diff --git a/src/components/mode-tools/mode-tools.jsx b/src/components/mode-tools/mode-tools.jsx
index 9aa4942696..a3055f1d18 100644
--- a/src/components/mode-tools/mode-tools.jsx
+++ b/src/components/mode-tools/mode-tools.jsx
@@ -7,6 +7,7 @@ import {changeBrushSize} from '../../reducers/brush-mode';
 import {changeBrushSize as changeEraserSize} from '../../reducers/eraser-mode';
 import {changeBitBrushSize} from '../../reducers/bit-brush-size';
 import {changeBitEraserSize} from '../../reducers/bit-eraser-size';
+import {changeRectRadius} from '../../reducers/rect-mode';
 import {setShapesFilled} from '../../reducers/fill-bitmap-shapes';
 
 import FontDropdown from '../../containers/font-dropdown.jsx';
@@ -33,6 +34,7 @@ import curvedPointIcon from '!../../tw-recolor/build!./icons/curved-point.svg';
 import eraserIcon from '../eraser-mode/eraser.svg';
 import flipHorizontalIcon from '!../../tw-recolor/build!./icons/flip-horizontal.svg';
 import flipVerticalIcon from '!../../tw-recolor/build!./icons/flip-vertical.svg';
+import roundRectIcon from '../rounded-rect-mode/rounded-rectangle.svg';
 import straightPointIcon from '!../../tw-recolor/build!./icons/straight-point.svg';
 import bitOvalIcon from '../bit-oval-mode/oval.svg';
 import bitRectIcon from '../bit-rect-mode/rectangle.svg';
@@ -54,6 +56,11 @@ const ModeToolsComponent = props => {
             description: 'Label for the eraser size input',
             id: 'paint.modeTools.eraserSize'
         },
+        rectRadius: {
+            defaultMessage: 'Corner radius',
+            description: 'Label for the corner radius input',
+            id: 'paint.modeTools.rectRadius'
+        },
         copy: {
             defaultMessage: 'Copy',
             description: 'Label for the copy button',
@@ -140,6 +147,34 @@ const ModeToolsComponent = props => {
             </div>
         );
     }
+    case Modes.RECT:
+    {
+        // to do: use reducers
+        const currentIcon = roundRectIcon;
+        const currentRadiusValue = props.rectRadius;
+        const changeFunction = props.onRectRadiusSliderChange;
+        return (
+            <div className={classNames(props.className, styles.modeTools)}>
+                <div>
+                    <img
+                        alt={props.intl.formatMessage(messages.rectRadius)}
+                        className={styles.modeToolsIcon}
+                        draggable={false}
+                        src={currentIcon}
+                    />
+                </div>
+                <LiveInput
+                    range
+                    small
+                    max={MAX_STROKE_WIDTH}
+                    min="1"
+                    type="number"
+                    value={currentRadiusValue}
+                    onSubmit={changeFunction}
+                />
+            </div>
+        );
+    }
     case Modes.BIT_ERASER:
         /* falls through */
     case Modes.ERASER:
@@ -314,6 +349,7 @@ ModeToolsComponent.propTypes = {
     className: PropTypes.string,
     clipboardItems: PropTypes.arrayOf(PropTypes.array),
     eraserValue: PropTypes.number,
+    rectRadius: PropTypes.number,
     fillBitmapShapes: PropTypes.bool,
     format: PropTypes.oneOf(Object.keys(Formats)),
     hasSelectedUncurvedPoints: PropTypes.bool,
@@ -323,6 +359,7 @@ ModeToolsComponent.propTypes = {
     onBitBrushSliderChange: PropTypes.func.isRequired,
     onBitEraserSliderChange: PropTypes.func.isRequired,
     onBrushSliderChange: PropTypes.func.isRequired,
+    onRectRadiusSliderChange: PropTypes.func,
     onCopyToClipboard: PropTypes.func.isRequired,
     onCurvePoints: PropTypes.func.isRequired,
     onDelete: PropTypes.func.isRequired,
@@ -345,7 +382,8 @@ const mapStateToProps = state => ({
     bitEraserSize: state.scratchPaint.bitEraserSize,
     brushValue: state.scratchPaint.brushMode.brushSize,
     clipboardItems: state.scratchPaint.clipboard.items,
-    eraserValue: state.scratchPaint.eraserMode.brushSize
+    eraserValue: state.scratchPaint.eraserMode.brushSize,
+    rectRadius: state.scratchPaint.rectMode.rectRadius
 });
 const mapDispatchToProps = dispatch => ({
     onBrushSliderChange: brushSize => {
@@ -360,6 +398,9 @@ const mapDispatchToProps = dispatch => ({
     onEraserSliderChange: eraserSize => {
         dispatch(changeEraserSize(eraserSize));
     },
+    onRectRadiusSliderChange: rectRadius => {
+        dispatch(changeRectRadius(rectRadius));
+    },
     onFillShapes: () => {
         dispatch(setShapesFilled(true));
     },
diff --git a/src/containers/rect-mode.jsx b/src/containers/rect-mode.jsx
index 872316b17e..0357cc5105 100644
--- a/src/containers/rect-mode.jsx
+++ b/src/containers/rect-mode.jsx
@@ -10,6 +10,7 @@ import GradientTypes from '../lib/gradient-types';
 
