diff --git a/Cargo.lock b/Cargo.lock
index d3cd5a6d4f..584c0a1125 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4173,6 +4173,14 @@ dependencies = [
  "unicase",
 ]
 
+[[package]]
+name = "mimetypes"
+version = "0.0.1"
+dependencies = [
+ "errors",
+ "infer 0.11.0",
+]
+
 [[package]]
 name = "minidom"
 version = "0.15.0"
diff --git a/Cargo.toml b/Cargo.toml
index f9f834f51f..5a32ab2c75 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -35,6 +35,7 @@ members = [
   "crates/lib/idempotency",
   "crates/lib/jobs_common",
   "crates/lib/media",
+  "crates/lib/mimetypes",
   "crates/lib/mysql_queries",
   "crates/lib/redis_common",
   "crates/lib/sqlite_queries",
diff --git a/crates/lib/mimetypes/Cargo.toml b/crates/lib/mimetypes/Cargo.toml
new file mode 100644
index 0000000000..d4d1cde116
--- /dev/null
+++ b/crates/lib/mimetypes/Cargo.toml
@@ -0,0 +1,24 @@
+[package]
+name = "mimetypes"
+edition = "2018"
+version = "0.0.1"
+authors = [
+    "Brandon Thomas <bt@brand.io>",
+    "Brandon Thomas <echelon@gmail.com>",
+]
+publish = false
+
+[lib]
+# NB: Public "mimetypes" crate does not exist, so it's safe to use for now.
+name = "mimetypes"
+path = "src/lib.rs"
+
+[dependencies]
+# Internal
+errors = { path = "../../lib/errors" }
+
+# External
+infer = "0.11" # Mimetype detection
+
+[dev-dependencies]
+# None yet
diff --git a/crates/lib/mimetypes/src/lib.rs b/crates/lib/mimetypes/src/lib.rs
new file mode 100644
index 0000000000..bdb9492625
--- /dev/null
+++ b/crates/lib/mimetypes/src/lib.rs
@@ -0,0 +1,22 @@
+//! mimetypes
+//!
+//! The purpose of this library is to perform mimetype detection routines on files, raw bytes,
+//! streams, etc.
+//!
+
+// Never allow these
+#![forbid(private_in_public)]
+#![forbid(unused_must_use)] // NB: It's unsafe to not close/check some things
+
+// Okay to toggle
+#![forbid(unreachable_patterns)]
+#![forbid(unused_imports)]
+#![forbid(unused_mut)]
+#![forbid(unused_variables)]
+
+// Always allow
+#![allow(dead_code)]
+#![allow(non_snake_case)]
+
+pub mod mimetype_for_bytes;
+pub mod mimetype_for_file;
diff --git a/crates/lib/mimetypes/src/mimetype_for_bytes.rs b/crates/lib/mimetypes/src/mimetype_for_bytes.rs
new file mode 100644
index 0000000000..b71ab972d5
--- /dev/null
+++ b/crates/lib/mimetypes/src/mimetype_for_bytes.rs
@@ -0,0 +1,41 @@
+
+const DEFAULT_BINARY_MIMETYPE : &'static str = "application/octet-stream";
+
+pub fn get_mimetype_for_bytes(bytes: &[u8]) -> Option<&'static str> {
+  infer::get(bytes)
+      .map(|typ| typ.mime_type())
+}
+
+pub fn get_mimetype_for_bytes_or_default(bytes: &[u8]) -> &'static str {
+  infer::get(bytes)
+      .map(|typ| typ.mime_type())
+      .unwrap_or(DEFAULT_BINARY_MIMETYPE)
+}
+
+#[cfg(test)]
+mod tests {
+  use crate::mimetype_for_bytes::{get_mimetype_for_bytes, get_mimetype_for_bytes_or_default};
+
+  #[test]
+  fn test_mimetype_png() {
+    // NB: From "Hanashi Mask.png"
+    let bytes : Vec<u8> = vec![
+      137, 80, 78, 71, 13, 10, 26, 10,
+      0, 0, 0, 13, 73, 72, 68, 82,
+      0, 0, 20, 193, 0, 0, 15, 239,
+      8, 6, 0, 0, 0, 163, 131, 119,
+      122, 0, 0, 0,
+    ];
+
+    assert_eq!(get_mimetype_for_bytes(&bytes), Some("image/png"));
+    assert_eq!(get_mimetype_for_bytes_or_default(&bytes), "image/png");
+  }
+
+  #[test]
+  fn test_mimetype_unknown() {
+    let bytes : Vec<u8> = vec![];
+
+    assert_eq!(get_mimetype_for_bytes(&bytes), None);
+    assert_eq!(get_mimetype_for_bytes_or_default(&bytes), "application/octet-stream");
+  }
+}
diff --git a/crates/lib/mimetypes/src/mimetype_for_file.rs b/crates/lib/mimetypes/src/mimetype_for_file.rs
new file mode 100644
index 0000000000..79c39374b0
