0]), n(h / size[1]), n(x0), n(y0))
+        let size = nums(d, b"PCPictureSize").filter(|s| s.len() == 2 && s[0] > 0.0 && s[1] > 0.0);
+        // A text line (#1741) takes the bottom of the rectangle, and the picture keeps its
+        // shape, centred above it. Without one the picture fills the rectangle.
+        let line = d.get(b"PCByLine").and_then(Object::as_string).map(PdfString::to_text).filter(|l| !l.trim().is_empty());
+        let band = if line.is_some() { (y1 - y0) * crate::CUSTOM_LINE_BAND } else { 0.0 };
+        let (w, h) = (x1 - x0, y1 - y0 - band);
+        let place = match (&line, &size) {
+            (Some(_), Some(sz)) => {
+                let k = (w / sz[0]).min(h / sz[1]).max(0.0);
+                let (pw, ph) = (sz[0] * k, sz[1] * k);
+                let (px, py) = (x0 + (w - pw) / 2.0, y0 + band + (h - ph) / 2.0);
+                if image {
+                    format!("{} 0 0 {} {} {} cm", n(pw), n(ph), n(px), n(py))
+                } else {
+                    format!("{} 0 0 {} {} {} cm", n(k), n(k), n(px), n(py))
+                }
+            }
+            _ if image => format!("{} 0 0 {} {} {} cm", n(w), n(h), n(x0), n(y0 + band)),
+            _ => {
+                let sz = size?;
+                format!("{} 0 0 {} {} {} cm", n(w / sz[0]), n(h / sz[1]), n(x0), n(y0 + band))
+            }
         };
         c.push_str(&format!("q {place} /Pic Do Q\n"));
+        // Bytes from here: the line is WinAnsi, not UTF-8.
+        let mut content = std::mem::take(c).into_bytes();
+        if let Some(l) = &line {
+            // Centred in the band, at its usual size unless the stamp was made narrower.
+            let mut size = band * crate::CUSTOM_LINE_TEXT;
+            let tw = text_width(l, size);
+            if tw > w - 4.0 && tw > 0.0 {
+                size *= ((w - 4.0) / tw).max(0.0);
+            }
+            let tw = text_width(l, size);
+            let ty = y0 + (band - size * 0.72) / 2.0;
+            content.extend(format!("BT\n0.2 0.2 0.2 rg\n/Helv {} Tf\n1 0 0 1 {} {} Tm ", n(size), n(x0 + (w - tw) / 2.0), n(ty)).bytes());
+            content.extend(literal(&win_ansi(l)));
+            content.extend_from_slice(b" Tj\nET\n");
+            let mut f = Dict::new();
+            f.set(b"Type".to_vec(), Object::name("Font"));
+            f.set(b"Subtype".to_vec(), Object::name("Type1"));
+            f.set(b"BaseFont".to_vec(), Object::name("Helvetica"));
+            f.set(b"Encoding".to_vec(), Object::name("WinAnsiEncoding"));
+            let mut fonts = Dict::new();
+            fonts.set(b"Helv".to_vec(), Object::Dict(f));
+            res.set(b"Font".to_vec(), Object::Dict(fonts));
+        }
         let mut xo = Dict::new();
         xo.set(b"Pic".to_vec(), Object::Ref(pic));
         res.set(b"XObject".to_vec(), Object::Dict(xo));
-        let mut stream = form(rect, c.as_bytes(), res);
+        let mut stream = form(rect, &content, res);
         let turn = picture_turn(d);
         if image && turn != 0 {
             // The page's view matrix without its offset: display axes in user space.
diff --git a/crates/annot/src/create.rs b/crates/annot/src/create.rs
index a6db5b940b..522e5ec8b1 100644
--- a/crates/annot/src/create.rs
+++ b/crates/annot/src/create.rs
@@ -277,12 +277,15 @@ pub fn add_annotation(doc: &mut Document, new: &NewAnnotation, meta: &Meta) -> R
             let list = contours.iter().filter(|c| c.len() > 2).map(|c| num_array(&c.iter().flat_map(|p| [p[0], p[1]]).collect::<Vec<_>>())).collect();
             d.set(b"PCOutline".to_vec(), Object::Array(list));
         }
-        Shape::CustomStamp { name, picture, image, size, .. } => {
+        Shape::CustomStamp { name, picture, image, size, line, .. } => {
             let clean: String = name.chars().filter(char::is_ascii_alphanumeric).collect();
             d.set(b"Name".to_vec(), Object::name(&format!("PCCustom{clean}")));
             d.set(b"PCPicture".to_vec(), Object::Ref(*picture));
             d.set(b"PCPictureImage".to_vec(), Object::Bool(*image));
             d.set(b"PCPictureSize".to_vec(), num_array(&[size.0, size.1]));
+            if let Some(l) = line.as_deref().map(str::trim).filter(|l| !l.is_empty()) {
+                d.set(b"PCByLine".to_vec(), PdfString::text(l));
+            }
             // An image signature's rectangle is in user space; on a turned page its appearance is
             // turned back (see `appearance::build`), so it reads upright as displayed.
             if *image && matches!(clean.as_str(), "Signature" | "Initials") {
@@ -456,6 +459,22 @@ fn add_popup(doc: &mut Document, parent: ObjRef, rect: Option<[f64; 4]>, annots:
     Ok(())
 }
 
+/// The share of a custom stamp's height its text line takes (the rest is the picture).
+pub const CUSTOM_LINE_BAND: f64 = 0.22;
+
+/// A custom stamp line's text height as a share of its band.
+pub const CUSTOM_LINE_TEXT: f64 = 0.62;
+
+/// The natural size of a custom stamp whose picture is `picture` points (#1741): with `line`,
+/// the band under the picture is added, and the stamp is as wide as the line at its usual size
+/// when that is wider than the picture.
+pub fn custom_stamp_size(picture: (f64, f64), line: Option<&str>) -> (f64, f64) {
+    let Some(line) = line else { return picture };
+    let h = picture.1 / (1.0 - CUSTOM_LINE_BAND);
+    let text = appearance::text_width(line, h * CUSTOM_LINE_BAND * CUSTOM_LINE_TEXT) + 8.0;
+    (picture.0.max(text), h)
+}
+
 /// Counterrotate a newly placed picture stamp's appearance into displayed-page axes.
 /// The picture may be an image or a PDF page. The normal appearance's transformed bounding
 /// box is fitted to `/Rect` by PDF viewers.
diff --git a/crates/annot/src/lib.rs b/crates/annot/src/lib.rs
index 7bd0894c66..8d615acae6 100644
--- a/crates/annot/src/lib.rs
+++ b/crates/annot/src/lib.rs
@@ -27,7 +27,7 @@ mod types;
 
 #[cfg(test)]
 use create::num_array;
-pub use create::{add_annotation, callout_attach, orient_image_stamp};
+pub use create::{CUSTOM_LINE_BAND, CUSTOM_LINE_TEXT, add_annotation, callout_attach, custom_stamp_size, orient_image_stamp};
 pub use draw::{AppearanceCache, set_appearance, with_missing_appearances, with_missing_appearances_cached};
 pub use info::{Props, Summary, is_comment_subtype, props, set_info, summaries};
 #[cfg(test)]
diff --git a/crates/annot/src/types.rs b/crates/annot/src/types.rs
index bd3409b5ae..67eb18d605 100644
--- a/crates/annot/src/types.rs
+++ b/crates/annot/src/types.rs
@@ -391,13 +391,17 @@ pub enum Shape {
         contours: Vec<Vec<[f64; 2]>>,
     },
     /// A custom stamp: a picture already in the document (an image XObject, or a form XObject
-    /// whose `/Matrix` maps it to `size` points) filling `rect`, named `name`.
