Sharpen an image online
Add some bite back to a photo that looks slightly soft — a common side effect of resizing down, a gentle camera lens, or a photo that was compressed more than once. Add your images, choose an amount, and download the result.
This works by increasing contrast right at edges, which is what a human eye reads as sharpness — it cannot invent detail that isn't there. A genuinely out-of-focus or blurry photo will not become crisp; it will mostly just get a slightly harder-edged version of the same blur.
Your images never leave your device. Sharpening runs entirely in your browser, so nothing is uploaded, stored, or scanned, and a batch costs no more than a single file.
or drop them here — nothing is uploaded
How to sharpen image
Add your images
Drop JPG, PNG, or WebP files into the box, or click to browse.
Choose an amount
Light is safe for most photos. Strong is worth trying on a photo that was resized down and looks a little soft as a result.
Sharpen and download
Press Sharpen Image. One file downloads on its own; several arrive as a ZIP.
Frequently asked questions
Are my images uploaded anywhere?
No. Sharpening runs in your browser using JavaScript, so your files stay on your device. You can confirm this by opening your browser devtools Network tab while working — there are no upload requests.
Can this fix a blurry or out-of-focus photo?
Not really. Sharpening increases contrast at existing edges, which reads as crisper to the eye, but it cannot reconstruct detail a lens never captured. A photo that is genuinely out of focus will still look out of focus after this — just with harder edges around the blur.
When does sharpening actually help?
Most usefully after resizing an image down, which softens detail slightly as a normal side effect of shrinking — sharpening afterward is a standard way to compensate. It also helps a photo that has been through a couple of lossy compression passes and picked up a small amount of softness along the way.
Why does a strong setting look grainy or add odd outlines?
Because sharpening amplifies contrast at every edge it finds, including ones that were faint noise rather than real detail — turning that noise more visible is the trade-off. If a photo looks grainy after a strong setting, try Light instead, or reduce noise first with the dedicated tool.
Is there a limit on how many files?
Thirty at a time, which is a limit of your device rather than our policy — everything is held in memory while it works.
What about the opposite — reducing noise?
That is Image Noise Reduction, a separate tool built for that.