diff --git a/app/templates/documents/detail.html b/app/templates/documents/detail.html
index de782ca..d3339f4 100644
--- a/app/templates/documents/detail.html
+++ b/app/templates/documents/detail.html
@@ -5,6 +5,10 @@
     box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.18) !important;
     font-weight: 800 !important;
   }
+
+body.layout-multi-select-active #layout-word-popover {
+  display: none !important;
+}
 </style>
 
 {% extends "base.html" %}
@@ -1926,6 +1930,9 @@ document.addEventListener("DOMContentLoaded", () => {
       <div class="word-ribbon-group">
         <div class="word-ribbon-row">
           <button type="button" class="layout-tool-btn active" id="layout-tool-select">Select</button>
+            <button type="button" class="layout-tool-btn" id="layout-select-all">Select All</button>
+            <button type="button" class="layout-tool-btn" id="layout-multi-select">Multi</button>
+            <button type="button" class="layout-tool-btn" id="layout-clear-selection">Clear</button>
           <button type="button" class="layout-tool-btn" id="layout-tool-pan">Pan</button>
           <button type="button" class="layout-tool-btn" id="layout-tool-add">Add</button>
           <button type="button" class="layout-tool-btn danger" id="layout-delete-word">Delete</button>
@@ -2504,6 +2511,8 @@ const HANDLE_SIZE_PX = 14;
     const page = pages[0];
     let words = JSON.parse(JSON.stringify(page.words || []));
     let selectedId = null;
+      let selectedIds = new Set();
+      let multiSelectMode = false;
     let tool = "select";
     let zoom = 1;
     let dragState = null;
@@ -3070,7 +3079,7 @@ function refreshSelectionUI(opts = {}) {
         const y2 = bbox[3] * scaleY;
         const w = Math.max(1, x2 - x1);
         const h = Math.max(1, y2 - y1);
-        const selected = String(word.id) === String(selectedId);
+        const selected = selectedIds.has(String(word.id)) || String(word.id) === String(selectedId);
 
         if (showText) {
           drawReplicaText(word, bbox, x1, y1, x2, y2, w, h, scaleX, scaleY);
@@ -3558,6 +3567,7 @@ function refreshSelectionUI(opts = {}) {
         if (popoverEl) popoverEl.style.display = "none";
         canvas.style.cursor = "default";
         refreshSelectionUI({ forceText: true });
+        if (multiSelectMode) hidePopover();
         renderCanvas();
         setStatus("No selection");
         return;
@@ -3727,6 +3737,28 @@ function refreshSelectionUI(opts = {}) {
     document.getElementById("layout-nudge-down")?.addEventListener("click", () => nudge(0, 1));
 
     document.getElementById("layout-tool-select")?.addEventListener("click", () => setTool("select"));
+      document.getElementById("layout-select-all")?.addEventListener("click", () => {
+        selectedIds = new Set(words.map(w => String(w.id)));
+        selectedId = Array.from(selectedIds).at(-1) || null;
+        refreshSelectionUI({ forceText: true });
+        if (multiSelectMode) hidePopover();
+        renderCanvas();
+        setStatus("Selected all: " + selectedIds.size);
+      });
+      document.getElementById("layout-clear-selection")?.addEventListener("click", () => {
+        selectedIds.clear();
+        selectedId = null;
+        refreshSelectionUI({ forceText: true });
+        renderCanvas();
+        setStatus("Selection cleared");
+      });
+      document.getElementById("layout-multi-select")?.addEventListener("click", () => {
+        multiSelectMode = !multiSelectMode;
+        document.getElementById("layout-multi-select")?.classList.toggle("active", multiSelectMode);
+        document.body.classList.toggle("layout-multi-select-active", multiSelectMode);
+        if (multiSelectMode) hidePopover();
+        setStatus(multiSelectMode ? "Multi-select on" : "Multi-select off");
+      });
     document.getElementById("layout-tool-pan")?.addEventListener("click", () => setTool("pan"));
     document.getElementById("layout-tool-add")?.addEventListener("click", () => setTool("add"));