diff --git a/ROADMAP.md b/ROADMAP.md
index 541a56e5d..963bc5960 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -358,6 +358,7 @@ list) · [roadmap.md](docs/roadmap.md) (milestones, plan) · [parity-checklist.m
 
 Newest first.
 
+- **2026-10-24** · Renaming a paragraph or character style, or moving it into a style group, keeps its Export Tagging under the new name, and undo puts it back under the old one. Deleting a tagged style drops its tagging and leaves the replacement style's own tagging as it was. No readiness percentage change.
 - **2026-10-24** · Quick Apply and the application bar's search leave out the interface commands that failed or reset a setting when chosen there: those that need a workspace, a command and shortcut, a menu item, a panel, a window edge, an app page, a recent file or a swatch they can't give them, a Contextual Task Bar place, and Interface Color Theme, UI Scaling, Reset Shortcuts, the flattener preset, Screen Mode and Zoom To, which without a value switched to the dark theme, set 100%, cleared every custom shortcut or the preset, or went to Normal mode or 100% zoom. Each stays in the menu, panel or dialog that gives it the value. No readiness percentage change.
 - **2026-10-24** · EPUB Export Options › Split Document, a dialog before File › Export EPUB… saves (`document.epubSplit`, stored with the document): off, a single paragraph style, or based on paragraph style export tags, with Paragraph Style Options › Export Tagging's Split Document flag marking those styles. A reflowable EPUB is one content file unless Split Document is on; the split before each top-level h1 from #791 is gone. A split before a list item or preformatted line no longer leaves an unclosed list or block in a content file. IDML import and export keep the setting and the flag, and Load Styles the flag. No readiness percentage change.
 - **2026-10-18** · Repeated placed-PDF layer variants are prepared once per asset and hidden-name set, with recovery warnings retained. All-visible named layers keep their original source bytes, including PDFs whose cross-reference tables the reader repairs, in plain, PDF/X-4, booklet and book-merge output. Layer changes that require writing still reject an unusable cross-reference table with a file-named damage error; the first placement error is retained (#906). No readiness percentage change.
diff --git a/crates/engine/src/cmd/style.rs b/crates/engine/src/cmd/style.rs
index 9568d842e..5d440a5d4 100644
--- a/crates/engine/src/cmd/style.rs
+++ b/crates/engine/src/cmd/style.rs
@@ -258,7 +258,7 @@ pub fn specs() -> Vec<CommandSpec> {
                 if !exists {
                     return Err(bad("style.exportTag", format!("no style `{name}`")));
                 }
-                let key = format!("{}:{name}", if character { "c" } else { "p" });
+                let key = export_tag_key(!character, &name);
                 let (tag, class) = (str_param(p, "tag").map(str::to_string), str_param(p, "class").map(str::to_string));
                 let split = p.get("split").and_then(Value::as_bool);
                 if character && split == Some(true) {
@@ -941,7 +941,7 @@ fn edit_para(s: &mut Session, p: &Value) -> Result<Value> {
     let name = str_param(p, "name").ok_or_else(|| bad("style.paragraph.edit", "missing name"))?.to_string();
     let chars: CharAttrs = attrs("style.paragraph.edit", "chars", p, |a: &mut CharAttrs, k, v| a.set_json(k, v))?;
     super::text::validate_char_fill(&s.doc()?.doc, &chars, "style.paragraph.edit")?;
-    let rename = str_param(p, "rename").map(str::to_string);
+    let rename = str_param(p, "rename").map(str::trim).filter(|n| *n != name).map(str::to_string);
     let based = p.get("basedOn").cloned();
     s.edit(|d, _| {
         if let Some(Value::String(b)) = &based
@@ -949,6 +949,14 @@ fn edit_para(s: &mut Session, p: &Value) -> Result<Value> {
         {
             return Err(bad("style.paragraph.edit", "based-on would create a cycle"));
         }
+        if let Some(n) = &rename {
+            if n.is_empty() || n.starts_with('[') {
+                return Err(bad("style.paragraph.edit", format!("can't rename to `{n}`")));
+            }
+            if d.styles.para(n).is_some() {
+                return Err(bad("style.paragraph.edit", format!("a paragraph style named `{n}` already exists")));
+            }
+        }
         // A rule object changes only the rule fields it names, over the style's resolved rule.
         let (current, _) = d.styles.resolve_para_style(&name);
         let mut para: ParaAttrs = attrs("style.paragraph.edit", "para", p, |a: &mut ParaAttrs, k, v| a.set_json_over(k, v, &current))?;
@@ -971,24 +979,35 @@ fn edit_para(s: &mut Session, p: &Value) -> Result<Value> {
     })
 }
 
-/// Rename a paragraph or character style everywhere it's used.