+    /// whose `/Matrix` maps it to `size` points) filling `rect`, named `name`. With `line`, a
+    /// line of text under the picture (#1741): a dynamic stamp's name, date and time, filled in
+    /// when it was placed; the picture then fills the rectangle above it
+    /// ([`CUSTOM_LINE_BAND`](crate::CUSTOM_LINE_BAND)).
     CustomStamp {
         rect: [f64; 4],
         name: String,
         picture: ObjRef,
         image: bool,
         size: (f64, f64),
+        line: Option<String>,
     },
     /// A redaction mark (§12.5.6.23) over quadrilaterals (text) or one rectangle as a quad
     /// (areas, pages). `overlay` is the text shown on the box once applied, drawn with `look`.
diff --git a/crates/automation/src/comments.rs b/crates/automation/src/comments.rs
index f87fd0b58e..68cbba2bbe 100644
--- a/crates/automation/src/comments.rs
+++ b/crates/automation/src/comments.rs
@@ -726,6 +726,7 @@ impl Automation {
         let bytes = crate::read_input(&path)?;
         let file = path.file_name().map(|n| n.to_string_lossy().into_owned()).unwrap_or_default();
         let name = a.opt_str("name")?.map(str::to_owned).unwrap_or_else(|| file.rsplit_once('.').map_or(file.clone(), |(s, _)| s.to_owned()));
+        let author = a.opt_str("author")?.unwrap_or(DEFAULT_AUTHOR).to_string();
         let edit = Edit::AddCustomStamp {
             page,
             rect,
@@ -735,7 +736,16 @@ impl Automation {
                 bytes: std::sync::Arc::new(bytes),
                 page: a.opt_int("file_page")?.unwrap_or(1).max(1) as usize - 1,
             },
-            author: a.opt_str("author")?.unwrap_or(DEFAULT_AUTHOR).to_string(),
+            line: None,
+            author: author.clone(),
+        };
+        // A dynamic line (#1741): `{name}`, `{date}` and `{time}` filled in now.
+        let edit = match (edit, a.opt_str("line")?) {
+            (Edit::AddCustomStamp { page, rect, name, file, author, .. }, Some(t)) if !t.trim().is_empty() => {
+                let line = Some(self.session().stamp_line(t, &author));
+                Edit::AddCustomStamp { page, rect, name, file, author, line }
+            }
+            (edit, _) => edit,
         };
         self.apply(a, edit)
     }
diff --git a/crates/automation/src/tools.rs b/crates/automation/src/tools.rs
index c6c200cece..b6251c182a 100644
--- a/crates/automation/src/tools.rs
+++ b/crates/automation/src/tools.rs
@@ -446,7 +446,7 @@ pub fn tools() -> Vec<ToolDef> {
             }),
             &["doc", "page", "rect", "rows"],
         )),
-        t("stamp_custom", "Add a custom stamp", "Stamp a picture: a PDF page (file_page, default 1, kept as vector content in a form XObject) or an image file. Either centred at at [x, y] (points from the top-left of the displayed page) at its natural size, at most 200 pt, or fitted inside rect [x0, y0, x1, y1] (the same coordinates; each side 1–14400 pt), scaled to keep its shape and centred in the box. Like at, rect is not clipped to the page. Pass at or rect, not both. name labels it (default: the file name). Undoable.")
+        t("stamp_custom", "Add a custom stamp", "Stamp a picture: a PDF page (file_page, default 1, kept as vector content in a form XObject) or an image file. Either centred at at [x, y] (points from the top-left of the displayed page) at its natural size, at most 200 pt, or fitted inside rect [x0, y0, x1, y1] (the same coordinates; each side 1–14400 pt), scaled to keep its shape and centred in the box. Like at, rect is not clipped to the page. Pass at or rect, not both. name labels it (default: the file name). line adds a text line under the picture with {name} (the author), {date} and {time} filled in now, as a dynamic stamp. Undoable.")
             .cmd("comment.stamp")
             .with(schema(
                 json!({
@@ -458,6 +458,7 @@ pub fn tools() -> Vec<ToolDef> {
                     "file_page": { "type": "integer", "minimum": 1 },
                     "name": { "type": "string" },
                     "author": { "type": "string" },
+                    "line": { "type": "string", "maxLength": 200 },
                 }),
                 &["doc", "page", "path"],
             )),
diff --git a/crates/automation/tests/it/automation.rs b/crates/automation/tests/it/automation.rs
index 6a5765b911..a769eb83d1 100644
--- a/crates/automation/tests/it/automation.rs
+++ b/crates/automation/tests/it/automation.rs
@@ -9414,6 +9414,39 @@ fn text_box_and_callout_fill_and_border_through_tools() {
     }
 }
 
+/// A custom stamp can carry a dynamic line (#1741): `{name}`, `{date}` and `{time}` are filled in
+/// when it is placed and drawn under the picture, which keeps its shape; the stamp widens to fit
+/// the line; a line too long is cut.
+#[test]
+fn a_custom_stamp_line_is_filled_in_when_placed() {
+    let dir = workdir("stamp_line");
+    let mut a = auto(&dir);
+    let doc = ok(&mut a, "doc_open", json!({ "path": "a.pdf" }))["doc"].as_u64().unwrap();
+    ok(&mut a, "stamp_custom", json!({ "doc": doc, "page": 2, "path": "b.pdf", "file_page": 2, "at": [100, 150], "name": "Plain" }));
+    ok(
+        &mut a,
+        "stamp_custom",
+        json!({ "doc": doc, "page": 1, "path": "b.pdf", "file_page": 2, "at": [100, 150], "name": "Logo", "author": "Ada", "line": "Received {date} {time} by {name}" }),
+    );
+    // The clock is 2023-11-14 22:13:20, taken as local time.
+    let text = page_text(&mut a, doc)[0].clone();
+    assert!(text.contains("Received Nov 14, 2023 10:13 pm by Ada"), "{text}");
+    let list = ok(&mut a, "comment_list", json!({ "doc": doc }));
+    let rect = |page: u64| {
+        let c = list["comments"].as_array().unwrap().iter().find(|c| c["page"] == page).unwrap();
+        let r: Vec<f64> = c["rect"].as_array().unwrap().iter().map(|v| v.as_f64().unwrap()).collect();
+        (r[2] - r[0], r[3] - r[1])
+    };
+    let ((pw, ph), (lw, lh)) = (rect(2), rect(1));
+    // The stamp stays within the natural 200 pt. Its line, at its usual size, is wider than the
+    // picture, so the stamp is wider than the picture's shape with the band added.
