diff --git a/ROADMAP.md b/ROADMAP.md
index ec17b71..77743c7 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -16,7 +16,7 @@ DesignCraft aims at full Adobe InDesign parity — and to be better: faster, ope
 - Tables (M8): tables anchored in stories (header/footer/body rows, merged cells, per-edge strokes, fills + alternating fills, insets, vertical justification, at-least/exact row heights); composed into the text column (columns scale to fit, rows break across columns/frames with repeating headers/footers, overset); rendered, exported to PDF (real text) and IDML (export + import); Table menu, Table panel, Create Table dialog, caret/typing/Tab navigation and cell selection in cells; `table.*` commands.
 - Hyperlinks (text or frames → URL / e-mail / page) and bookmarks, exported as PDF link annotations and outline.
 - EPUB 3 (reflowable) export: stories in reading order, CSS from paragraph/character styles, images, navigation (`file.exportEpub`, CLI `--export x.epub`).
-- Data Merge (CSV or JSON rows, `<<Field>>` placeholders), spell checking (public-domain Moby list + document dictionary, suggestions), Step and Repeat (count or grid), snippets, object styles, Numbering & Section Options.
+- Data Merge (one linked CSV, TSV, text, or Excel file; text, image, QR, and hyperlink placeholders; preview; a new document with one record per page or records tiled on a single page), spell checking (public-domain Moby list + document dictionary, suggestions), Step and Repeat (count or grid), snippets, object styles, Numbering & Section Options.
 - Footnotes: Type › Insert Footnote (caret moves into the note), Document Footnote Options (numbering style incl. symbols, start/restart per page/spread/section, prefix/suffix, reference position/character style, paragraph style, separator, spacing, first baseline, rule above); notes composed at the bottom of the referencing column with the body text making room; edited in place on the canvas; rendered, exported to PDF (real text) and IDML (InDesign's structure, verified opening in InDesign 2026) and imported from IDML; `footnote.*` commands.
 - Cross-references and text anchors: Insert Cross-Reference (paragraph by style, or text anchor), 11 formats with InDesign's building blocks (full/partial paragraph, paragraph text/number, page number, anchor name, chapter, file name) plus user formats; resolved live at composition — never out of date, no Update step; unresolved destinations show `??`; PDF link annotations to the destination page; IDML export/import as InDesign cross-reference sources, hyperlinks, text destinations and formats (verified in InDesign 2026); `xref.*` / `anchor.*` commands.
 - Index: page references (topic from the selection or up to 4 levels, sort keys; current page, to end of story, next n paragraphs, suppressed, See / See also), Generate / Update Index (section headings, nested or run-in, page ranges merged, Index Title / Section Head / Level 1–4 styles); IDML export/import as InDesign topics, page references and topic cross-references (verified in InDesign 2026); `index.*` commands.
@@ -208,7 +208,7 @@ same references), and from the app's JSON control channel. See [docs/agents.md](
 | M8 | Tables | ✅ core (table/cell styles, rotation, diagonal lines pending) |
 | M9 | Performance (MT composition, tiles) | in progress (glyph path cache, culling, parallel compose 6.7× faster, perf harness) |
 | M10 | Find/Change, spelling, Preflight | in progress (Find/Change ✅, spelling ✅, Preflight) |
-| M11 | Layout power features (liquid/alternate layouts, data merge) | started (data merge, step & repeat, snippets) |
+| M11 | Layout power features (liquid/alternate layouts, data merge) | started (data merge phase 1, step & repeat, snippets) |
 | M12 | Interactive & digital (EPUB, HTML, interactive PDF) | started (EPUB, PDF links/bookmarks) |
 | M13 | Automation (scripts, batch) | |
 | M14 | 1.0 polish & packaging | |
diff --git a/apps/designcraft/src/main.rs b/apps/designcraft/src/main.rs
index 2fb3a1f..101a5f5 100644
--- a/apps/designcraft/src/main.rs
+++ b/apps/designcraft/src/main.rs
@@ -89,65 +89,78 @@ fn save_prefs(app: &DesignApp) {
     }
 }
 
+/// One file-type row in an open dialog. `open_filters` is what `pick_open` applies.
