Background Blur (Lasso Keep/Blur)

Choose image

Tip: You can also drag & drop an image anywhere on this page.

Blur radius (px)

Higher = stronger blur (uses canvas filter).

Mode

Draw a freehand loop around the subject (lasso). Click Finish Lasso to apply. If you draw again, the new lasso replaces the old one.

Goal: Use a freehand lasso to blur the background or, inversely, blur inside the lasso.
Load image: Click Choose image or drop a file anywhere on the page. Images stay on your device (processed in your browser).
Draw lasso: Press, drag to outline, and release. A dashed line indicates the current path.
Finish Lasso: Applies blur using the current Mode and Blur radius.
Modes:
- Keep selection sharp: Blurs everything outside your lasso (typical background blur).
- Blur selection: Blurs everything inside your lasso.
Radius: Pixel radius used by the blur filter (try 8-20). Larger values cost more performance.
Download: Exports a PNG of the current canvas.
Notes:
- The lasso is a rough freehand mask-zoom in for higher precision if needed (use your browser zoom).
- Re-draw to replace the previous lasso. Finish Lasso reapplies with updated settings.
- Very large images can be heavy in the browser; consider resizing before processing if performance is slow.

Privacy: Nothing leaves your device. No uploads or network requests are made by this tool.

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