+    assert!(lw / lh > pw / ph * (1.0 - 0.22) + 0.01, "widened for the line: {pw}x{ph} vs {lw}x{lh}");
+    // A line past the limit is cut, not refused.
+    let long = "x".repeat(500);
+    ok(&mut a, "stamp_custom", json!({ "doc": doc, "page": 3, "path": "b.pdf", "file_page": 2, "at": [100, 150], "line": long }));
+    assert!(page_text(&mut a, doc)[2].matches('x').count() <= 200);
+}
+
 /// Three paragraphs: Alpha (two rows), Bravo (one row) and Charlie (two rows), at the leading
 /// of #2516. Alpha's last baseline is 35.6 pt above Bravo's; moving Alpha down 21.2 pt leaves
 /// 14.4 pt, Alpha's own leading, so the next read groups the two as one paragraph.
diff --git a/crates/engine/src/edit.rs b/crates/engine/src/edit.rs
index 8f43689aa9..83cbfba40a 100644
--- a/crates/engine/src/edit.rs
+++ b/crates/engine/src/edit.rs
@@ -150,12 +150,14 @@ pub enum Edit {
     /// `rect` is a point: the stamp is centred there at its natural size (at most 200 pt).
     /// Any other `rect` is a box: the picture is scaled to fit inside it, keeping its shape,
     /// and centred in it (#4077).
+    /// `line` is a text line under the picture, already filled in ([`Session::stamp_line`](crate::Session::stamp_line)).
     AddCustomStamp {
         page: usize,
         rect: [f64; 4],
         name: String,
         file: MarkFile,
         author: String,
+        line: Option<String>,
     },
     /// Delete the comment at `index` in the page's `/Annots`, with its pop-up and replies.
     DeleteAnnotation {
diff --git a/crates/engine/src/edit/run.rs b/crates/engine/src/edit/run.rs
index c6b1a7438b..4e1020ead5 100644
--- a/crates/engine/src/edit/run.rs
+++ b/crates/engine/src/edit/run.rs
@@ -325,9 +325,12 @@ pub(crate) fn run_edit(doc: &mut pdfcraft_cos::Document, edit: &Edit, cx: &mut E
         Edit::AddAnnotation(a) => {
             pdfcraft_annot::add_annotation(doc, a, &cx.meta())?;
         }
-        Edit::AddCustomStamp { page, rect, name, file, author } => {
+        Edit::AddCustomStamp { page, rect, name, file, author, line } => {
             let src = mark_source(doc, file)?;
-            let (sw, sh) = (src.size.0.max(1.0), src.size.1.max(1.0));
+            let line = line.as_deref().map(str::trim).filter(|l| !l.is_empty()).map(|l| l.chars().take(crate::MAX_STAMP_LINE).collect::<String>());
+            let picture = (src.size.0.max(1.0), src.size.1.max(1.0));
+            // A text line adds its band under the picture, and widens the stamp to fit (#1741).
+            let (sw, sh) = pdfcraft_annot::custom_stamp_size(picture, line.as_deref());
             let natural = rect[2] == rect[0] && rect[3] == rect[1];
             let rotation = pdfcraft_organize::page_rotation(doc, *page)?;
             // The picture as displayed: a quarter turn swaps its sides in user space.
@@ -339,7 +342,7 @@ pub(crate) fn run_edit(doc: &mut pdfcraft_cos::Document, edit: &Edit, cx: &mut E
             } else {
                 fit_picture(*rect, dw, dh)
             };
-            let shape = Shape::CustomStamp { rect, name: name.clone(), picture: src.xobject, image: src.image, size: (sw, sh) };
+            let shape = Shape::CustomStamp { rect, name: name.clone(), picture: src.xobject, image: src.image, size: picture, line };
             let style = pdfcraft_annot::Style::default_for(&shape);
             let new = NewAnnotation { page: *page, shape, style, contents: name.clone(), author: author.clone() };
             let index = pdfcraft_annot::add_annotation(doc, &new, &cx.meta())?;
diff --git a/crates/engine/src/lib.rs b/crates/engine/src/lib.rs
index 0b49cfd4e1..635eb33f11 100644
--- a/crates/engine/src/lib.rs
+++ b/crates/engine/src/lib.rs
@@ -166,5 +166,8 @@ fn display_config(config: &pdfcraft_render::RenderConfig) -> pdfcraft_render::Re
     config.clone().on_screen()
 }
 
+/// How long a custom stamp's text line may be, in characters (#1741).
+pub const MAX_STAMP_LINE: usize = 200;
+
 #[cfg(test)]
 mod tests;
diff --git a/crates/engine/src/session/view.rs b/crates/engine/src/session/view.rs
index c0e7417c8e..d581fc81bd 100644
--- a/crates/engine/src/session/view.rs
+++ b/crates/engine/src/session/view.rs
@@ -62,20 +62,36 @@ impl Session {
         return None;
     }
 
-    /// Today's date in local time: (year, month, day). With an injected clock (tests) the clock
-    /// is taken as local time.
     /// A dynamic stamp's second line: "By Ada at 2:14 pm, Oct 02, 2026" (local time).
     pub fn stamp_by_line(&self, author: &str) -> String {
+        let (date, time) = self.stamp_date_time();
+        let who = if author.trim().is_empty() { String::new() } else { format!("By {} ", author.trim()) };
+        format!("{who}at {time}, {date}")
+    }
+
+    /// A custom stamp's text line (#1741): `template` with `{name}` (the author), `{date}`
+    /// ("Oct 02, 2026") and `{time}` ("2:14 pm") filled in now, in local time, as the dynamic
+    /// stamps' "By" line has them. Cut to [`MAX_STAMP_LINE`](crate::MAX_STAMP_LINE) characters.
+    pub fn stamp_line(&self, template: &str, author: &str) -> String {
+        let (date, time) = self.stamp_date_time();
+        let filled = template.trim().replace("{name}", author.trim()).replace("{date}", &date).replace("{time}", &time);
+        filled.chars().take(crate::MAX_STAMP_LINE).collect()
+    }
+
+    /// Now, as the stamps write it: ("Oct 02, 2026", "2:14 pm"), local time.