+struct OpenFilter {
+    name: &'static str,
+    extensions: &'static [&'static str],
+}
+
+fn open_filters(purpose: &str) -> &'static [OpenFilter] {
+    match purpose {
+        "swatches" => &[OpenFilter { name: "Swatch Exchange (ASE)", extensions: &["ase"] }],
+        "script" => &[OpenFilter { name: "Script", extensions: &["dcscript", "txt", "json"] }],
+        "icc" => &[OpenFilter { name: "ICC profile", extensions: &["icc", "icm"] }],
+        "book" => &[OpenFilter { name: "Book", extensions: &["dcbook"] }],
+        "xml" => &[OpenFilter { name: "XML", extensions: &["xml"] }],
+        "library" => &[OpenFilter { name: "Object Library", extensions: &["dclib"] }],
+        "dataMerge" => &[OpenFilter { name: "Data source (CSV, TSV, text, Excel)", extensions: &["csv", "tsv", "tab", "txt", "xlsx"] }],
+        "place" => &[
+            OpenFilter {
+                name: "Graphics and text",
+                extensions: &[
+                    "png",
+                    "jpg",
+                    "jpeg",
+                    "gif",
+                    "webp",
+                    "tif",
+                    "tiff",
+                    "bmp",
+                    "psd",
+                    "svg",
+                    "pdf",
+                    "ai",
+                    "eps",
+                    "txt",
+                    "docx",
+                    "rtf",
+                    "md",
+                    "xlsx",
+                    "idml",
+                    "designcraft",
+                    "mp4",
+                    "m4v",
+                    "mov",
+                    "webm",
+                    "mp3",
+                    "m4a",
+                    "wav",
+                    "ogg",
+                ],
+            },
+            OpenFilter {
+                name: "Graphics",
+                extensions: &["png", "jpg", "jpeg", "gif", "webp", "tif", "tiff", "bmp", "psd", "svg", "pdf", "ai", "eps"],
+            },
+            OpenFilter { name: "Text (Word, RTF, plain, Excel)", extensions: &["docx", "rtf", "txt", "md", "xlsx"] },
+            OpenFilter { name: "Video and sound", extensions: &["mp4", "m4v", "mov", "webm", "mp3", "m4a", "wav", "ogg"] },
+        ],
+        _ => &[
+            OpenFilter { name: "DesignCraft or IDML", extensions: &["designcraft", "idml"] },
+            OpenFilter { name: "DesignCraft", extensions: &["designcraft"] },
+            OpenFilter { name: "InDesign Markup (IDML)", extensions: &["idml"] },
+        ],
+    }
+}
+
 fn services() -> Services {
     Services {
         pick_open: Some(Box::new(|purpose: &str| {
-            let d = rfd::FileDialog::new();
-            let d = if purpose == "swatches" {
-                d.add_filter("Swatch Exchange (ASE)", &["ase"])
-            } else if purpose == "script" {
-                d.add_filter("Script", &["dcscript", "txt", "json"])
-            } else if purpose == "icc" {
-                d.add_filter("ICC profile", &["icc", "icm"])
-            } else if purpose == "book" {
-                d.add_filter("Book", &["dcbook"])
-            } else if purpose == "xml" {
-                d.add_filter("XML", &["xml"])
-            } else if purpose == "library" {
-                d.add_filter("Object Library", &["dclib"])
-            } else if purpose == "place" {
-                d.add_filter(
