A real unsharp mask on a slider — crisper edges without the crunchy halo look, applied on your own device.
One image · processed on your device, nothing is uploaded
No size limit · files are processed on your device and never uploaded · how it works
Runs in your browser. Files are never uploaded — you can go offline after the page loads.
How to use the Sharpen Image
Drop one image.
Drag the strength slider — edges crisp up live.
Download at full resolution.
Easy to use
Drop files, pick options, download. Whole folders at once, no signup, no daily limit.
Best quality
The same engines the professionals use — SVGO, resvg, MozJPEG, libwebp, libavif — compiled to run in your browser.
Private & secure
Files are processed on your device and never uploaded. Close the tab and nothing remains anywhere.
What sharpening honestly does
An unsharp mask — the technique every editor from Photoshop to Lightroom uses — boosts contrast along edges so
detail that is present but soft reads crisp again. Scans, resized images and shots where focus missed by a hair
respond beautifully. What it cannot do is invent detail a blurry photo never captured; tools that claim to are
generating their best guess, not recovering your image.
The classic mistake is over-doing it: past a point, bright halos ring every edge. Stay where the preview looks
natural — usually 40–60 — and sharpen after resizing, never before.
Frequently asked questions
Can sharpening fix a blurry photo?
Honestly: it rescues slightly soft images — a missed focus by a hair, a scan, a resized photo — by boosting edge contrast. It cannot recreate detail that was never captured; a truly blurred photo needs AI reconstruction, which trades accuracy for looks.
What strength should I use?
40–60 suits most photos. Push further and bright halos appear along edges — the tell-tale of over-sharpening. The live preview makes the sweet spot easy to find.
Most online converters upload your file to a server. InfyTool ships the actual encoders to your browser as WebAssembly instead, so processing happens inside your tab — faster for batches, and nothing to delete afterwards.
No upload, ever. Turn off Wi-Fi after the page loads and every tool keeps working.
No limits. No file-size cap, no queue, no watermark, no account.
Runs on your CPU. Batches use several cores in parallel; nothing is throttled.