About this tool
Sharpen uses the unsharp mask technique — the same method used by professional image editors — to enhance edge detail. Amount, Radius and Threshold controls give you precise command over the sharpening effect.
How it works
- 1Upload your image.
- 2Set Amount (0–300%), Radius (1–5) and Threshold (0–30).
- 3The tool creates a blurred copy and enhances the difference from the original.
- 4Pixels above the threshold are sharpened — noise below it is left alone.
Common use cases
- ✓Recovering detail from slightly out-of-focus photos
- ✓Enhancing text in scanned documents
- ✓Product photography detail enhancement
- ✓Sharpening after resizing or compression
Privacy first. Sharpen runs entirely inside your browser using the HTML5 Canvas API. Your images are never uploaded to any server, stored anywhere or shared with third parties. Everything happens locally on your device.
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