-                    "Graphics and text",
-                    &[
-                        "png",
-                        "jpg",
-                        "jpeg",
-                        "gif",
-                        "webp",
-                        "tif",
-                        "tiff",
-                        "bmp",
-                        "psd",
-                        "svg",
-                        "pdf",
-                        "ai",
-                        "eps",
-                        "txt",
-                        "docx",
-                        "rtf",
-                        "md",
-                        "xlsx",
-                        "idml",
-                        "designcraft",
-                        "mp4",
-                        "m4v",
-                        "mov",
-                        "webm",
-                        "mp3",
-                        "m4a",
-                        "wav",
-                        "ogg",
-                    ],
-                )
-                .add_filter("Graphics", &["png", "jpg", "jpeg", "gif", "webp", "tif", "tiff", "bmp", "psd", "svg", "pdf", "ai", "eps"])
-                .add_filter("Text (Word, RTF, plain, Excel)", &["docx", "rtf", "txt", "md", "xlsx"])
-                .add_filter("Video and sound", &["mp4", "m4v", "mov", "webm", "mp3", "m4a", "wav", "ogg"])
-            } else {
-                d.add_filter("DesignCraft or IDML", &["designcraft", "idml"])
-                    .add_filter("DesignCraft", &["designcraft"])
-                    .add_filter("InDesign Markup (IDML)", &["idml"])
-            };
-            d.pick_file().map(|p| p.to_string_lossy().to_string())
+            let mut dialog = rfd::FileDialog::new();
+            for filter in open_filters(purpose) {
+                dialog = dialog.add_filter(filter.name, filter.extensions);
+            }
+            dialog.pick_file().map(|p| p.to_string_lossy().to_string())
         })),
         pick_save: Some(Box::new(|name: &str| rfd::FileDialog::new().set_file_name(name).save_file().map(|p| p.to_string_lossy().to_string()))),
         read: Some(Box::new(|p: &str| std::fs::read(p).map_err(|e| e.to_string()))),
@@ -244,3 +257,21 @@ fn main() -> eframe::Result {
         }),
     )
 }
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn data_merge_open_dialog_lists_table_extensions() {
+        let filters = super::open_filters("dataMerge");
+        let exts: Vec<&str> = filters.iter().flat_map(|filter| filter.extensions.iter().copied()).collect();
+        for ext in ["csv", "tsv", "tab", "txt", "xlsx"] {
+            assert!(exts.contains(&ext), "{ext} is missing from the dataMerge dialog: {exts:?}");
+        }
+        assert!(!exts.iter().any(|ext| *ext == "designcraft" || *ext == "idml"), "dataMerge must not fall through to the document filters: {exts:?}");
+        let place = super::open_filters("place");
+        assert!(place.len() > 1, "the place dialog keeps a filter for each kind of file");
+        assert!(place.iter().any(|filter| filter.extensions.contains(&"png")));
+        let documents = super::open_filters("");
+        assert!(documents.iter().any(|filter| filter.extensions.contains(&"designcraft")));
+    }
+}
diff --git a/crates/ui-egui/src/dock.rs b/crates/ui-egui/src/dock.rs
index 9b43557..fdf20e6 100644
--- a/crates/ui-egui/src/dock.rs
+++ b/crates/ui-egui/src/dock.rs