+/// Rename a paragraph or character style everywhere it's used; its Export Tagging follows.
 fn rename_style(d: &mut designcraft_doc::Document, para: bool, from: &str, to: &str) {
+    let st = d.styles_mut();
     if para {
-        for s in &mut d.styles_mut().paragraph {
+        for s in &mut st.paragraph {
             if s.name == from {
                 s.name = to.to_string();
             }
         }
     } else {
-        for s in &mut d.styles_mut().character {
+        for s in &mut st.character {
             if s.name == from {
                 s.name = to.to_string();
             }
         }
     }
+    // An entry already under `to` belongs to no style (names are unique), so it never survives.
+    st.export_tags.remove(&export_tag_key(para, to));
+    if let Some(tag) = st.export_tags.remove(&export_tag_key(para, from)) {
+        st.export_tags.insert(export_tag_key(para, to), tag);
+    }
     redirect_style_refs(d, para, from, to);
 }
 
+/// The `Styles::export_tags` key of a paragraph (`para`) or character style.
+fn export_tag_key(para: bool, name: &str) -> String {
+    format!("{}:{name}", if para { "p" } else { "c" })
+}
+
 /// Point every reference to style `from` at `to`, except the style's own registry entry (its
 /// `name` field) — shared by renaming (which also updates the entry's name) and deletion (which
 /// instead removes the entry, after its former uses point at the replacement).
@@ -1175,8 +1194,10 @@ fn delete_style(s: &mut Session, p: &Value, para: bool) -> Result<Value> {
         for b in based.into_iter().filter(|b| b.as_deref() == Some(name.as_str())) {
             *b = parent.clone();
         }
+        // The replacement keeps its own Export Tagging.
+        st.export_tags.remove(&export_tag_key(para, &name));
         // Every other use: styles, stories, table cells, nested and GREP styles, notes, defaults.
-        rename_style(d, para, &name, &repl);
+        redirect_style_refs(d, para, &name, &repl);
         ok()
     })
 }
@@ -1230,7 +1251,7 @@ fn edit_char(s: &mut Session, p: &Value) -> Result<Value> {
         .and_then(Value::as_object)
         .map(|o| o.iter().filter(|(_, v)| v.is_null()).map(|(k, _)| k.clone()).collect())
         .unwrap_or_default();
-    let rename = str_param(p, "rename").filter(|n| *n != name).map(|n| n.trim().to_string());
+    let rename = str_param(p, "rename").map(str::trim).filter(|n| *n != name).map(str::to_string);
     let based: Option<Option<String>> = match p.get("basedOn") {
         None => None,
         Some(Value::Null) => Some(None),
@@ -1247,10 +1268,13 @@ fn edit_char(s: &mut Session, p: &Value) -> Result<Value> {
                 return Err(bad("style.character.edit", "based-on would create a cycle"));
             }
         }
-        if let Some(n) = &rename
-            && (n.is_empty() || n.starts_with('[') || d.styles.char_style(n).is_some())
-        {
-            return Err(bad("style.character.edit", format!("can't rename to `{n}`")));
+        if let Some(n) = &rename {
+            if n.is_empty() || n.starts_with('[') {
+                return Err(bad("style.character.edit", format!("can't rename to `{n}`")));
+            }
+            if d.styles.char_style(n).is_some() {
+                return Err(bad("style.character.edit", format!("a character style named `{n}` already exists")));
+            }
         }
         let st = d.styles_mut().char_style_mut(&name).ok_or_else(|| bad("style.character.edit", format!("no character style `{name}`")))?;
         st.chars.merge(&chars);
@@ -2843,6 +2867,78 @@ mod export_tag_tests {
         assert!(text.contains("/S/H1") && text.contains("/S/P"), "structure elements");
         assert!(designcraft_render::pdf_page_count(&pdf) == Some(1));
     }
+
+    #[test]
+    fn export_tagging_follows_a_renamed_style_and_goes_with_a_deleted_one() {
+        let mut s = Session::new();
+        s.execute("file.new", &json!({})).unwrap();
+        s.execute("style.paragraph.create", &json!({"name": "Head"})).unwrap();
+        s.execute("style.paragraph.create", &json!({"name": "Body"})).unwrap();
+        s.execute("style.character.create", &json!({"name": "Term"})).unwrap();
+        s.execute("style.exportTag", &json!({"style": "Head", "tag": "h2", "class": "head"})).unwrap();
+        s.execute("style.exportTag", &json!({"style": "Body", "tag": "p", "class": "body"})).unwrap();
+        s.execute("style.exportTag", &json!({"style": "Term", "character": true, "tag": "em", "class": "term"})).unwrap();
+        let tag = |s: &Session, name: &str, character: bool| {
+            s.doc().unwrap().doc.styles.export_tag(name, character).map(|t| (t.tag.clone(), t.class.clone()))
+        };
+        let pair = |t: &str, c: &str| Some((t.to_string(), c.to_string()));
+        // A rename onto another style's name is refused, so neither tagging is lost.
