Sharpen Image Online

What this tool does

Sharpen image detail here without installing an editor, uploading the file or making an account. Drop in a photo, a screenshot or a frame grabbed from your video and it is sharpened straight away with a standard unsharp mask. Three sliders control the effect, Show original flips back to the untouched picture, and the download keeps the full resolution, as JPG, PNG or WebP.

How to sharpen a blurry image

1. Add the image. Drop it onto the page, paste it, or choose it from your disk.
2. Start from a preset. Standard suits most slightly soft photos and frames. Subtle is for images that are nearly there; Strong is for a frame that is noticeably soft.
3. Tune the three sliders. Amount is how strongly edges are boosted. Radius is how wide the boosted edge is: below about 1 px for fine texture such as hair and fabric, higher for a generally soft picture. Threshold leaves gentle tone changes alone, so smooth skin and skies do not turn grainy.
4. Compare and watch the readout. Edge contrast shows how much the fine detail has been lifted. If the share of pure white or black pixels jumps, the tool warns you, because that is what halos look like in numbers.
5. Download the result. PNG keeps transparency, so a cutout stays a cutout.

Why sharpening cannot truly unblur a photo

An unsharp mask compares each pixel with a blurred copy of the image and pushes the difference further apart. Edges that are already in the picture get crisper; detail that motion blur or a missed focus smeared away does not come back. A slightly soft frame from a video, or a photo that has been scaled up a little, is where it earns its keep. For a badly blurred shot, the honest fix is a better source frame, which is quicker to find with the video frame grabber.

Sharpened on your device, with every control

Many of the pages that rank for this search are AI enhancers that upload your photo to a server, and some cap the free version or keep batch work for a paid plan. Others give you one strength slider and no way to see what it did. Here the unsharp mask runs in your browser, so the image never leaves your device, you get amount, radius and threshold, and there is no watermark. Sharpening is done on brightness only, so edges do not pick up coloured fringes.

If your finished thumbnail still looks soft on YouTube, read why your YouTube thumbnail is blurry. To fix exposure first, use adjust image brightness, check the result at feed size with the thumbnail preview, or generate a thumbnail from scratch.

Last updated November 12, 2026.