+    fn stamp_date_time(&self) -> (String, String) {
         let offset = self.local_offset();
         let d = self.now().map(|t| pdfcraft_cos::pdf_date(t + offset)).unwrap_or_default();
         let num = |a: usize, b: usize| d.get(a..b).and_then(|s| s.parse::<u32>().ok()).unwrap_or(0);
         let (y, mo, day, hh, mm) = (num(2, 6), num(6, 8), num(8, 10), num(10, 12), num(12, 14));
         const MONTHS: [&str; 12] = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
         let h12 = if hh % 12 == 0 { 12 } else { hh % 12 };
-        let who = if author.trim().is_empty() { String::new() } else { format!("By {} ", author.trim()) };
-        format!("{who}at {h12}:{mm:02} {}, {} {day:02}, {y}", if hh < 12 { "am" } else { "pm" }, MONTHS[(mo.clamp(1, 12) - 1) as usize])
+        let month = MONTHS.get(mo.clamp(1, 12) as usize - 1).copied().unwrap_or("Jan");
+        (format!("{month} {day:02}, {y}"), format!("{h12}:{mm:02} {}", if hh < 12 { "am" } else { "pm" }))
     }
 
+    /// Today's date in local time: (year, month, day). With an injected clock (tests) the clock
+    /// is taken as local time.
     pub fn today(&self) -> (i64, u32, u32) {
         let offset = self.local_offset();
         self.now().map(|t| pdfcraft_cos::pdf_date(t + offset)).as_deref().and_then(parse_ymd).unwrap_or((1970, 1, 1))
diff --git a/crates/engine/src/signature_image.rs b/crates/engine/src/signature_image.rs
index ae8842ddfb..001bb33381 100644
--- a/crates/engine/src/signature_image.rs
+++ b/crates/engine/src/signature_image.rs
@@ -235,6 +235,7 @@ impl SignatureImage {
                 name: if initials { "Initials" } else { "Signature" }.into(),
                 file: MarkFile { name: "signature.png".into(), bytes: self.bytes.clone(), page: 0 },
                 author: author.into(),
+                line: None,
             }],
         })
     }
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 333d0fd498..8891fe18c3 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -73,6 +73,7 @@ fn custom_image_stamp_keeps_displayed_orientation_on_rotated_pages() {
                     name: "Original quadrants".into(),
                     file: MarkFile { name: "quadrants.png".into(), bytes: bytes.clone(), page: 0 },
                     author: "Test".into(),
+                    line: None,
                 },
             )
             .unwrap();
@@ -408,6 +409,7 @@ fn explicit_image_stamps_keep_displayed_orientation_on_rotated_pages() {
                     name: "Original quadrants".into(),
                     file: MarkFile { name: "quadrants.png".into(), bytes: bytes.clone(), page: 0 },
                     author: "Test".into(),
+                    line: None,
                 },
             )
             .unwrap();
@@ -460,6 +462,7 @@ fn pdf_page_stamps_keep_displayed_orientation_on_rotated_pages() {
                     name: "Half red".into(),
                     file: MarkFile { name: "half.pdf".into(), bytes: bytes.clone(), page: 0 },
                     author: "Test".into(),
+                    line: None,
                 },
             )
             .unwrap();
@@ -8463,7 +8466,8 @@ fn a_phone_photo_used_as_a_custom_stamp_is_embedded_upright() {
     // A click places the stamp at its natural size: 30 x 20 pt as stored, 20 x 30 pt upright.
     // Named "Signature" so `signature_image` finds its picture.
     let file = MarkFile { name: "photo.jpg".into(), bytes: Arc::new(phone_jpeg()), page: 0 };
-    let stamp = Edit::AddCustomStamp { page: 0, rect: [100.0, 100.0, 100.0, 100.0], name: "Signature".into(), file, author: "Ada".into() };
+    let stamp =
+        Edit::AddCustomStamp { page: 0, rect: [100.0, 100.0, 100.0, 100.0], name: "Signature".into(), file, author: "Ada".into(), line: None };
     session.apply(id, stamp).unwrap();
     let cos = &session.get(id).unwrap().editor.as_ref().unwrap().cos;
     let picture = pdfcraft_annot::signature_image(cos, 0, 0).unwrap().unwrap();
@@ -9409,3 +9413,41 @@ fn repeated_backdrop_artwork_survives_background_undo_redo_and_both_save_modes()
     s.apply(rewritten, Edit::RemoveMarks { kind: MarkKind::Background }).unwrap();
     black(&s, rewritten);
 }
+
+/// A custom stamp's line template (#1741) fills in the author, date and time as the dynamic
+/// stamps write them, and the "By" line itself is unchanged.
+#[test]
+fn stamp_lines_fill_in_the_name_date_and_time() {
+    let s = Session::new().with_clock(|| 1_700_000_000);
+    assert_eq!(s.stamp_line("Received {date} {time} by {name}", " Ada "), "Received Nov 14, 2023 10:13 pm by Ada");
+    assert_eq!(s.stamp_by_line("Ada"), "By Ada at 10:13 pm, Nov 14, 2023");
+    assert_eq!(s.stamp_by_line(""), "at 10:13 pm, Nov 14, 2023");
+    assert_eq!(s.stamp_line(&"{date}".repeat(100), "Ada").chars().count(), MAX_STAMP_LINE);
+}
+
+/// A custom stamp's line keeps Western European letters (#1741): the appearance holds them as
+/// WinAnsi bytes. A lossy UTF-8 round trip once turned them into replacement characters.
+#[test]
+fn a_custom_stamp_line_keeps_accented_letters() {
+    let image = image::RgbaImage::from_pixel(80, 40, image::Rgba([20, 120, 220, 255]));
+    let mut png = std::io::Cursor::new(Vec::new());
+    image.write_to(&mut png, image::ImageFormat::Png).unwrap();
+    let (mut session, id) = session_with(1);
+    let edit = Edit::AddCustomStamp {
+        page: 0,
+        rect: [100.0, 100.0, 100.0, 100.0],
+        name: "Logo".into(),
+        file: MarkFile { name: "logo.png".into(), bytes: Arc::new(png.into_inner()), page: 0 },
+        author: "Zoë".into(),
+        line: Some(session.stamp_line("Reçu à Zürich par {name}", "Zoë")),
+    };
+    session.apply(id, edit).unwrap();
+    let saved = session.save_bytes(id).unwrap();
+    let doc = pdfcraft_cos::Document::open(saved).unwrap();
+    const WANT: &[u8] = b"(Re\xe7u \xe0 Z\xfcrich par Zo\xeb)";
+    let found = doc.scan_objects().any(|(_, o)| match o.as_ref() {
+        pdfcraft_cos::Object::Stream(st) => st.decoded().is_ok_and(|b| b.windows(WANT.len()).any(|w| w == WANT)),
+        _ => false,
+    });
+    assert!(found, "the line's letters are WinAnsi bytes in the appearance");
+}
diff --git a/crates/ui-egui/src/canvas.rs b/crates/ui-egui/src/canvas.rs
index 8b280ba75d..10c22eaba1 100644
--- a/crates/ui-egui/src/canvas.rs
+++ b/crates/ui-egui/src/canvas.rs
@@ -845,6 +845,8 @@ struct PageEnv<'a> {
     comments_hidden: bool,
     content_h: f32,
     content_w: f32,
+    /// The custom stamp's line, filled in now (#1741).