@@ -45,6 +45,7 @@ pub const ICON_PANELS: &[(&str, &str, &str)] = &[
     ("transitions", "Page Transitions", "panel-pages"),
     ("trackChanges", "Track Changes", "panel-articles"),
     ("scripts", "Scripts", "panel-library"),
+    ("dataMerge", "Data Merge", "panel-datamerge"),
 ];
 
 pub fn show(app: &mut DesignApp, ui: &mut egui::Ui) {
@@ -200,6 +201,7 @@ pub fn panel_body(app: &mut DesignApp, ui: &mut egui::Ui, id: &str) {
         "transitions" => panels::interactive::transitions(app, ui),
         "trackChanges" => panels::interactive::track_changes(app, ui),
         "scripts" => panels::library::scripts(app, ui),
+        "dataMerge" => panels::datamerge::show(app, ui),
         "table" => panels::table::show(app, ui),
         _ => panels::properties::info_panel(app, ui),
     }
diff --git a/crates/ui-egui/src/i18n.rs b/crates/ui-egui/src/i18n.rs
index 60fae75..56a60c3 100644
--- a/crates/ui-egui/src/i18n.rs
+++ b/crates/ui-egui/src/i18n.rs
@@ -770,7 +770,13 @@ const TABLE: &[(&str, [&str; 5])] = &[
     ("Create Frame", ["Create Frame", "Create Frame", "Create Frame", "Create Frame", "创建框架"]),
     (
         "Create Merged Document…",
-        ["Create Merged Document…", "Create Merged Document…", "Create Merged Document…", "Create Merged Document…", "创建合并文档…"],
+        [
+            "Zusammengeführtes Dokument erstellen …",
+            "Créer un document fusionné…",
+            "Crear documento combinado…",
+            "結合ドキュメントを作成…",
+            "创建合并文档…",
+        ],
     ),
     (
         "Cross-Reference Formats",
@@ -2619,6 +2625,54 @@ const TABLE: &[(&str, [&str; 5])] = &[
             "文档中的字体：{count}    缺失：{missing}",
         ],
     ),
+    ("No data source", ["Keine Datenquelle", "Aucune source de données", "No hay fuente de datos", "データソースがありません", "没有数据源"]),
+    (
+        "Select Data Source…",
+        ["Datenquelle auswählen …", "Choisir une source de données…", "Seleccionar fuente de datos…", "データソースを選択…", "选择数据源…"],
+    ),
+    ("Data Merge", ["Datenzusammenführung", "Fusion de données", "Combinación de datos", "データ結合", "数据合并"]),
+    ("Preview", ["Vorschau", "Aperçu", "Previsualización", "プレビュー", "预览"]),
+    ("Previous", ["Zurück", "Précédent", "Anterior", "前へ", "上一条"]),
+    ("Next", ["Weiter", "Suivant", "Siguiente", "次へ", "下一条"]),
+    ("Record", ["Datensatz", "Enregistrement", "Registro", "レコード", "记录"]),
+    ("Merge options", ["Optionen für die Zusammenführung", "Options de fusion", "Opciones de combinación", "結合オプション", "合并选项"]),
+    ("All records", ["Alle Datensätze", "Tous les enregistrements", "Todos los registros", "すべてのレコード", "全部记录"]),
+    ("One record", ["Ein Datensatz", "Un enregistrement", "Un registro", "1件のレコード", "一条记录"]),
+    ("Range", ["Bereich", "Plage", "Intervalo", "範囲", "范围"]),
+    ("Records per page", ["Datensätze pro Seite", "Enregistrements par page", "Registros por página", "ページあたりのレコード", "每页记录数"]),
+    ("Single record", ["Einzelner Datensatz", "Un seul enregistrement", "Un solo registro", "単一レコード", "单条记录"]),
+    ("Multiple records", ["Mehrere Datensätze", "Plusieurs enregistrements", "Varios registros", "複数レコード", "多条记录"]),
+    ("Rows first", ["Zeilen zuerst", "Lignes d'abord", "Filas primero", "行を優先", "先行后列"]),
+    ("Columns first", ["Spalten zuerst", "Colonnes d'abord", "Columnas primero", "列を優先", "先列后行"]),
