Sharpen Image

Fix blurry or soft photos with adjustable sharpening. Set the strength, apply, compare with the original, then download. No upload, everything in your browser.

Drag an image here, or click to browse

JPG, PNG, WebP supported

How to sharpen a photo

Set strength, apply, download. Three clicks.

1

Drop your image

Drag any JPG, PNG or WebP.

2

Set the strength

Lower values for subtle enhancement. Higher values for aggressive sharpening.

3

Click Apply

Sharpening processes every pixel so it requires a manual apply step.

4

Compare and download

Click Show Original to compare. Download when satisfied.

How sharpening works behind the scenes

The tool uses a convolution kernel, which is a small 3x3 grid of numbers that slides across every pixel in your image. At each position, it looks at the pixel and its four neighbours (up, down, left, right) and calculates a new value based on the weighted differences. The net effect is that edges get enhanced because areas where color changes abruptly get pushed further apart.

This is the same fundamental technique used by Photoshop's Unsharp Mask filter, just simplified. The strength slider controls how much weight is given to the edge detection. Low values produce a gentle enhancement. High values produce an aggressively crisp, almost harsh result that can look artificial if overdone.

Sharpening vs deblurring

They are related but different. Sharpening enhances edges that are already present. Deblurring tries to reverse the mathematical blur that was applied (by camera shake, defocus etc). True deblurring requires AI models and significantly more compute. This tool does sharpening, not deblurring. For slightly soft photos and scanned documents, sharpening is usually enough.

Other tools you might need

Adjust Image →Image Filters →Compress Image →

Frequently asked questions

Can this fix a completely out of focus photo?+
Not really. Sharpening enhances existing edges. If there are no edges to enhance because the entire photo is a blur, the result will mostly be noisy. It works best on photos that are slightly soft or camera shake.
Why is sharpening not live?+
The tool processes every single pixel through a convolution kernel. On large images that is millions of calculations. Rather than lag while you drag the slider, we let you set the strength first and then apply it.
Will sharpening add noise?+
High sharpening strength on a photo with existing compression artifacts can amplify that noise. Start with a lower strength and increase gradually. 50 to 80% is usually enough for a subtle improvement.
Does this work on text screenshots?+
Yes, and often quite well. Slightly blurry text in a screenshot responds well to sharpening because text has clear high contrast edges that the algorithm can enhance.