--- /dev/null
+++ b/crates/lib/mimetypes/src/mimetype_for_file.rs
@@ -0,0 +1,43 @@
+use std::path::Path;
+
+const DEFAULT_BINARY_MIMETYPE : &'static str = "application/octet-stream";
+
+pub fn get_mimetype_for_file<P: AsRef<Path>>(file: P) -> std::io::Result<Option<&'static str>> {
+  infer::get_from_path(file)
+      .map(|maybe_type| maybe_type.map(|typ| typ.mime_type()))
+}
+
+pub fn get_mimetype_for_file_or_default<P: AsRef<Path>>(file: P) -> std::io::Result<&'static str> {
+  get_mimetype_for_file(file)
+      .map(|maybe_type| match maybe_type {
+        Some(mimetype) => mimetype,
+        None => DEFAULT_BINARY_MIMETYPE,
+      })
+}
+
+#[cfg(test)]
+mod tests {
+  use std::path::PathBuf;
+  use crate::mimetype_for_file::get_mimetype_for_file;
+
+  fn test_file(path_from_repo_root: &str) -> PathBuf {
+    // https://doc.rust-lang.org/cargo/reference/environment-variables.html
+    let mut path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
+    path.push(format!("../../../{}", path_from_repo_root));
+    path
+  }
+
+  #[test]
+  fn test_mimetype_mp3() {
+    let path = test_file("test_data/audio/mp3/super_mario_rpg_beware_the_forests_mushrooms.mp3");
+
+    assert_eq!(get_mimetype_for_file(&path).unwrap(), Some("audio/mpeg"));
+  }
+
+  #[test]
+  fn test_mimetype_unknown() {
+    let path = test_file("test_data/video/mp4/golden_sun_garoh.mp4");
+
+    assert_eq!(get_mimetype_for_file(&path).unwrap(), Some("video/mp4"));
+  }
+}
diff --git a/crates/service/web/storyteller_web/src/http_server/endpoints/media_uploads/upload_media.rs b/crates/service/web/storyteller_web/src/http_server/endpoints/media_uploads/upload_media.rs
index 5b0f3e8038..efae782004 100644
--- a/crates/service/web/storyteller_web/src/http_server/endpoints/media_uploads/upload_media.rs
+++ b/crates/service/web/storyteller_web/src/http_server/endpoints/media_uploads/upload_media.rs
@@ -14,8 +14,6 @@ use crate::http_server::web_utils::response_error_helpers::to_simple_json_error;
 use crate::server_state::ServerState;
 use crate::validations::model_uploads::validate_model_title;
 use crate::validations::validate_idempotency_token_format::validate_idempotency_token_format;
-use mysql_queries::payloads::media_upload_modification_details::MediaUploadModificationDetails;
-use mysql_queries::queries::media_uploads::insert_media_upload::{Args, insert_media_upload};
 use enums::by_table::media_uploads::media_upload_type::MediaUploadType;
 use enums::common::visibility::Visibility;
 use files::hash::hash_bytes_sha2;
@@ -24,6 +22,9 @@ use http_server_common::request::get_request_ip::get_request_ip;
 use http_server_common::response::serialize_as_json_error::serialize_as_json_error;
 use log::{info, warn, log, error};
 use media::decode_basic_audio_info::decode_basic_audio_info;
+use mysql_queries::payloads::media_upload_modification_details::MediaUploadModificationDetails;
+use mysql_queries::queries::media_uploads::get_media_upload_by_uuid::{get_media_upload_by_uuid, get_media_upload_by_uuid_with_connection};
+use mysql_queries::queries::media_uploads::insert_media_upload::{Args, insert_media_upload};
 use regex::Regex;
 use sqlx::error::DatabaseError;
 use sqlx::error::Error::Database;
@@ -35,7 +36,6 @@ use symphonia::core::formats::FormatOptions;
 use symphonia::core::io::{MediaSourceStream, ReadOnlySource};
 use symphonia::core::meta::MetadataOptions;
 use symphonia::core::probe::Hint;
-use mysql_queries::queries::media_uploads::get_media_upload_by_uuid::{get_media_upload_by_uuid, get_media_upload_by_uuid_with_connection};
 use tokens::files::media_upload::MediaUploadToken;
 
 #[derive(Serialize)]