diff --git a/packages/website/src/components/App.jsx b/packages/website/src/components/App.jsx
index 8bc96d15..6380f0ee 100644
--- a/packages/website/src/components/App.jsx
+++ b/packages/website/src/components/App.jsx
@@ -7,6 +7,7 @@ import Editor from "./Editor.jsx";
 import OutputToolbar from "./OutputToolbar.jsx";
 import Output from "./Output.jsx";
 import Errors from "./Errors.jsx";
+import Resize from "./Resize.jsx";
 
 const worker = new ReloadablePromiseWorker(() => new Worker(new URL("../worker.js", import.meta.url), { type: "module" }));
 
@@ -28,8 +29,10 @@ export default function App({ initialSrc }) {
   const [errors, setErrors] = useState([]);
   const [zoom, setZoom] = useState("fit");
   const [isValid, setValid] = useState(false);
-  const imageZoomRef = useRef(null);
+
+  const appRef = useRef(null);
   const editorRef = useRef(null);
+  const imageZoomRef = useRef(null);
 
   function handleCopyLink() {
     copyLink(src);
@@ -50,6 +53,10 @@ export default function App({ initialSrc }) {
     setDebouncedSrc(example);
   }
 
+  function handleResize(width) {
+    appRef.current.style.setProperty("--editor-width", width + "px");
+  }
+
   const handleSrcChangeDebounced = useMemo(() => {
     return debounce(setDebouncedSrc, 750);
   }, []);
@@ -88,12 +95,13 @@ export default function App({ initialSrc }) {
   const zoomEnabled = result?.format == "svg-image";
 
   return (
-    <>
+    <div id="app" ref={appRef}>
       <EditorToolbar onLoadExample={handleLoadExample} onCopyLink={handleCopyLink} />
       <Editor defaultValue={src} onChange={handleSrcChange} ref={editorRef} />
+      <Resize onResize={handleResize} />
       <OutputToolbar options={options} onOptionChange={handleOptionChange} zoomEnabled={zoomEnabled} zoom={zoom} onZoomChange={setZoom} onZoomIn={() => imageZoomRef.current?.zoomIn()} onZoomOut={() => imageZoomRef.current?.zoomOut()} />
       <Output result={result} zoom={zoom} imageZoomRef={imageZoomRef} onZoomChange={setZoom} isValid={isValid} />
       <Errors errors={errors} />
-    </>
+    </div>
   );
 }
diff --git a/packages/website/src/components/Resize.jsx b/packages/website/src/components/Resize.jsx
new file mode 100644
index 00000000..8a02a720
--- /dev/null
+++ b/packages/website/src/components/Resize.jsx
@@ -0,0 +1,40 @@
+import { useEffect, useRef } from "react";
+
+let dragging = false;
+let dragOffset;
+
+export default function Resize({ onResize }) {
+  function handleMouseDown(e) {
+    e.preventDefault();
+
+    const rect = e.target.getBoundingClientRect();
+
+    dragging = true;
+    dragOffset = Math.round(e.clientX - rect.left);
+  }
+
+  function handleMouseMove(e) {
+    if (dragging) {
+      let width = Math.max(0, e.clientX - dragOffset);
+      onResize(width);
+    }
+  }
+
+  function handleMouseUp() {
+    dragging = false;
+  }
+
+  useEffect(() => {
+    window.addEventListener("mousemove", handleMouseMove);
+    window.addEventListener("mouseup", handleMouseUp);
+  }, []);
+
+  let resizeRef = useRef(null);
+
+  return (
+    <div className="resize" ref={resizeRef} onMouseDown={handleMouseDown}>
+      <div className="resize-handle">
+      </div>
+    </div>
+  );
+}
diff --git a/packages/website/src/index.html b/packages/website/src/index.html
index 4e51596b..cdd4efdc 100644
--- a/packages/website/src/index.html
+++ b/packages/website/src/index.html
@@ -21,7 +21,7 @@
       </nav>
     </header>
 
-    <div id="app">
+    <div id="root">
     </div>
   </div>
 
diff --git a/packages/website/src/index.jsx b/packages/website/src/index.jsx
index 91e73713..56dd6a2f 100644
--- a/packages/website/src/index.jsx
+++ b/packages/website/src/index.jsx
@@ -6,7 +6,7 @@ import { getExample, defaultExampleName } from "./examples.js";
 
 const initialSrc = getInputFromSearch(window.location.search, getExample(defaultExampleName));
 
-const root = createRoot(document.getElementById("app"));
+const root = createRoot(document.getElementById("root"));
 root.render(
   <StrictMode>
     <App initialSrc={initialSrc} />
diff --git a/packages/website/src/styles/app.css b/packages/website/src/styles/app.css
index c387b813..c02b89da 100644
--- a/packages/website/src/styles/app.css
+++ b/packages/website/src/styles/app.css
@@ -17,17 +17,22 @@ body {
   grid-template-rows: max-content minmax(0, 1fr);
 }
 
-#app {
+#root {
+  display: grid;
   grid-area: app;
+}
+
+#app {
+  --editor-width: 50%;
+
   display: grid;
-  grid-template-areas: "editor-toolbar output-toolbar" "editor output" "editor errors";
-  grid-template-columns: 50% 1fr;
+  grid-template-areas: "editor-toolbar resize output-toolbar" "editor resize output" "editor resize errors";
+  grid-template-columns: minmax(300px, var(--editor-width)) 1px minmax(450px, 1fr);
   grid-template-rows: max-content 1fr fit-content(20%);
 }
 
 .editor {
   grid-area: editor;
-  border-right: 1px solid #ccc;
 }
 
 .cm-editor {
@@ -91,7 +96,6 @@ body {
 
 .editor-toolbar {
   grid-area: editor-toolbar;
-  border-right: 1px solid #ccc;
   justify-content: center;
 }
 
@@ -160,17 +164,9 @@ body {
     grid-template-rows: max-content 30% max-content 1fr fit-content(20%);
   }
 
-  .editor {
-    border-right: none;
-  }
-
   .output-toolbar {
     border-top: 1px solid #ccc;
   }
-
-  .editor-toolbar {
-    border-right: none;
-  }
 }
 
 @media (max-width: 450px) {
@@ -178,3 +174,26 @@ body {
     font-size: 16px;
   }
 }
+
+
+.resize {
+  grid-area: resize;
+  background: #ccc;
+  position: relative;
+  z-index: 1;
+}
+
+.resize-handle {
+  width: 7px;
+  left: -3px;
+  position: absolute;
+  top: 0;
+  bottom: 0;
+  cursor: ew-resize;
+}
+
+@media (max-width: 750px) {
+  .resize {
+    display: none;
+  }
+}