+        assert!(s.execute("style.paragraph.edit", &json!({"name": "Head", "rename": "Body"})).is_err());
+        assert_eq!((tag(&s, "Head", false), tag(&s, "Body", false)), (pair("h2", "head"), pair("p", "body")));
+
+        s.execute("style.paragraph.edit", &json!({"name": "Head", "rename": "Title"})).unwrap();
+        s.execute("style.character.edit", &json!({"name": "Term", "rename": "Word"})).unwrap();
+        assert_eq!(tag(&s, "Title", false), pair("h2", "head"));
+        assert_eq!(tag(&s, "Head", false), None);
+        assert_eq!(tag(&s, "Word", true), pair("em", "term"));
+        assert_eq!(tag(&s, "Term", true), None);
+        // Moving a style into a group renames it to Group/Name.
+        s.execute("style.group", &json!({"kind": "paragraph", "names": ["Title"], "group": "Heads"})).unwrap();
+        assert_eq!(tag(&s, "Heads/Title", false), pair("h2", "head"));
+        assert_eq!(tag(&s, "Title", false), None);
+
+        for _ in 0..3 {
+            s.execute("edit.undo", &json!({})).unwrap();
+        }
+        assert_eq!(tag(&s, "Head", false), pair("h2", "head"));
+        assert_eq!(tag(&s, "Title", false), None);
+        assert_eq!(tag(&s, "Term", true), pair("em", "term"));
+        assert_eq!(tag(&s, "Word", true), None);
+
+        // Deleting drops the deleted style's tagging; the replacement keeps its own.
+        s.execute("style.paragraph.delete", &json!({"name": "Head", "replaceWith": "Body"})).unwrap();
+        assert_eq!(tag(&s, "Head", false), None);
+        assert_eq!(tag(&s, "Body", false), pair("p", "body"));
+        s.execute("style.character.delete", &json!({"name": "Term"})).unwrap();
+        assert_eq!(tag(&s, "Term", true), None);
+        assert!(s.doc().unwrap().doc.styles.export_tags.keys().all(|k| k == "p:Body"));
+    }
+
+    #[test]
+    fn a_rename_onto_a_taken_name_says_so_and_a_trimmed_rename_drops_a_stale_tag() {
+        let mut s = Session::new();
+        s.execute("file.new", &json!({})).unwrap();
+        for (kind, a, b) in [("paragraph", "Head", "Body"), ("character", "Term", "Word")] {
+            s.execute(&format!("style.{kind}.create"), &json!({"name": a})).unwrap();
+            s.execute(&format!("style.{kind}.create"), &json!({"name": b})).unwrap();
+            let e = s.execute(&format!("style.{kind}.edit"), &json!({"name": a, "rename": b})).unwrap_err().to_string();
+            assert!(e.contains(&format!("a {kind} style named `{b}` already exists")), "{e}");
+            let e = s.execute(&format!("style.{kind}.edit"), &json!({"name": a, "rename": "[None]"})).unwrap_err().to_string();
+            assert!(e.contains("can't rename to `[None]`"), "{e}");
+        }
+        // An entry left under a name no style has doesn't attach to a style renamed onto it.