+    ("Column spacing", ["Spaltenabstand", "Espacement des colonnes", "Espacio entre columnas", "列の間隔", "列间距"]),
+    ("Row spacing", ["Zeilenabstand", "Espacement des lignes", "Espacio entre filas", "行の間隔", "行间距"]),
+    (
+        "Fit proportionally",
+        ["Proportional einpassen", "Ajuster proportionnellement", "Encajar proporcionalmente", "縦横比を保持して合わせる", "按比例适合"],
+    ),
+    (
+        "Fill proportionally",
+        ["Proportional füllen", "Remplir proportionnellement", "Llenar proporcionalmente", "縦横比を保持して塗りつぶす", "按比例填充"],
+    ),
+    (
+        "Fit content to frame",
+        ["Inhalt an Rahmen anpassen", "Ajuster le contenu au bloc", "Ajustar el contenido al marco", "内容をフレームに合わせる", "内容适合框架"],
+    ),
+    ("Center in frame", ["Im Rahmen zentrieren", "Centrer dans le bloc", "Centrar en el marco", "フレーム内で中央", "在框架中居中"]),
+    ("Link images", ["Bilder verknüpfen", "Lier les images", "Vincular imágenes", "画像をリンク", "链接图像"]),
+    ("Limit", ["Obergrenze", "Limite", "Límite", "上限", "上限"]),
+    ("Bind to frame", ["An Rahmen binden", "Lier au bloc", "Vincular al marco", "フレームにバインド", "绑定到框架"]),
+    ("Insert field", ["Feld einfügen", "Insérer le champ", "Insertar campo", "フィールドを挿入", "插入字段"]),
+    (
+        "Pass csv, rows, or bytes from the control channel.",
+        [
+            "csv, rows oder bytes über den Steuerkanal übergeben.",
+            "Transmettez csv, rows ou bytes par le canal de contrôle.",
+            "Pase csv, rows o bytes por el canal de control.",
+            "制御チャネルから csv、rows または bytes を渡します。",
+            "请通过控制通道传入 csv、rows 或 bytes。",
+        ],
+    ),
 ];
 
 /// Interface direction; independent of document binding and paragraph direction.
diff --git a/crates/ui-egui/src/icons.rs b/crates/ui-egui/src/icons.rs
index 00169d4..ce7cb75 100644
--- a/crates/ui-egui/src/icons.rs
+++ b/crates/ui-egui/src/icons.rs
@@ -762,6 +762,14 @@ pub fn paint(p: &Painter, r: Rect, name: &str, c: Color32) {
         }
         "format-container" => pen.rect(4.0, 4.0, 16.0, 16.0),
         "format-text" => pen.text(10.0, 10.5, "T", 15.0),
+        "panel-datamerge" => {
+            pen.w = 1.2;
+            pen.rect(3.0, 2.0, 17.0, 18.0);
+            pen.line(&[(3.0, 6.0), (17.0, 6.0)]);
+            pen.line(&[(6.5, 10.0), (8.5, 13.5), (6.5, 13.5)]);
+            pen.line(&[(13.5, 10.0), (11.5, 13.5), (13.5, 13.5)]);
+            pen.line(&[(9.2, 15.0), (11.0, 9.0)]);
+        }
         "screen-mode" => {
             pen.rect(3.0, 4.0, 17.0, 16.0);
             pen.line(&[(3.0, 7.0), (17.0, 7.0)]);
diff --git a/crates/ui-egui/src/menus.rs b/crates/ui-egui/src/menus.rs
index c7b9f19..48da69d 100644
--- a/crates/ui-egui/src/menus.rs
+++ b/crates/ui-egui/src/menus.rs
@@ -648,7 +648,7 @@ pub const MENUS: &[(&str, &[&str])] = &[
             "ui:window.panel|Book|{\"panel\": \"book\"}",
             "<",
             ">Utilities",
-            "cmd:data.merge",
+            "ui:window.panel|Data Merge|{\"panel\":\"dataMerge\"}",
             "<",
             ">Output",
             "ui:window.panel|Attributes|{\"panel\": \"attributes\"}",
diff --git a/crates/ui-egui/src/panels/datamerge.rs b/crates/ui-egui/src/panels/datamerge.rs
new file mode 100644
index 0000000..f0ae772
--- /dev/null
+++ b/crates/ui-egui/src/panels/datamerge.rs
@@ -0,0 +1,234 @@
+//! Data Merge panel. It reads the linked source and calls commands. Opening the panel does not merge.
