diff --git a/apps/vectorcraft-cli/src/main.rs b/apps/vectorcraft-cli/src/main.rs
index 9f915f6fc..76b052e2c 100644
--- a/apps/vectorcraft-cli/src/main.rs
+++ b/apps/vectorcraft-cli/src/main.rs
@@ -4,7 +4,7 @@
 //! vectorcraft-cli mcp [--connect 127.0.0.1:7979 | --headless] [--automation-read-root DIR]... [--automation-write-root DIR]...
 //! vectorcraft-cli run [--in FILE] [--cmd id [--params '{json}'] | --commands FILE|-]... [--export out.svg]... [--scale 2]
 //! vectorcraft-cli commands
-//! vectorcraft-cli convert IN OUT [--scale 2] [--artboard 0 | --range 1-3,5] [--outline-text] [--decimals N] [--replace-lossy] [--editing-data] [--ai-version 7|pdf] [--hidden-objects layer|omit|visible] [--transparent-images flatten|omit]
+//! vectorcraft-cli convert IN OUT [--scale 2] [--artboard 0 | --range 1-3,5] [--outline-text] [--decimals N] [--replace-lossy] [--editing-data] [--preserve-editing] [--ai-version 7|pdf] [--hidden-objects layer|omit|visible] [--transparent-images flatten|omit]
 //! vectorcraft-cli info FILE
 //! vectorcraft-cli bench FILE [--size 2880x1800] [--iters 5]
 //! vectorcraft-cli perf [--paths 50000] [--deep]
@@ -90,7 +90,7 @@ USAGE:
   vectorcraft-cli commands
       Print the command catalogue as JSON.
 
-  vectorcraft-cli convert IN OUT [--scale N] [--artboard I | --range R] [--outline-text] [--decimals N] [--replace-lossy] [--editing-data] [--ai-version 7|pdf] [--hidden-objects layer|omit|visible] [--transparent-images flatten|omit]
+  vectorcraft-cli convert IN OUT [--scale N] [--artboard I | --range R] [--outline-text] [--decimals N] [--replace-lossy] [--editing-data] [--preserve-editing] [--ai-version 7|pdf] [--hidden-objects layer|omit|visible] [--transparent-images flatten|omit]
       Open IN (any readable format) and export OUT in the format its extension picks (see Writable
       formats). --scale sizes a raster OUT (pixels per point, default 1); other formats leave it
       out. --artboard is 0-based, --range 1-based (\"1-3,5\"); a PDF gets every artboard
@@ -101,10 +101,12 @@ USAGE:
       SVG's data-* attributes; --outline-text writes SVG text as paths, --decimals sets SVG's coordinate
       precision (1–7, default 3). OUT may not be IN when reading
       IN left things out (hidden text, art or layers it could not read; the notes say which) unless
-      --replace-lossy is given. --editing-data opens a .ai or an EPS with editing data from its editing copy
+      --replace-lossy is given.       --editing-data opens a .ai or an EPS with editing data from its editing copy
       even where that draws differently from its PDF part or page (which can be older), as long as
-      it can be read. The
-      result has the export's warnings, and importWarnings for what reading IN left out.
+      it can be read. A PDF OUT omits the embedded native document unless --preserve-editing is
+      given (Save As PDF in the app still defaults to keeping it). With --preserve-editing the
+      result's warnings say the attachment was written.
+      The result has the export's warnings, and importWarnings for what reading IN left out.
       --ai-version 7 writes a .ai as the legacy version 7 (layers, groups and type kept; one file
       per artboard, OUT-<artboard>.ai when there are several; default pdf, PDF-compatible), with
       --hidden-objects (default layer: a hidden layer above each layer's hidden objects; omit;
@@ -274,8 +276,8 @@ fn convert(args: &[String]) -> Result<(), String> {
         return help();
     }
     let mut files = vec![];
-    let (mut scale, mut artboard, mut range, mut outline_text, mut replace_lossy, mut editing_data) =
-        (1.0f64, None::<u64>, None::<String>, false, false, false);
+    let (mut scale, mut artboard, mut range, mut outline_text, mut replace_lossy, mut editing_data, mut preserve_editing) =
+        (1.0f64, None::<u64>, None::<String>, false, false, false, false);
     let mut decimals = None::<u64>;
     // Legacy `.ai` options, passed on as the export's own (`aiVersion`, `hiddenObjects`,
     // `transparentImages`); the engine checks their values.
