Source: https://restorebunny.com/tools/image-sharpener/

[← All free image tools](<https://restorebunny.com/tools/>)

# Image Sharpener

Apply a local edge-enhancement filter with adjustable strength. Inspect the preview for halos before saving a PNG.

Free · No signupLocal browser processing

**Choose a photo**Up to 16 MP per photo · 20 MB per file · 80 MB per batch

Strength50%

**Result**Ready for your input

Your result will appear here

No signup or server upload.

Sharpening can amplify grain and compression artifacts. It changes contrast at edges rather than adding genuine captured resolution.

**Give an old photo a fresh start**

Repair fading and scan damage with RestoreBunny’s AI photo restoration.

[Restore a photo](<https://restorebunny.com/signup/>)

## How to use image sharpener

1. Choose your source file or files from this device.
2. Adjust the controls and inspect the result.
3. Download the output shown by the tool; keep the original files.

## A practical example

At strength zero the image is unchanged. Increasing strength emphasizes differences between a pixel and its immediate neighbors; it cannot recreate missing eyelashes or letters.

## Frequently asked questions

Is image sharpener free to use?

Yes. This utility works without a signup or paid credit. Files and calculations are processed in this browser.

What should I check before using the result?

Sharpening can amplify grain and compression artifacts. It changes contrast at edges rather than adding genuine captured resolution.

## Keep working on your photo

- [Browse all free tools](<https://restorebunny.com/tools/>)
- [Check photo resolution](<https://restorebunny.com/tools/photo-resolution-checker/>)

[Browse all free tools](<https://restorebunny.com/tools/>)

By RestoreBunny · Reviewed 2026-10-16. Utilities use local calculations or [browser image processing](<https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Pixel_manipulation_with_canvas>). The download button identifies the output format. Animated images export one decoded frame. Keep your original files.