+    custom_line: &'a Option<String>,
     custom_stamp: &'a Option<crate::stamps_ui::CustomStamp>,
     date_text: &'a Result<String, String>,
     doc: &'a pdfcraft_engine::Document,
@@ -1110,6 +1112,7 @@ fn page_tool_input(ui: &mut egui::Ui, view: &mut DocView, frame: &mut PageFrame<
         can_fill,
         can_modify,
         comments_hidden,
+        custom_line,
         custom_stamp,
         date_text,
         doc,
@@ -1212,6 +1215,7 @@ fn page_tool_input(ui: &mut egui::Ui, view: &mut DocView, frame: &mut PageFrame<
                 name: cs.name.clone(),
                 file: pdfcraft_engine::MarkFile { name: cs.file.clone(), bytes: cs.data.clone(), page: cs.page },
                 author: author.clone(),
+                line: custom_line.clone(),
             });
             frame.out.stamp_placed = true;
         }
@@ -3149,6 +3153,7 @@ pub fn document_area(app: &mut PdfCraftApp, index: usize, ui: &mut egui::Ui) {
         QuickTool::CustomStamp(i) => app.custom_stamps.get(i).cloned(),
         _ => None,
     };
+    let custom_line = custom_stamp.as_ref().and_then(|cs| cs.line.as_deref()).map(|t| app.session.stamp_line(t, &author));
     let mut open_props: Option<(usize, usize)> = None;
     // The table being set up in its window, shown on its own document's page.
     let table_preview = app.field_table_draft.as_mut().filter(|d| d.doc == view.id).and_then(|d| Some(d.preview(info.pages.get(d.page)?, &form)));
@@ -3187,6 +3192,7 @@ pub fn document_area(app: &mut PdfCraftApp, index: usize, ui: &mut egui::Ui) {
         comments_hidden,
         content_h,
         content_w,
+        custom_line: &custom_line,
         custom_stamp: &custom_stamp,
         date_text: &date_text,
         doc,
diff --git a/crates/ui-egui/src/i18n/ar.tsv b/crates/ui-egui/src/i18n/ar.tsv
index 56f62b7734..00592becd3 100644
--- a/crates/ui-egui/src/i18n/ar.tsv
+++ b/crates/ui-egui/src/i18n/ar.tsv
@@ -800,6 +800,8 @@
 	initials	أحرف أولى
 	signature	توقيع
 	Create Custom Stamp	إنشاء ختم مخصص
+	Add a line filled in when the stamp is placed	إضافة سطر يُملأ عند وضع الختم
+	{name}, {date} and {time} become your name, the date and the time.	‏{name} و{date} و{time} تصبح اسمك والتاريخ والوقت.
 	From {file}	من {file}
 	Category:	الفئة:
 	e.g. My stamps	مثلًا: أختامي
diff --git a/crates/ui-egui/src/i18n/bg.tsv b/crates/ui-egui/src/i18n/bg.tsv
index ceccdf9582..ac1db8523f 100644
--- a/crates/ui-egui/src/i18n/bg.tsv
+++ b/crates/ui-egui/src/i18n/bg.tsv
@@ -463,6 +463,8 @@
 	initials	инициали
 	signature	подпис
 	Create Custom Stamp	Създаване на персонализиран печат
+	Add a line filled in when the stamp is placed	Добавяне на ред, попълван при поставяне на печата
+	{name}, {date} and {time} become your name, the date and the time.	{name}, {date} и {time} стават вашето име, датата и часът.
 	From {file}	От {file}
 	Category:	Категория:
 	e.g. My stamps	напр. Моите печати
diff --git a/crates/ui-egui/src/i18n/cs.tsv b/crates/ui-egui/src/i18n/cs.tsv
index 8bfde72a85..62815c8469 100644
--- a/crates/ui-egui/src/i18n/cs.tsv
+++ b/crates/ui-egui/src/i18n/cs.tsv
@@ -880,6 +880,8 @@ key	Space	Mezerník
 	initials	iniciály
 	signature	podpis
 	Create Custom Stamp	Vytvořit vlastní razítko
+	Add a line filled in when the stamp is placed	Přidat řádek vyplněný při umístění razítka
+	{name}, {date} and {time} become your name, the date and the time.	{name}, {date} a {time} se nahradí vaším jménem, datem a časem.
 	From {file}	Ze souboru {file}
 	Category:	Kategorie:
 	e.g. My stamps	např. Moje razítka
diff --git a/crates/ui-egui/src/i18n/de.tsv b/crates/ui-egui/src/i18n/de.tsv
index 83684c08ea..951a724987 100644
--- a/crates/ui-egui/src/i18n/de.tsv
+++ b/crates/ui-egui/src/i18n/de.tsv
@@ -778,6 +778,8 @@
 	initials	Initialen
 	signature	Unterschrift
 	Create Custom Stamp	Eigenen Stempel erstellen
+	Add a line filled in when the stamp is placed	Eine Zeile hinzufügen, die beim Platzieren des Stempels ausgefüllt wird
+	{name}, {date} and {time} become your name, the date and the time.	{name}, {date} und {time} werden zu Ihrem Namen, dem Datum und der Uhrzeit.
 	From {file}	Aus {file}
 	Category:	Kategorie:
 	e.g. My stamps	z. B. Meine Stempel
diff --git a/crates/ui-egui/src/i18n/el.tsv b/crates/ui-egui/src/i18n/el.tsv
index 576cdfcd6d..2880446454 100644
--- a/crates/ui-egui/src/i18n/el.tsv
+++ b/crates/ui-egui/src/i18n/el.tsv
@@ -2090,6 +2090,8 @@
 	initials	μονογραφή
 	signature	υπογραφή
 	Create Custom Stamp	Δημιουργία προσαρμοσμένης σφραγίδας
+	Add a line filled in when the stamp is placed	Προσθήκη γραμμής που συμπληρώνεται όταν τοποθετείται η σφραγίδα
+	{name}, {date} and {time} become your name, the date and the time.	Τα {name}, {date} και {time} γίνονται το όνομά σας, η ημερομηνία και η ώρα.
 	From {file}	Από το {file}
 	Category:	Κατηγορία:
 	e.g. My stamps	π.χ. Οι σφραγίδες μου
diff --git a/crates/ui-egui/src/i18n/es.tsv b/crates/ui-egui/src/i18n/es.tsv
index 3216e4e448..bd26a3a43a 100644
--- a/crates/ui-egui/src/i18n/es.tsv
+++ b/crates/ui-egui/src/i18n/es.tsv
@@ -794,6 +794,8 @@
 	initials	iniciales
 	signature	firma
 	Create Custom Stamp	Crear sello personalizado
+	Add a line filled in when the stamp is placed	Añadir una línea que se rellena al colocar el sello
+	{name}, {date} and {time} become your name, the date and the time.	{name}, {date} y {time} se convierten en su nombre, la fecha y la hora.
 	From {file}	De {file}
 	Category:	Categoría:
 	e.g. My stamps	p. ej., Mis sellos
diff --git a/crates/ui-egui/src/i18n/fr.tsv b/crates/ui-egui/src/i18n/fr.tsv
index 6092231df3..b01e0b694a 100644
--- a/crates/ui-egui/src/i18n/fr.tsv
+++ b/crates/ui-egui/src/i18n/fr.tsv
@@ -774,6 +774,8 @@
 	initials	initiales
 	signature	signature
 	Create Custom Stamp	Créer un tampon personnalisé
+	Add a line filled in when the stamp is placed	Ajouter une ligne remplie au moment de poser le tampon
+	{name}, {date} and {time} become your name, the date and the time.	{name}, {date} et {time} deviennent votre nom, la date et l’heure.