+
+use egui::{Color32, Sense, Stroke, vec2};
+use serde_json::{Value, json};
+
+use crate::DesignApp;
+use crate::theme::{Tokens, semibold};
+
+pub fn show(app: &mut DesignApp, ui: &mut egui::Ui) {
+    let t = Tokens::get(ui.ctx());
+    let lang = app.ui.language.clone();
+    let snapshot = app.session.active().map(|st| {
+        let source = st.doc.data_merge.sources.first();
+        (source.map(|s| s.name.clone()), source.map(|s| s.rows.len()).unwrap_or(0), st.doc.data_merge.options.clone(), st.preview_record.unwrap_or(0))
+    });
+    let Some((source_name, record_count, options, preview_record)) = snapshot else {
+        dim(ui, &t, &lang, "No data source");
+        return;
+    };
+    let fields = app.session.execute("data.fields", &json!({})).ok().and_then(|v| v.as_array().cloned()).unwrap_or_default();
+
+    ui.horizontal(|ui| {
+        let label = source_name.clone().unwrap_or_else(|| tr(&lang, "No data source").to_string());
+        let color = if source_name.is_some() { t.text_strong } else { t.text_dim };
+        crate::rtl::label(ui, egui::RichText::new(label).color(color));
+    });
+    ui.horizontal(|ui| {
+        if ui.button(w(ui, &lang, "Select Data Source…")).clicked() {
+            select_source(app);
+        }
+        let has_source = source_name.is_some();
+        if ui.add_enabled(has_source, egui::Button::new(w(ui, &lang, "Update"))).clicked() {
+            let _ = app.run("data.source.update", json!({}));
+        }
+        if ui.add_enabled(has_source, egui::Button::new(w(ui, &lang, "Remove"))).clicked() {
+            let _ = app.run("data.source.remove", json!({}));
+        }
+    });
+    ui.separator();
+
+    if fields.is_empty() {
+        dim(ui, &t, &lang, "Pass csv, rows, or bytes from the control channel.");
+    }
+    for field in &fields {
+        let name = field["name"].as_str().unwrap_or("").to_string();
+        let kind = field["kind"].as_str().unwrap_or("text").to_string();
+        let uses = field["uses"].as_u64().unwrap_or(0);
+        ui.horizontal(|ui| {
+            kind_icon(ui, &kind, t.icon);
+            crate::rtl::label(ui, egui::RichText::new(name.clone()).color(t.text));
+            crate::rtl::label(ui, egui::RichText::new(uses.to_string()).size(11.0).color(t.text_dim));
+            let bind = kind == "image" || kind == "qr";
+            let caption = if bind { "Bind to frame" } else { "Insert field" };
+            if ui.small_button(w(ui, &lang, caption)).clicked() {
+                let params = if bind { json!({"field": name}) } else { json!({"field": name, "role": "text"}) };
+                let _ = app.run("data.placeholder.add", params);
+            }
+        });
+    }
+    ui.separator();
+
+    let mut preview_on = preview_record > 0;
+    if ui.checkbox(&mut preview_on, w(ui, &lang, "Preview")).changed() {
+        if preview_on {
+            let _ = app.run("data.preview", json!({"record": 1}));
+        } else {
+            let _ = app.run("data.preview.stop", json!({}));
+        }
+    }
+    let max_record = (record_count as u32).max(1);
+    let shown = if preview_record == 0 { 1 } else { preview_record.min(max_record) };
+    let mut jump = None;
+    ui.add_enabled_ui(preview_record > 0, |ui| {
+        ui.horizontal(|ui| {
+            if ui.small_button(w(ui, &lang, "First")).clicked() {
+                jump = Some(1);
+            }
+            if ui.small_button(w(ui, &lang, "Previous")).clicked() {
+                jump = Some(shown.saturating_sub(1).max(1));
+            }
+            let mut rec = shown;
+            if ui.add(egui::DragValue::new(&mut rec).range(1..=max_record)).changed() {
+                jump = Some(rec);
