Image Sharpener
Sharpen soft images with three engines, a precision loupe, and batch support. Sharpening adds edge contrast — it cannot recover lost focus.
No watermarkFree & unlimited
All processing happens in your browser. No data is sent to any server.
About this tool
- 1
Upload a soft photo
Select a photo that is slightly soft, a little shaken, or marginally out of focus.
- 2
Pick a sharpening engine
Unsharp mask for general work, smart sharpen for edge-aware sharpening with fewer noise artifacts, detail enhance for fine texture.
- 3
Tune radius, strength and threshold
Raise strength until the image looks crisp, then back off as soon as pale halos appear along edges.
- 4
Download the result
Save the sharpened image as a PNG.
- Sharpening raises local contrast at edges. It makes a soft photo look sharper; it does not recover detail the lens never recorded.
- Bright or dark outlines along edges mean the strength is too high - reduce it or raise the threshold.
- Raise the threshold on noisy images so flat areas are left alone.
- Denoise first if the photo is both noisy and soft, otherwise you sharpen the noise too.
- Three engines: unsharp mask, smart sharpen, detail enhance
- Radius, strength and threshold controls
- Light / medium / strong presets
- Before-after comparison with a zoom loupe
- Runs entirely in your browser
- Crisp up a slightly soft portrait or event photo.
- Recover snap in a handheld shot with mild camera shake.
- Sharpen a macro or close-up that missed focus by a hair.
- Restore edge definition after resizing an image down.
No. This is a sharpening filter, not blur deconvolution and not a generative model. It boosts contrast at edges that are already there. If the detail is gone from the file, nothing here can put it back - the best results come from photos that were nearly sharp already.
Halos are the bright or dark outlines that appear beside edges when the sharpening amount is too high for the radius you chose. Lower strength, or lower the radius, until they disappear.
It measures local edge strength first and sharpens edges harder than flat areas, so noise in skies and shadows is amplified less than it would be by a plain unsharp mask.
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