 	From {file}	Depuis {file}
 	Category:	Catégorie :
 	e.g. My stamps	p. ex. Mes tampons
diff --git a/crates/ui-egui/src/i18n/hu.tsv b/crates/ui-egui/src/i18n/hu.tsv
index 53b81062bb..5c068bf8ce 100644
--- a/crates/ui-egui/src/i18n/hu.tsv
+++ b/crates/ui-egui/src/i18n/hu.tsv
@@ -771,6 +771,8 @@
 	initials	monogram
 	signature	aláírás
 	Create Custom Stamp	Egyéni bélyegző létrehozása
+	Add a line filled in when the stamp is placed	A bélyegző elhelyezésekor kitöltött sor hozzáadása
+	{name}, {date} and {time} become your name, the date and the time.	A {name}, a {date} és a {time} helyére a neve, a dátum és az időpont kerül.
 	From {file}	Ebből: {file}
 	Category:	Kategória:
 	e.g. My stamps	pl. Saját bélyegzők
diff --git a/crates/ui-egui/src/i18n/it.tsv b/crates/ui-egui/src/i18n/it.tsv
index a3dc999d6d..3e1e8d94d5 100644
--- a/crates/ui-egui/src/i18n/it.tsv
+++ b/crates/ui-egui/src/i18n/it.tsv
@@ -797,6 +797,8 @@
 	initials	iniziali
 	signature	firma
 	Create Custom Stamp	Crea timbro personalizzato
+	Add a line filled in when the stamp is placed	Aggiungi una riga compilata quando il timbro viene posizionato
+	{name}, {date} and {time} become your name, the date and the time.	{name}, {date} e {time} diventano il tuo nome, la data e l’ora.
 	From {file}	Da {file}
 	Category:	Categoria:
 	e.g. My stamps	es. I miei timbri
diff --git a/crates/ui-egui/src/i18n/ja.tsv b/crates/ui-egui/src/i18n/ja.tsv
index 5e64a1a8ce..94f1971e97 100644
--- a/crates/ui-egui/src/i18n/ja.tsv
+++ b/crates/ui-egui/src/i18n/ja.tsv
@@ -801,6 +801,8 @@
 	initials	イニシャル
 	signature	署名
 	Create Custom Stamp	カスタムスタンプを作成
+	Add a line filled in when the stamp is placed	スタンプを配置したときに埋められる行を追加
+	{name}, {date} and {time} become your name, the date and the time.	{name}、{date}、{time} はあなたの名前、日付、時刻になります。
 	From {file}	元ファイル: {file}
 	Category:	カテゴリ:
 	e.g. My stamps	例: マイスタンプ
diff --git a/crates/ui-egui/src/i18n/kk.tsv b/crates/ui-egui/src/i18n/kk.tsv
index 5c8e594759..b09316c0d9 100644
--- a/crates/ui-egui/src/i18n/kk.tsv
+++ b/crates/ui-egui/src/i18n/kk.tsv
@@ -757,6 +757,8 @@
 	initials	инициалдар
 	signature	қолтаңба
 	Create Custom Stamp	Өзіндік мөр жасау
+	Add a line filled in when the stamp is placed	Мөр қойылғанда толтырылатын жол қосу
+	{name}, {date} and {time} become your name, the date and the time.	{name}, {date} және {time} сіздің атыңызға, күнге және уақытқа айналады.
 	From {file}	{file} файлынан
 	Category:	Санаты:
 	e.g. My stamps	мысалы, Менің мөрлерім
diff --git a/crates/ui-egui/src/i18n/lt.tsv b/crates/ui-egui/src/i18n/lt.tsv
index 61fd9dc9a2..83200b06c4 100644
--- a/crates/ui-egui/src/i18n/lt.tsv
+++ b/crates/ui-egui/src/i18n/lt.tsv
@@ -413,6 +413,8 @@
 	Counterclockwise 90 degrees	90 laipsnių prieš laikrodžio rodyklę
 	Country/Region	Šalis / regionas
 	Create Custom Stamp	Kurti pasirinktinį antspaudą
+	Add a line filled in when the stamp is placed	Pridėti eilutę, užpildomą uždedant spaudą
+	{name}, {date} and {time} become your name, the date and the time.	{name}, {date} ir {time} tampa jūsų vardu, data ir laiku.
 	Create Link	Kurti saitą
 	Create PDF Comment Summary	Kurti PDF komentarų suvestinę
 	Create PDF comment summary…	Kurti PDF komentarų suvestinę…
diff --git a/crates/ui-egui/src/i18n/pl.tsv b/crates/ui-egui/src/i18n/pl.tsv
index 203cad58d8..6c67d19e39 100644
--- a/crates/ui-egui/src/i18n/pl.tsv
+++ b/crates/ui-egui/src/i18n/pl.tsv
@@ -793,6 +793,8 @@
 	initials	inicjały
 	signature	podpis
 	Create Custom Stamp	Utwórz własny stempel
+	Add a line filled in when the stamp is placed	Dodaj wiersz wypełniany przy umieszczaniu stempla
+	{name}, {date} and {time} become your name, the date and the time.	{name}, {date} i {time} zostaną zastąpione Twoim imieniem, datą i godziną.
 	From {file}	Z {file}
 	Category:	Kategoria:
 	e.g. My stamps	np. Moje stemple
diff --git a/crates/ui-egui/src/i18n/pt-br.tsv b/crates/ui-egui/src/i18n/pt-br.tsv
index 45f827171b..d7897ebf91 100644
--- a/crates/ui-egui/src/i18n/pt-br.tsv
+++ b/crates/ui-egui/src/i18n/pt-br.tsv
@@ -418,6 +418,8 @@
 	initials	iniciais
 	signature	assinatura
 	Create Custom Stamp	Criar carimbo personalizado
+	Add a line filled in when the stamp is placed	Adicionar uma linha preenchida quando o carimbo for colocado
+	{name}, {date} and {time} become your name, the date and the time.	{name}, {date} e {time} se tornam seu nome, a data e a hora.
 	From {file}	De {file}
 	Category:	Categoria:
 	e.g. My stamps	ex.: Meus carimbos
diff --git a/crates/ui-egui/src/i18n/ru.tsv b/crates/ui-egui/src/i18n/ru.tsv
index 59c483526a..8e4f6ed31f 100644
--- a/crates/ui-egui/src/i18n/ru.tsv
+++ b/crates/ui-egui/src/i18n/ru.tsv
@@ -794,6 +794,8 @@
 	initials	инициалы
 	signature	подпись
 	Create Custom Stamp	Создать свой штамп
+	Add a line filled in when the stamp is placed	Добавить строку, заполняемую при размещении штампа
+	{name}, {date} and {time} become your name, the date and the time.	{name}, {date} и {time} заменяются вашим именем, датой и временем.
 	From {file}	Из {file}
 	Category:	Категория:
 	e.g. My stamps	например, Мои штампы
diff --git a/crates/ui-egui/src/i18n/sl.tsv b/crates/ui-egui/src/i18n/sl.tsv
index 83cb594158..0e85b93af5 100644
--- a/crates/ui-egui/src/i18n/sl.tsv
+++ b/crates/ui-egui/src/i18n/sl.tsv
@@ -484,6 +484,8 @@
 	Country/Region	Država/regija
 	Create	Ustvari
 	Create Custom Stamp	Ustvari lasten žig
+	Add a line filled in when the stamp is placed	Dodaj vrstico, ki se izpolni ob postavitvi žiga
+	{name}, {date} and {time} become your name, the date and the time.	{name}, {date} in {time} postanejo vaše ime, datum in čas.