+        s.edit(|d, _| {
+            d.styles_mut()
+                .export_tags
+                .insert("p:Title".into(), designcraft_doc::ExportTag { tag: "h6".into(), class: "stale".into(), ..Default::default() });
+            Ok(())
+        })
+        .unwrap();
+        s.execute("style.paragraph.edit", &json!({"name": "Head", "rename": "  Title "})).unwrap();
+        let st = &s.doc().unwrap().doc.styles;
+        assert!(st.para("Title").is_some(), "the new name is trimmed");
+        assert_eq!(st.export_tag("Title", false), None);
+    }
 }
 
 #[cfg(test)]
diff --git a/crates/ui-egui/src/dialogs.rs b/crates/ui-egui/src/dialogs.rs
index 9e44501f0..20a0c58c5 100644
--- a/crates/ui-egui/src/dialogs.rs
+++ b/crates/ui-egui/src/dialogs.rs
@@ -3876,9 +3876,9 @@ fn confirm_paragraph_style_options(app: &mut DesignApp, d: &mut Dialog) -> Resul
     }
     let (para, chars) = style_option_maps(d);
     let based = d.s("basedOn");
-    let rename = d.s("rename");
+    let rename = d.s("rename").trim().to_string();
     let (r, style) = if d.b("new") {
-        let mut params = json!({"name": if rename.trim().is_empty() { "Paragraph Style 1" } else { rename.trim() }, "para": para, "chars": chars});
+        let mut params = json!({"name": if rename.is_empty() { "Paragraph Style 1" } else { rename.as_str() }, "para": para, "chars": chars});
         if !based.is_empty() && based != designcraft_doc::NO_PARA_STYLE {
             params["basedOn"] = json!(based);
         }
@@ -3890,11 +3890,17 @@ fn confirm_paragraph_style_options(app: &mut DesignApp, d: &mut Dialog) -> Resul
         if !based.is_empty() {
             params["basedOn"] = if based == designcraft_doc::NO_PARA_STYLE { Value::Null } else { json!(based) };
         }
-        if !rename.is_empty() && rename != name {
+        let renaming = !rename.is_empty() && rename != name;
+        if renaming {
             params["rename"] = json!(rename);
         }
-        let style = if !rename.is_empty() && rename != name { rename } else { name };
-        (app.run("style.paragraph.edit", params)?, style)
+        let r = app.run("style.paragraph.edit", params).inspect_err(|_| {
+            // A refused name is shown next to the name field.
+            if renaming {
+                d.fields.insert("section".into(), json!("general"));
+            }
+        })?;
+        (r, if renaming { rename } else { name })
     };
     // The style now exists under `style`: if a later step fails, the dialog stays open on it and
     // a second OK edits it rather than creating another one.
@@ -7987,6 +7993,26 @@ mod tests {
         draw(&mut app, &ctx);
     }
 
+    #[test]
+    fn paragraph_style_options_show_a_refused_rename_on_general_and_trim_a_new_name() {
+        let (mut app, _) = ruled_paragraph();
+        let ctx = egui::Context::default();
+        app.ui.dialog = Some(Dialog::new("paragraphStyleOptions", json!({"name": "Ruled", "section": "rules"})));
+        draw(&mut app, &ctx);
+        app.ui.dialog.as_mut().unwrap().fields.insert("rename".into(), json!("Ruled Child"));
+        let e = confirm(&mut app).unwrap_err();
+        let d = app.ui.dialog.clone().expect("the dialog stays open");
+        assert_eq!(d.s("section"), "general", "the name field is on General");
+        assert!(d.s("status").contains("already exists"), "{e}");
+
+        app.ui.dialog.as_mut().unwrap().fields.insert("rename".into(), json!("  Fresh "));
+        app.ui.dialog.as_mut().unwrap().fields.insert("x.tag".into(), json!("h3"));
+        confirm(&mut app).unwrap();
+        let st = &app.session.doc().unwrap().doc.styles;
+        assert!(st.para("Fresh").is_some());
+        assert_eq!(st.export_tag("Fresh", false).map(|t| t.tag.as_str()), Some("h3"));
+    }
+
     /// A frame with two paragraphs of [Basic Paragraph]; the first has a local Word Spacing minimum.
     fn two_paragraphs() -> (DesignApp, Value) {
         let mut app = DesignApp::new(designcraft_engine::Session::new(), crate::Services::default());