Sharpen Image
Bring out edge detail with a tunable unsharp-mask slider. Great for slightly soft phone photos, scanned documents, and product shots.
Drop a photo to start
JPG, PNG, WebP, HEIC up to 40 MB · stays in your browser
Never uploaded · 100% browser-side
How it works
- 1
Drop your photo
Drag & drop or browse to upload. JPG, PNG, WebP, HEIC up to 40 MB.
- 2
Drag the sharpen slider
The slider runs from 0 (no change) to 100 (full sharpen). Each pixel is enhanced via a 3×3 unsharp-mask kernel - edge contrast goes up, soft areas stay smooth.
- 3
Download or open in editor
Save the adjusted result, or open it in our AI editor to stack additional adjustments, filters, and AI tools.
Why use this online tool
Real unsharp-mask kernel
3×3 convolution with adjustable centre weight - the same algorithm used by Photoshop / Lightroom's clarity-style sharpen. Not a fake CSS-filter approximation.
Live preview
Drag the slider and see the result update instantly. No 'apply' click - find the exact value that works for your photo, then save.
100% browser-side
The adjustment runs on a Canvas in your browser. Your photo never leaves your device - no upload, no server, no privacy risk.
Free, no watermark
Unlimited adjustments, no signup, no overlay on the output.
When to use it
- Slightly soft phone photos where the autofocus didn't quite nail it
- Product shots that need crisp edges for e-commerce listings
- Scanned documents or signs where text needs to read clearly
- Travel photos with light haze where edge detail got smoothed
- Screenshots resized down where text antialiasing softened the result
Frequently asked questions
- Does this upload my photo to a server?
- No. The adjustment runs entirely in your browser using direct ImageData pixel manipulation. Your image never leaves your device.
- Will sharpening make my photo look grainy?
- At high values (80+), sharpening can amplify any grain or noise that was already there - especially in low-light photos. Drop to 30-50 for natural sharpening; reserve 80+ for resolution-loss recovery on rescaled / blurred sources.
- Can I sharpen a blurry photo?
- If the blur is light (slight focus miss, mild motion blur), yes - sharpening will recover most of the perceived crispness. For severe blur, sharpening can't recover lost data; use our AI editor's focus-recovery model for those cases.
- Is this slow on big images?
- Sharpening is convolution-based (3×3 kernel per pixel), so on a 12 MP image it takes 200-400 ms - noticeable on a slider drag. We debounce the live preview to 350 ms so the result updates only after you stop moving the slider.
- Can I reset to the original?
- Yes - drop the slider to 0 (or whichever value means 'no change' for this control) to see the original. The source is never modified - the tool always operates on a copy.
- Can I stack multiple adjustments?
- In this widget, one slider at a time. For stacked edits (e.g. brightness + contrast + saturation), use our AI editor where multiple adjustments live side-by-side as non-destructive layers.
Related free tools
Photo Contrast
Push or pull contrast with a single slider. Right for punchier highlights and shadows, left for a flatter, softer look.
Photo Brightness
Brighten or darken any photo with a fine-grained slider. Drag right to lift, left to deepen. 100% browser-side, instant preview.
Drama Filter
Crank up the cinematic intensity: bold contrast, deeper shadows, slightly desaturated palette. Without going full B&W noir.
Compress Image Online
Shrink your photo's file size without losing visible quality. Compare before/after sizes in real time. Browser-side, no upload.
Need more than just sharpen image?
Our AI editor goes way beyond simple transforms - background removal, style transfer, upscaling, photo-to-anime, and 50+ more AI tools. First 5 edits are on us.
Open AI editor - 5 free credits