 	Create Link	Ustvari povezavo
 	Create PDF Comment Summary	Ustvari povzetek komentarjev PDF
 	Create PDF comment summary…	Ustvari povzetek komentarjev PDF…
diff --git a/crates/ui-egui/src/i18n/te.tsv b/crates/ui-egui/src/i18n/te.tsv
index 0bb56f4793..0f6813c975 100644
--- a/crates/ui-egui/src/i18n/te.tsv
+++ b/crates/ui-egui/src/i18n/te.tsv
@@ -775,6 +775,8 @@ comment menu	Edit	సవరించు
 	initials	పొడి అక్షరాలు
 	signature	సంతకం
 	Create Custom Stamp	అనుకూల స్టాంప్‌ను సృష్టించు
+	Add a line filled in when the stamp is placed	స్టాంప్ ఉంచినప్పుడు నింపబడే పంక్తిని జోడించండి
+	{name}, {date} and {time} become your name, the date and the time.	{name}, {date} మరియు {time} మీ పేరు, తేదీ మరియు సమయంగా మారతాయి.
 	From {file}	{file} నుండి
 	Category:	వర్గం:
 	e.g. My stamps	ఉదా. నా స్టాంప్‌లు
diff --git a/crates/ui-egui/src/i18n/tr.tsv b/crates/ui-egui/src/i18n/tr.tsv
index b52688606b..04594d55f1 100644
--- a/crates/ui-egui/src/i18n/tr.tsv
+++ b/crates/ui-egui/src/i18n/tr.tsv
@@ -756,6 +756,8 @@
 	initials	paraf
 	signature	imza
 	Create Custom Stamp	Özel Damga Oluştur
+	Add a line filled in when the stamp is placed	Damga yerleştirildiğinde doldurulan bir satır ekle
+	{name}, {date} and {time} become your name, the date and the time.	{name}, {date} ve {time} adınız, tarih ve saat olur.
 	From {file}	{file} dosyasından
 	Category:	Kategori:
 	e.g. My stamps	ör. Damgalarım
diff --git a/crates/ui-egui/src/i18n/uk.tsv b/crates/ui-egui/src/i18n/uk.tsv
index dc65faf7a2..dea4558114 100644
--- a/crates/ui-egui/src/i18n/uk.tsv
+++ b/crates/ui-egui/src/i18n/uk.tsv
@@ -798,6 +798,8 @@
 	initials	ініціали
 	signature	підпис
 	Create Custom Stamp	Створити власний штамп
+	Add a line filled in when the stamp is placed	Додати рядок, що заповнюється під час розміщення штампа
+	{name}, {date} and {time} become your name, the date and the time.	{name}, {date} і {time} стають вашим ім’ям, датою та часом.
 	From {file}	Із {file}
 	Category:	Категорія:
 	e.g. My stamps	наприклад Мої штампи
diff --git a/crates/ui-egui/src/i18n/zh-hans.tsv b/crates/ui-egui/src/i18n/zh-hans.tsv
index 5f08576b8e..9df1035ac3 100644
--- a/crates/ui-egui/src/i18n/zh-hans.tsv
+++ b/crates/ui-egui/src/i18n/zh-hans.tsv
@@ -469,6 +469,8 @@
 	initials	姓名首字母
 	signature	签名
 	Create Custom Stamp	创建自定义图章
+	Add a line filled in when the stamp is placed	添加一行，在放置图章时填入
+	{name}, {date} and {time} become your name, the date and the time.	{name}、{date} 和 {time} 会变成你的姓名、日期和时间。
 	From {file}	来自 {file}
 	Category:	类别：
 	e.g. My stamps	例如：我的图章
diff --git a/crates/ui-egui/src/i18n/zh-hant.tsv b/crates/ui-egui/src/i18n/zh-hant.tsv
index 2570f12f1c..d019b5a373 100644
--- a/crates/ui-egui/src/i18n/zh-hant.tsv
+++ b/crates/ui-egui/src/i18n/zh-hant.tsv
@@ -422,6 +422,9 @@
 	initials	姓名首字母
 	signature	簽名
 	Create Custom Stamp	建立自訂戳記
+	Create Custom Stamp	建立自定義戳記
+	Add a line filled in when the stamp is placed	新增一行，在放置圖章時填入
+	{name}, {date} and {time} become your name, the date and the time.	{name}、{date} 和 {time} 會變成你的姓名、日期與時間。
 	From {file}	來自 {file}
 	Category:	類別：
 	e.g. My stamps	例如：我的戳記
diff --git a/crates/ui-egui/src/tools/stamps_ui.rs b/crates/ui-egui/src/tools/stamps_ui.rs
index 9cddb31d23..ba520fe257 100644
--- a/crates/ui-egui/src/tools/stamps_ui.rs
+++ b/crates/ui-egui/src/tools/stamps_ui.rs
@@ -23,8 +23,15 @@ pub struct CustomStamp {
     pub page: usize,
     #[serde(with = "b64")]
     pub data: Arc<Vec<u8>>,
+    /// A line under the picture, filled in when the stamp is placed (#1741): `{name}`,
+    /// `{date}` and `{time}` become the author and now.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub line: Option<String>,
 }
 
+/// The line a new dynamic custom stamp offers: what the built-in dynamic stamps write.
+pub const DEFAULT_LINE: &str = "By {name} at {time}, {date}";
+
 mod b64 {
     use std::sync::Arc;
 
@@ -48,6 +55,9 @@ pub struct StampDraft {
     pub data: Arc<Vec<u8>>,
     pub category: String,
     pub name: String,
+    /// Add a line filled in when the stamp is placed, and its template.
+    pub dynamic: bool,
+    pub line: String,
 }
 
 pub(crate) fn create_body(ui: &mut egui::Ui, app: &mut PdfCraftApp, t: &Tokens) -> (bool, bool) {
@@ -81,8 +91,15 @@ pub(crate) fn create_body(ui: &mut egui::Ui, app: &mut PdfCraftApp, t: &Tokens)
         ui.add(crate::widgets::line(&mut d.name).desired_width(200.0)).labelled_by(l.id);
         ui.end_row();
     });
+    ui.add_space(8.0);
+    // A dynamic stamp (#1741): a line under the picture, filled in when it is placed.
