How do I know how much sharpening to apply?

Start with a moderate amount and increase gradually while checking the preview — over-sharpening creates a visible halo effect around edges, which is the sign you've gone too far.

Can sharpening fix a very blurry, out-of-focus photo?

It helps with mild softness, but sharpening can't recover detail that was never captured — severely out-of-focus photos have limits to how much improvement is possible.

What is an unsharp mask, technically?

It's a classic sharpening technique that increases contrast specifically along edges in the image, making them appear crisper without uniformly sharpening flat areas.

Does Image Sharpener upload my files to a server?

No. Image Sharpener runs entirely in your browser using on-device processing, your files never leave your device.

Image Sharpener

Sharpen a blurry or soft image with an adjustable unsharp-mask effect.

Runs in your browser

Drop an image here

Choose File

About this tool

A photo that's slightly out of focus or was softened by compression can often be meaningfully improved with sharpening, though it needs to be applied carefully — too much creates a harsh, artificial-looking edge halo. This tool sharpens a blurry or soft image with an adjustable unsharp-mask effect, giving you control over the intensity so you can improve clarity without over-processing the result.

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