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A quick way to understand who this helps, what it solves, and where it connects next.
Anyone sharpening slightly soft photos.
Using the sharpen image without installing anything or signing up.
Capture sharpen-image intent with a fast, browser-side tool that runs 100% locally.
Cleanor Labs
These sections explain the job in plain language and set expectations for what the tool should do well.
This image sharpener applies a genuine unsharp-mask convolution to your photo, computing the blurred version and adding back the difference pixel by pixel to crisp up edges. A strength slider controls how strong the effect is, and a threshold slider skips small differences so flat areas and noise are left alone. You get a side-by-side before and after preview and can download the result as a PNG. Large images are scaled down for speed, and the whole process runs on an HTML canvas in your browser, so your image never leaves your device.
Short answers for the questions people usually have before trying a utility like this.
It uses an unsharp mask: the tool blurs the image, subtracts that from the original to find edges, and adds a scaled amount of that difference back to sharpen them.
Threshold ignores differences smaller than the set value, so smooth areas and image noise are not amplified while real edges still get sharpened.
No. All processing happens locally on a canvas in your browser, and the image is never sent to a server.
Every tool on Cleanor is free with no sign-up, no credits, and no limits. Files are processed privately in your browser. Looking for on-device phone cleanup and Premium features? That lives in the Cleanor app.
Upload a photo and apply an unsharp-mask convolution filter to crisp up edges. Compare before and after, adjust the strength, then download the result. Everything runs in your browser.
Pick an image to sharpen it locally.
Raise the amount for a stronger effect. Threshold skips small differences so flat areas and noise are left alone. Large images are scaled to 2000px on the long edge.
Before
After
The sharpen kernel is computed pixel by pixel on an HTML canvas. Your image never leaves your device.