+    ui.add(widgets::checkbox(&mut d.dynamic, tl!("Add a line filled in when the stamp is placed")));
+    if d.dynamic {
+        ui.add(crate::widgets::line(&mut d.line).desired_width(320.0).char_limit(pdfcraft_engine::MAX_STAMP_LINE));
+        ui.label(egui::RichText::new(tl!("{name}, {date} and {time} become your name, the date and the time.")).small().color(t.text_muted));
+    }
     ui.add_space(12.0);
-    let ok = !d.category.trim().is_empty() && !d.name.trim().is_empty();
+    let ok = !d.category.trim().is_empty() && !d.name.trim().is_empty() && (!d.dynamic || !d.line.trim().is_empty());
     let (mut save, mut cancel) = (false, false);
     ui.with_layout(Layout::right_to_left(Align::Center), |ui| {
         if ui.add_enabled_ui(ok, |ui| widgets::pill_button(ui, tl!("OK"), true)).inner.clicked() {
@@ -163,14 +180,22 @@ impl PdfCraftApp {
         }
         let name = file.rsplit_once('.').map_or(file.as_str(), |(s, _)| s).to_string();
         let category = self.custom_stamps.last().map(|s| s.category.clone()).unwrap_or_else(|| "My stamps".into());
-        self.stamp_draft = crate::stamps_ui::StampDraft { file, data: Arc::new(bytes), category, name };
+        self.stamp_draft = crate::stamps_ui::StampDraft { file, data: Arc::new(bytes), category, name, dynamic: false, line: DEFAULT_LINE.into() };
         self.dialog = Some(Dialog::CreateStamp);
     }
 
     /// Save the dialog's stamp in the library and choose it.
     pub(crate) fn save_custom_stamp(&mut self) {
         let d = std::mem::take(&mut self.stamp_draft);
-        self.custom_stamps.push(CustomStamp { category: d.category.trim().into(), name: d.name.trim().into(), file: d.file, page: 0, data: d.data });
+        let line = d.dynamic.then(|| d.line.trim().to_string()).filter(|l| !l.is_empty());
+        self.custom_stamps.push(CustomStamp {
+            category: d.category.trim().into(),
+            name: d.name.trim().into(),
+            file: d.file,
+            page: 0,
+            data: d.data,
+            line,
+        });
         self.quick_tool = QuickTool::CustomStamp(self.custom_stamps.len() - 1);
     }
 }
diff --git a/crates/ui-egui/tests/it/stamps.rs b/crates/ui-egui/tests/it/stamps.rs
index 767cc7eb4c..c161488778 100644
--- a/crates/ui-egui/tests/it/stamps.rs
+++ b/crates/ui-egui/tests/it/stamps.rs
@@ -140,3 +140,49 @@ fn creating_placing_and_keeping_custom_stamps() {
     assert_eq!((again.custom_stamps[0].category.as_str(), again.custom_stamps[0].name.as_str()), ("Company", "logo"));
     assert_eq!(again.custom_stamps[0].data, s.custom_stamps[0].data);
 }
+
+/// A custom stamp with a line filled in when it is placed (#1741): chosen in the Create dialog,
+/// kept in the library, and placed with the band under the picture.
+#[test]
+fn a_dynamic_custom_stamp_keeps_its_line_and_fills_it_in_when_placed() {
+    let mut h = Harness::builder().with_size(egui::vec2(1400.0, 900.0)).build_eframe(|_cc| {
+        let mut app = PdfCraftApp::new();
+        app.set_option("language", "en").unwrap();
+        app.open_bytes("form.pdf", None, include_bytes!("../data/form.pdf").to_vec()).unwrap();
+        app.set_option("zoom", "150").unwrap();
+        app.set_option("author", "Ada").unwrap();
+        app
+    });
+    h.run_steps(6);
+    assert!(h.state_mut().execute("comment.stamp"));
+    h.run_steps(2);
+    let mut png = Vec::new();
+    image::RgbImage::from_pixel(60, 20, image::Rgb([20, 120, 220])).write_to(&mut std::io::Cursor::new(&mut png), image::ImageFormat::Png).unwrap();
+    h.state_mut().start_custom_stamp("logo.png".into(), png);
+    h.run_steps(2);
+    h.get_by_label("Add a line filled in when the stamp is placed").click();
+    h.run_steps(2);
+    h.get_by_label_contains("become your name, the date and the time");
+    h.get_by_label("OK").click();
+    h.run_steps(2);
+    assert_eq!(h.state().custom_stamps[0].line.as_deref(), Some("By {name} at {time}, {date}"));
+    let p = {
+        let r = h.state().views[0].page_screen_rect(0).unwrap();
+        r.min + egui::vec2(r.width() * 0.5, r.height() * 0.85)
+    };
+    h.hover_at(p);
+    h.run_steps(1);
+    h.drag_at(p);
+    h.run_steps(1);
+    h.drop_at(p);
+    h.run_steps(4);
+    let s = h.state();
+    let doc = s.session.get(s.views[0].id).unwrap();
+    let r = doc.info.annotations.iter().find(|a| a.subtype == "Stamp").expect("placed").rect;
+    let aspect = (r[2] - r[0]) / (r[3] - r[1]);
+    // A band under the 3:1 picture (so less wide than 3:1), at least as wide as the picture.
+    assert!(aspect > 3.0 * (1.0 - 0.22) - 0.05 && aspect < 3.0 - 0.05, "a band under the 3:1 picture: {r:?}");
+    let mut again = PdfCraftApp::new();
+    again.restore(&s.persist());
+    assert_eq!(again.custom_stamps[0].line, s.custom_stamps[0].line, "kept with the library");
+}
diff --git a/parity/acrobat-features.toml b/parity/acrobat-features.toml
index 0b6f658dd6..f8aab00584 100644
--- a/parity/acrobat-features.toml
+++ b/parity/acrobat-features.toml
@@ -4195,8 +4195,8 @@ milestone = "M6"
 status = "shipped"
 commands = ["comment.stamp"]
 tools = ["comment_add"]
-evidence = ["crates/annot/src/tests.rs::stamps_draw_their_label_and_by_line", "crates/ui-egui/tests/it/stamps.rs::choosing_and_placing_stamps", "crates/automation/tests/it/automation.rs::stamps_through_tools", "crates/engine/src/tests.rs::rubber_stamps_point_left_as_displayed_on_rotated_pages"]
-notes = "Approved, Confidential, Received, Reviewed, Revised with a By author at time, date line (local time). The label is turned with the page's /Rotate so it reads upright as displayed (#1398)"
+evidence = ["crates/annot/src/tests.rs::stamps_draw_their_label_and_by_line", "crates/ui-egui/tests/it/stamps.rs::choosing_and_placing_stamps", "crates/automation/tests/it/automation.rs::stamps_through_tools", "crates/engine/src/tests.rs::rubber_stamps_point_left_as_displayed_on_rotated_pages", "crates/engine/src/tests.rs::stamp_lines_fill_in_the_name_date_and_time", "crates/automation/tests/it/automation.rs::a_custom_stamp_line_is_filled_in_when_placed", "crates/ui-egui/tests/it/stamps.rs::a_dynamic_custom_stamp_keeps_its_line_and_fills_it_in_when_placed"]
+notes = "Approved, Confidential, Received, Reviewed, Revised with a By author at time, date line (local time). The label is turned with the page's /Rotate so it reads upright as displayed (#1398). A custom stamp (image or PDF page) can carry a line under its picture, a template with {name}, {date} and {time} filled in when it is placed and fixed afterwards (#1741; Create Custom Stamp, and stamp_custom's line). Not yet: Acrobat's dynamic stamps from PDF stamp files with form fields and JavaScript, date formats other than the built-in one, and text outside WinAnsi in the line (drawn in Helvetica, so it shows as ?)"
 
 [[feature]]
 id = "comment.stamps-custom"