diff --git a/celstomp/js/ui/interaction-shortcuts.js b/celstomp/js/ui/interaction-shortcuts.js
index 5359ed6..945227d 100644
--- a/celstomp/js/ui/interaction-shortcuts.js
+++ b/celstomp/js/ui/interaction-shortcuts.js
@@ -580,6 +580,47 @@ function _wireExtraKeyboardShortcuts() {
       }, true);
   }
 }
+
+function flipSelection(horizontal) {
+    if (!rectSelection.active) return;
+    const c = getFrameCanvas(rectSelection.L, rectSelection.F, rectSelection.key);
+    if (!c) return;
+    const ctx = c.getContext("2d", { willReadFrequently: true });
+    if (!ctx) return;
+
+    const selSnap = ctx.getImageData(rectSelection.x, rectSelection.y, rectSelection.w, rectSelection.h);
+    const fullSnap = ctx.getImageData(0, 0, contentW, contentH);
+
+    beginGlobalHistoryStep(rectSelection.L, rectSelection.F, rectSelection.key);
+
+    ctx.clearRect(rectSelection.x, rectSelection.y, rectSelection.w, rectSelection.h);
+
+    const flipped = ctx.createImageData(rectSelection.w, rectSelection.h);
+    const src = selSnap.data;
+    const dst = flipped.data;
+
+    for (let y = 0; y < rectSelection.h; y++) {
+        for (let x = 0; x < rectSelection.w; x++) {
+            const srcIdx = (y * rectSelection.w + x) * 4;
+            const dstY = horizontal ? y : (rectSelection.h - 1 - y);
+            const dstX = horizontal ? (rectSelection.w - 1 - x) : x;
+            const dstIdx = (dstY * rectSelection.w + dstX) * 4;
+            dst[dstIdx] = src[srcIdx];
+            dst[dstIdx + 1] = src[srcIdx + 1];
+            dst[dstIdx + 2] = src[srcIdx + 2];
+            dst[dstIdx + 3] = src[srcIdx + 3];
+        }
+    }
+
+    ctx.putImageData(flipped, rectSelection.x, rectSelection.y);
+
+    markGlobalHistoryDirty();
+    commitGlobalHistoryStep();
+    recomputeHasContent(rectSelection.L, rectSelection.F, rectSelection.key);
+    queueRenderAll();
+    updateTimelineHasContent(rectSelection.F);
+}
+
 function wireKeyboardShortcuts() {
   if (document._celstompKeysWired) return;
   document._celstompKeysWired = true;
@@ -749,6 +790,14 @@ function onWindowKeyDown(e) {
             return;
         }
     }
+    if (rectSelection.active && (e.key.toLowerCase() === "h" || e.key.toLowerCase() === "v")) {
+        const tag = e.target && e.target.tagName ? e.target.tagName.toUpperCase() : "";
+        if (tag !== "INPUT" && tag !== "TEXTAREA" && tag !== "SELECT") {
+            e.preventDefault();
+            flipSelection(e.key.toLowerCase() === "h");
+            return;
+        }
+    }
     if ((e.key === "Delete" || e.key === "Backspace") && rectSelection.active) {
         const tag = e.target && e.target.tagName ? e.target.tagName.toUpperCase() : "";
         if (tag !== "INPUT" && tag !== "TEXTAREA" && tag !== "SELECT") {
diff --git a/celstomp/parts/modals.js b/celstomp/parts/modals.js
index 5351362..3c71714 100644
--- a/celstomp/parts/modals.js
+++ b/celstomp/parts/modals.js
@@ -70,13 +70,18 @@ document.getElementById('part-modals').innerHTML = `
         <div class="shortcutRow"><kbd>E</kbd><span>Prev Frame</span></div>
         <div class="shortcutRow"><kbd>R</kbd><span>Next Frame</span></div>
       </div>
+      <div class="shortcutSection">
+        <h4>Selection</h4>
+        <div class="shortcutRow"><kbd>H</kbd><span>Flip Horizontal</span></div>
+        <div class="shortcutRow"><kbd>V</kbd><span>Flip Vertical</span></div>
+        <div class="shortcutRow"><kbd>Del</kbd><span>Delete Selection</span></div>
+      </div>
       <div class="shortcutSection">
         <h4>Actions</h4>
         <div class="shortcutRow"><kbd>Space</kbd><span>Play/Pause</span></div>
         <div class="shortcutRow"><kbd>Ctrl+Z</kbd><span>Undo</span></div>
         <div class="shortcutRow"><kbd>Ctrl+Y</kbd><span>Redo</span></div>
         <div class="shortcutRow"><kbd>Ctrl+Shift+Z</kbd><span>Redo</span></div>
-        <div class="shortcutRow"><kbd>Del</kbd><span>Delete Selection/Color</span></div>
         <div class="shortcutRow"><kbd>F</kbd><span>Fill Current Frame</span></div>
         <div class="shortcutRow"><kbd>O</kbd><span>Toggle Onion</span></div>
       </div>