# Sharpen Image Online - Make Blurry Photos Clearer

> Free online image sharpener: an unsharp mask brings back detail and edges in slightly blurry photos, with amount, radius and threshold and a 1:1 preview.

- URL: https://qilingtools.com/en/image/sharpen
- Category: Image Tools (https://qilingtools.com/en/image)
- Tags: [Image](https://qilingtools.com/en/tags/image), [Photo Editing](https://qilingtools.com/en/tags/photo)
- Last updated: 2026-10-26
- Price: Free, no sign-up
- Privacy: Runs locally in the browser; files are never uploaded

Sharpen photos that are slightly out of focus, softened by compression or blurred after downscaling. The tool uses the unsharp mask (USM) technique familiar from photo editors: amount controls the strength, radius sets the size of detail affected, and threshold prevents noise in smooth areas from being amplified. The preview shows the original and sharpened centre of your image side by side at 1:1. Batch supported, original format and size kept, all in your browser.

## How to use

1. Drop in one or more photos
2. Adjust amount, radius and threshold while comparing the preview
3. Click Sharpen and download

## Features

- Professional unsharp mask algorithm
- Amount, radius and threshold controls
- Side-by-side 1:1 comparison
- Batch processing, format and size kept

## FAQ

### Can it fix a very blurry photo?

Sharpening enhances detail that is already there, so it works well on mild blur. Severe defocus, motion blur or tiny images cannot have lost detail recreated.

### I see halos or noise after sharpening — what now?

Lower the amount or radius to reduce halos around edges, and raise the threshold to leave smooth areas like sky and skin untouched.

### Are my files or data uploaded?

No. Everything runs locally in your browser with no network upload, and is discarded when you close the page.

### Do I need to sign up or pay?

No. The site is completely free, needs no account and has no usage limits.

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