diff --git a/README.md b/README.md
index ba128ce..844afda 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,7 @@ export default MyEditor
 | border                 | Number\|Number[] | The cropping border. Image will be visible through the border, but cut off in the resulting image. Treated as horizontal and vertical borders when passed an array.                                                                                                  |
 | borderRadius           | Number           | The cropping area border radius.                                                                                                                                                                                                                                     |
 | color                  | Number[]         | The color of the cropping border, in the form: [red (0-255), green (0-255), blue (0-255), alpha (0.0-1.0)].                                                                                                                                                          |
+| borderColor            | Number[]         | The color of the 1px border around the mask, in the form: [red (0-255), green (0-255), blue (0-255), alpha (0.0-1.0)]. If not provided, no border will be drawn.                                                                                                     |
 | backgroundColor        | String           | The background color of the image if it's transparent.                                                                                                                                                                                                               |
 | style                  | Object           | Styles for the canvas element.                                                                                                                                                                                                                                       |
 | scale                  | Number           | The scale of the image. You can use this to add your own resizing slider.                                                                                                                                                                                            |
diff --git a/packages/demo/src/App.tsx b/packages/demo/src/App.tsx
index 365de97..9b6e41c 100644
--- a/packages/demo/src/App.tsx
+++ b/packages/demo/src/App.tsx
@@ -31,6 +31,7 @@ type State = {
   isTransparent: boolean
   backgroundColor?: string
   showGrid: boolean
+  borderColor: string
 }
 
 const App = () => {
@@ -49,6 +50,7 @@ const App = () => {
     isTransparent: false,
     backgroundColor: undefined,
     showGrid: false,
+    borderColor: '#ffffff80', // Default border color (white with 50% opacity)
   })
 
   const handleNewImage = (e: ChangeEvent<HTMLInputElement>) => {
@@ -153,6 +155,10 @@ const App = () => {
   const handleShowGrid = (e: ChangeEvent<HTMLInputElement>) =>
     setState({ ...state, showGrid: e.target.checked })
 
+  const handleBorderColorChange = (e: ChangeEvent<HTMLInputElement>) => {
+    setState({ ...state, borderColor: e.target.value })
+  }
+
   return (
     <div>
       <Dropzone
@@ -178,6 +184,7 @@ const App = () => {
               onImageReady={logCallback.bind(this, 'onImageReady')}
               image={state.image}
               disableCanvasRotation={state.disableCanvasRotation}
+              borderColor={hexToRgba(state.borderColor)}
             />
             <input
               name="newImage"
@@ -292,6 +299,26 @@ const App = () => {
         </div>
       )}
       <br />
+      Border Color:
+      <input
+        name="borderColor"
+        type="color"
+        value={state.borderColor.slice(0, 7)}
+        onChange={handleBorderColorChange}
+      />
+      Opacity:
+      <input
+        name="borderOpacity"
+        type="range"
+        min="0"
+        max="255"
+        value={parseInt(state.borderColor.slice(7, 9), 16)}
+        onChange={(e) => {
+          const opacity = parseInt(e.target.value).toString(16).padStart(2, '0')
+          setState({ ...state, borderColor: state.borderColor.slice(0, 7) + opacity })
+        }}
+      />
+      <br />
       <input type="button" onClick={handleSave} value="Preview" />
       <br />
       {state.preview && (
@@ -322,4 +349,13 @@ const App = () => {
   )
 }
 
-export default App
+// Helper function to convert hex color with alpha to RGBA array
+function hexToRgba(hex: string): [number, number, number, number] {
+  const r = parseInt(hex.slice(1, 3), 16)
+  const g = parseInt(hex.slice(3, 5), 16)
+  const b = parseInt(hex.slice(5, 7), 16)
+  const a = hex.length === 9 ? parseInt(hex.slice(7, 9), 16) / 255 : 1
+  return [r, g, b, a]
+}
+
+export default App
\ No newline at end of file
diff --git a/packages/lib/src/index.ts b/packages/lib/src/index.ts
index 5f953d5..76c727f 100644
--- a/packages/lib/src/index.ts
+++ b/packages/lib/src/index.ts
@@ -56,6 +56,7 @@ const drawRoundedRect = (
       Math.PI * 0.5,
       Math.PI,
     )
+    context.closePath()
     context.translate(-x, -y)
   }
 }
@@ -126,6 +127,7 @@ export interface Props {
   disableBoundaryChecks?: boolean
   disableHiDPIScaling?: boolean
   disableCanvasRotation?: boolean
+  borderColor?: [number, number, number, number?]
 }
 
 export interface Position {
@@ -592,6 +594,22 @@ class AvatarEditor extends React.Component<PropsWithDefaults, State> {
     context.rect(width, 0, -width, height) // outer rect, drawn "counterclockwise"
     context.fill('evenodd')
 
+    // Draw 1px border around the mask only if borderColor is provided
+    if (this.props.borderColor) {
+      context.strokeStyle = 'rgba(' + this.props.borderColor.slice(0, 4).join(',') + ')'
+      context.lineWidth = 1
+      context.beginPath()
+      drawRoundedRect(
+        context,
+        borderSizeX + 0.5,
+        borderSizeY + 0.5,
+        width - borderSizeX * 2 - 1,
+        height - borderSizeY * 2 - 1,
+        borderRadius,
+      )
+      context.stroke()
+    }
+
     if (this.props.showGrid) {
       drawGrid(
         context,
@@ -713,6 +731,7 @@ class AvatarEditor extends React.Component<PropsWithDefaults, State> {
       disableCanvasRotation,
       showGrid,
       gridColor,
+      borderColor,
       ...rest
     } = this.props