@@ -290,6 +292,7 @@ fn convert(args: &[String]) -> Result<(), String> {
             "--decimals" => decimals = Some(it.next().and_then(|v| v.parse::<u64>().ok()).ok_or("--decimals needs a number")?),
             "--replace-lossy" => replace_lossy = true,
             "--editing-data" => editing_data = true,
+            "--preserve-editing" => preserve_editing = true,
             "--ai-version" => legacy.push(("aiVersion", it.next().cloned().ok_or("--ai-version needs 7 or pdf")?)),
             "--hidden-objects" => legacy.push(("hiddenObjects", it.next().cloned().ok_or("--hidden-objects needs layer, omit or visible")?)),
             "--transparent-images" => legacy.push(("transparentImages", it.next().cloned().ok_or("--transparent-images needs flatten or omit")?)),
@@ -319,6 +322,9 @@ fn convert(args: &[String]) -> Result<(), String> {
         if let Some(decimals) = decimals {
             params["decimals"] = json!(decimals);
         }
+        if vectorcraft_engine::cmd::fileio::format_for_name(&output).is_some_and(|f| f.id == "pdf") {
+            params["preserveEditing"] = json!(preserve_editing);
+        }
         ("document.export", params)
     };
     for (key, value) in legacy {
@@ -330,6 +336,24 @@ fn convert(args: &[String]) -> Result<(), String> {
     if let (Some(w), Some(out)) = (opened.get("warnings").filter(|w| w.as_array().is_some_and(|a| !a.is_empty())), r.as_object_mut()) {
         out.insert("importWarnings".into(), w.clone());
     }
+    if preserve_editing
+        && vectorcraft_engine::cmd::fileio::format_for_name(&output).is_some_and(|f| f.id == "pdf")
+        && let Some(obj) = r.as_object_mut()
+    {
+        let path = obj.get("path").and_then(|p| p.as_str()).unwrap_or(&output);
+        const ATTACHMENT: &str = "vectorcraft-editing.vectorcraft";
+        let embedded = std::fs::read(path).is_ok_and(|bytes| bytes.windows(ATTACHMENT.len()).any(|w| w == ATTACHMENT.as_bytes()));
+        if embedded {
+            let note = "The PDF embeds the native VectorCraft document as an attachment (preserveEditing).";
+            if let Some(Value::Array(w)) = obj.get_mut("warnings") {
+                if !w.iter().any(|w| w.as_str() == Some(note)) {
+                    w.push(json!(note));
+                }
+            } else {
+                obj.insert("warnings".into(), json!([note]));
+            }
+        }
+    }
     outln!("{r}");
     Ok(())
 }
diff --git a/apps/vectorcraft-cli/tests/it/fileio.rs b/apps/vectorcraft-cli/tests/it/fileio.rs
index 104aeb0fe..877a68dcc 100644
--- a/apps/vectorcraft-cli/tests/it/fileio.rs
+++ b/apps/vectorcraft-cli/tests/it/fileio.rs
@@ -46,6 +46,26 @@ fn info(file: &str) -> Value {
     serde_json::from_str(&ok(&["info", file])).unwrap()
 }
 
+#[test]
+/// #3627: `convert` to PDF omits the embedded native document unless asked.
+#[test]
+fn convert_pdf_omits_editing_data_unless_preserve_editing() {
+    let pdf = tmp("flyer.pdf");
+    make(&pdf, 120, 80);
+    let plain = tmp("plain.pdf");
+    ok(&["convert", &pdf, &plain]);
+    let bytes = std::fs::read(&plain).unwrap();
+    assert!(!bytes.windows(b"vectorcraft-editing.vectorcraft".len()).any(|w| w == b"vectorcraft-editing.vectorcraft"));
+    let kept = tmp("kept.pdf");
+    let r: Value = serde_json::from_str(&ok(&["convert", &pdf, &kept, "--preserve-editing"])).unwrap();
+    let bytes = std::fs::read(&kept).unwrap();
+    assert!(bytes.windows(b"vectorcraft-editing.vectorcraft".len()).any(|w| w == b"vectorcraft-editing.vectorcraft"), "{r}");
+    assert!(
+        r["warnings"].as_array().is_some_and(|w| w.iter().any(|w| w.as_str().is_some_and(|s| s.contains("preserveEditing")))),
+        "{r}"
+    );
+}
+
 #[test]
 fn convert_pdf_to_svg_and_info_on_ai() {
     let pdf = tmp("in.pdf");