Sharpen Image
Enhance detail and edges with an adjustable sharpen strength. Runs entirely in your browser.
Sharpen an image
Upload an image, then drag the slider to set the sharpen strength. The preview updates instantly.
Drag & drop an image here, or click to browse
Supports JPG, PNG and WEBP.
Preview
Your image is processed locally in this browser tab using the Canvas API. It is never uploaded to Calcooo or any server.
How to use this tool
- Drag and drop an image into the box above, or click to browse and select one.
- Drag the Sharpen strength slider to set how strongly edges are enhanced.
- Check the live preview — it updates as you move the slider. Use Reset to return to the default strength.
- Click Download image to save the result.
FAQ
Frequently asked questions
Is my image uploaded anywhere when I sharpen it?
No. The sharpening is computed locally in your browser using the Canvas API. It never leaves your device.
How does sharpening work?
It uses a convolution filter that increases contrast at edges, making detail appear crisper — this is the same "unsharp mask" technique used in photo editors.
Can oversharpening cause artifacts?
Yes, very high strength can introduce a harsh, over-processed look or visible noise, especially on already-sharp images. Start low and increase gradually.
Does this add detail that wasn't there?
No, it can't recover detail lost to blur or low resolution — it only enhances existing edge contrast.