 import {changeFillColor, clearFillGradient, DEFAULT_COLOR} from '../reducers/fill-style';
 import {changeStrokeColor, clearStrokeGradient} from '../reducers/stroke-style';
+import {changeRectRadius} from '../reducers/rect-mode';
 import {changeMode} from '../reducers/modes';
 import {clearSelectedItems, setSelectedItems} from '../reducers/selected-items';
 import {setCursor} from '../reducers/cursor';
@@ -36,6 +37,9 @@ class RectMode extends React.Component {
         if (this.tool && nextProps.colorState !== this.props.colorState) {
             this.tool.setColorState(nextProps.colorState);
         }
+        if (this.tool && nextProps.rectRadius !== this.props.rectRadius) {
+            this.tool.setRectRadius(nextProps.rectRadius);
+        }
         if (this.tool && nextProps.selectedItems !== this.props.selectedItems) {
             this.tool.onSelectionChanged(nextProps.selectedItems);
         }
@@ -65,6 +69,7 @@ class RectMode extends React.Component {
             this.props.onUpdateImage
         );
         this.tool.setColorState(this.props.colorState);
+        this.tool.setRectRadius(this.props.rectRadius);
         this.tool.activate();
     }
     validateColorState () { // TODO move to shared class
@@ -140,7 +145,10 @@ RectMode.propTypes = {
     isRectModeActive: PropTypes.bool.isRequired,
     onChangeFillColor: PropTypes.func.isRequired,
     onChangeStrokeColor: PropTypes.func.isRequired,
+    // eslint-disable-next-line react/no-unused-prop-types
+    onChangeRectRadius: PropTypes.func.isRequired,
     onUpdateImage: PropTypes.func.isRequired,
+    rectRadius: PropTypes.number,
     selectedItems: PropTypes.arrayOf(PropTypes.instanceOf(paper.Item)),
     setCursor: PropTypes.func.isRequired,
     setSelectedItems: PropTypes.func.isRequired
@@ -148,6 +156,7 @@ RectMode.propTypes = {
 
 const mapStateToProps = state => ({
     colorState: state.scratchPaint.color,
+    rectRadius: state.scratchPaint.rectMode.rectRadius,
     isRectModeActive: state.scratchPaint.mode === Modes.RECT,
     selectedItems: state.scratchPaint.selectedItems
 });
@@ -175,6 +184,9 @@ const mapDispatchToProps = dispatch => ({
     },
     onChangeStrokeColor: strokeColor => {
         dispatch(changeStrokeColor(strokeColor));
+    },
+    onChangeRectRadius: rectRadius => {
+        dispatch(changeRectRadius(rectRadius));
     }
 });
 
diff --git a/src/helper/tools/rect-tool.js b/src/helper/tools/rect-tool.js
index 3bd84a0a25..2d90800073 100644
--- a/src/helper/tools/rect-tool.js
+++ b/src/helper/tools/rect-tool.js
@@ -46,6 +46,7 @@ class RectTool extends paper.Tool {
         this.colorState = null;
         this.isBoundingBoxMode = null;
         this.active = false;
+        this.rectRadius = 16;
     }
     getHitOptions () {
         return {
@@ -60,6 +61,9 @@ class RectTool extends paper.Tool {
             tolerance: RectTool.TOLERANCE / paper.view.zoom
         };
     }
+    setRectRadius (rectRadius) {
+        this.rectRadius = rectRadius;
+    }
     /**
      * Should be called if the selection changes to update the bounds of the bounding box.
      * @param {Array<paper.Item>} selectedItems Array of selected items.
@@ -100,7 +104,7 @@ class RectTool extends paper.Tool {
             rect.size = squareDimensions.size.abs();
         }
 
-        this.rect = new paper.Path.Rectangle(rect);
+        this.rect = new paper.Path.Rectangle(rect, this.rectRadius);
         if (event.modifiers.alt) {
             this.rect.position = event.downPoint;
         } else if (event.modifiers.shift) {
diff --git a/src/reducers/rect-mode.js b/src/reducers/rect-mode.js
new file mode 100644
index 0000000000..5b3796e2a5
--- /dev/null
+++ b/src/reducers/rect-mode.js
@@ -0,0 +1,31 @@
+import log from '../log/log';
+
+const CHANGE_RECT_RADIUS = 'scratch-paint/rect-mode/CHANGE_RECT_RADIUS';
+const initialState = {rectRadius: 0};
+
+const reducer = function (state, action) {
+    if (typeof state === 'undefined') state = initialState;
+    switch (action.type) {
+    case CHANGE_RECT_RADIUS:
+        if (isNaN(action.rectRadius)) {
+            log.warn(`Invalid corner radius: ${action.rectRadius}`);
+            return state;
+        }
+        return {rectRadius: Math.max(1, action.rectRadius)};
+    default:
+        return state;
+    }
+};
+
+// Action creators ==================================
+const changeRectRadius = function (rectRadius) {
+    return {
+        type: CHANGE_RECT_RADIUS,
+        rectRadius: rectRadius
+    };
+};
+
+export {
+    reducer as default,
+    changeRectRadius
+};
diff --git a/src/reducers/scratch-paint-reducer.js b/src/reducers/scratch-paint-reducer.js
index 3dc9be3308..cff5d33498 100644
--- a/src/reducers/scratch-paint-reducer.js
+++ b/src/reducers/scratch-paint-reducer.js
@@ -15,6 +15,7 @@ import formatReducer from './format';
 import hoverReducer from './hover';
 import layoutReducer from './layout';
 import modalsReducer from './modals';
+import rectModeReducer from './rect-mode';
 import selectedItemReducer from './selected-items';
 import textEditTargetReducer from './text-edit-target';
 import themeReducer from './theme';
@@ -39,6 +40,7 @@ export default combineReducers({
     hoveredItemId: hoverReducer,
     layout: layoutReducer,
     modals: modalsReducer,
+    rectMode: rectModeReducer,
     selectedItems: selectedItemReducer,
     textEditTarget: textEditTargetReducer,
     theme: themeReducer,