+            }
+            crate::rtl::label(ui, egui::RichText::new(tr(&lang, "Record")).color(t.text));
+            if ui.small_button(w(ui, &lang, "Next")).clicked() {
+                jump = Some(shown.saturating_add(1).min(max_record));
+            }
+            if ui.small_button(w(ui, &lang, "Last")).clicked() {
+                jump = Some(max_record);
+            }
+        });
+    });
+    if let Some(rec) = jump.filter(|rec| *rec != preview_record) {
+        let _ = app.run("data.preview", json!({"record": rec}));
+    }
+    ui.separator();
+
+    crate::rtl::label(ui, egui::RichText::new(tr(&lang, "Merge options")).strong().color(t.text_strong));
+    if let Some(records) = choice(ui, "dm_records", &options.records, &[("all", "All records"), ("one", "One record"), ("range", "Range")], &lang) {
+        let _ = app.run("data.options", json!({"records": records}));
+    }
+    if options.records == "one" {
+        let mut one = options.one.max(1);
+        if ui.add(egui::DragValue::new(&mut one).range(1..=max_record).prefix(format!("{} ", tr(&lang, "Record")))).changed() {
+            let _ = app.run("data.options", json!({"one": one}));
+        }
+    }
+    if options.records == "range" {
+        let mut range = options.range.clone();
+        if ui.text_edit_singleline(&mut range).changed() {
+            let _ = app.run("data.options", json!({"range": range}));
+        }
+    }
+    crate::rtl::label(ui, egui::RichText::new(tr(&lang, "Records per page")).color(t.text));
+    if let Some(per_page) = choice(ui, "dm_per_page", &options.per_page, &[("single", "Single record"), ("multiple", "Multiple records")], &lang) {
+        let _ = app.run("data.options", json!({"perPage": per_page}));
+    }
+    if options.per_page == "multiple" {
+        if let Some(arrange) = choice(ui, "dm_arrange", &options.arrange, &[("rows", "Rows first"), ("columns", "Columns first")], &lang) {
+            let _ = app.run("data.options", json!({"arrange": arrange}));
+        }
+        let labels = ["Top", "Right", "Bottom", "Left"];
+        let mut insets = options.insets;
+        let mut insets_changed = false;
+        for (i, label) in labels.iter().enumerate() {
+            ui.horizontal(|ui| {
+                crate::rtl::label(ui, egui::RichText::new(tr(&lang, label)).color(t.text));
+                if ui.add(egui::DragValue::new(&mut insets[i]).speed(1.0)).changed() {
+                    insets_changed = true;
+                }
+            });
+        }
+        if insets_changed {
+            let _ = app.run("data.options", json!({"insets": insets}));
+        }
+        let mut column_spacing = options.column_spacing;
+        if ui.add(egui::DragValue::new(&mut column_spacing).speed(1.0).prefix(format!("{} ", tr(&lang, "Column spacing")))).changed() {
+            let _ = app.run("data.options", json!({"columnSpacing": column_spacing}));
+        }
+        let mut row_spacing = options.row_spacing;
+        if ui.add(egui::DragValue::new(&mut row_spacing).speed(1.0).prefix(format!("{} ", tr(&lang, "Row spacing")))).changed() {
+            let _ = app.run("data.options", json!({"rowSpacing": row_spacing}));
+        }
+    }
+    if let Some(fitting) = choice(
+        ui,
+        "dm_fitting",
+        &options.fitting,
+        &[
+            ("fitProportionally", "Fit proportionally"),
+            ("fillProportionally", "Fill proportionally"),
+            ("fitContentToFrame", "Fit content to frame"),
+            ("none", "None"),
+        ],
+        &lang,
+    ) {
+        let _ = app.run("data.options", json!({"fitting": fitting}));
+    }
+    let mut center = options.center;
+    if ui.checkbox(&mut center, w(ui, &lang, "Center in frame")).changed() {
+        let _ = app.run("data.options", json!({"center": center}));
+    }
+    let mut link_images = options.link_images;
+    if ui.checkbox(&mut link_images, w(ui, &lang, "Link images")).changed() {
+        let _ = app.run("data.options", json!({"linkImages": link_images}));
+    }
+    let mut limit = options.limit.unwrap_or(0);
+    if ui.add(egui::DragValue::new(&mut limit).range(0..=100_000).prefix(format!("{} ", tr(&lang, "Limit")))).changed() {
+        let value = if limit == 0 { Value::Null } else { json!(limit) };
+        let _ = app.run("data.options", json!({"limit": value}));
+    }
+    ui.add_space(6.0);
+    if ui.button(w(ui, &lang, "Create Merged Document…")).clicked() {
+        let _ = app.run("data.merge", json!({}));
+    }
+}
+
+fn select_source(app: &mut DesignApp) {
+    let Some(path) = app.services.pick_open.as_mut().and_then(|f| f("dataMerge")) else {
+        app.status(tr(&app.ui.language, "Pass csv, rows, or bytes from the control channel."));
+        return;
+    };
+    let _ = app.run("data.source.select", json!({"path": path}));
+}
+
+fn choice(ui: &mut egui::Ui, id: &str, current: &str, options: &[(&str, &str)], lang: &str) -> Option<String> {
+    let label = options.iter().find(|(value, _)| *value == current).map(|(_, text)| tr(lang, text)).unwrap_or(current);
+    let mut picked = None;
+    egui::ComboBox::from_id_salt(id).selected_text(label).width(ui.available_width().min(200.0)).show_ui(ui, |ui| {
+        for (value, text) in options {
+            if ui.selectable_label(*value == current, tr(lang, text)).clicked() {
+                picked = Some((*value).to_string());
+            }
+        }
+    });
+    picked.filter(|value| value != current)
+}
+
+fn kind_icon(ui: &mut egui::Ui, kind: &str, color: Color32) {
+    let (rect, _) = ui.allocate_exact_size(vec2(16.0, 16.0), Sense::hover());
+    let painter = ui.painter();
+    match kind {
+        "image" => {
+            painter.rect_stroke(rect.shrink(1.5), 1.0, Stroke::new(1.0, color), egui::StrokeKind::Middle);
+            painter.circle_stroke(rect.center() + vec2(-3.0, -2.0), 1.5, Stroke::new(1.0, color));
+            let base = rect.left_bottom() + vec2(2.0, -3.0);
+            painter.line_segment([base, rect.center() + vec2(-1.0, 2.0)], Stroke::new(1.0, color));
+            painter.line_segment([rect.center() + vec2(-1.0, 2.0), rect.right_bottom() + vec2(-2.0, -5.0)], Stroke::new(1.0, color));
+        }
+        "qr" => {
+            let origin = rect.min + vec2(2.0, 2.0);
+            for (x, y) in [(0, 0), (2, 0), (0, 2), (2, 2), (1, 1)] {
+                let at = origin + vec2(x as f32 * 4.0, y as f32 * 4.0);
+                painter.rect_filled(egui::Rect::from_min_size(at, vec2(3.0, 3.0)), 0.0, color);
+            }
+        }
+        _ => {
+            painter.text(rect.center(), egui::Align2::CENTER_CENTER, "T", semibold(13.0), color);
+        }
+    }
+}
+
+fn dim(ui: &mut egui::Ui, t: &Tokens, lang: &str, key: &str) {
+    crate::rtl::label(ui, egui::RichText::new(tr(lang, key)).size(11.0).color(t.text_dim));
+}
+
+fn tr<'a>(lang: &str, s: &'a str) -> &'a str {
+    crate::i18n::tr(lang, s)
+}
+
+fn w(ui: &egui::Ui, lang: &str, s: &str) -> egui::WidgetText {
+    crate::rtl::widget(ui, tr(lang, s))
+}
diff --git a/crates/ui-egui/src/panels/mod.rs b/crates/ui-egui/src/panels/mod.rs
index 0ef1256..1b382d5 100644
--- a/crates/ui-egui/src/panels/mod.rs
+++ b/crates/ui-egui/src/panels/mod.rs
@@ -1,6 +1,7 @@
 //! Panels and shared panel helpers.
 
 pub mod conditions;
+pub mod datamerge;
 pub mod glyphs;
 pub mod interactive;
 pub mod layers;