Sharpen Image
Sharpen blurry photos using an unsharp mask. Adjustable amount and radius, instant preview, browser-based.
Drop an image or click to browse
JPEG, PNG, WebP supported
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What Is Image Sharpening?
Image sharpening enhances edge contrast to make a blurry or soft photo appear crisper and more detailed. This tool uses an unsharp mask — the classic technique that subtracts a blurred version of the image from the original to amplify edges. The Amount slider controls sharpening strength; the Radius slider controls how wide the edge halo is. All processing is done locally in your browser.
How to Use
- Drop or select a JPEG, PNG, or WebP image
- Adjust the Amount slider (sharpening strength, 0–200%)
- Adjust the Radius slider (edge detection width, 1–10 px)
- Compare original and sharpened previews side by side
- Click Download to save the result
Features
- Unsharp mask algorithm — the industry-standard sharpening method
- Adjustable amount (0–200%) and radius (1–10 px)
- Real-time before/after preview side by side
- Preserves original image format and dimensions
- 100% browser-based — your image never leaves your device
FAQ
What is an unsharp mask?
Despite the name, unsharp masking increases sharpness. It works by subtracting a blurred (unsharp) copy from the original, then adding the difference back scaled by the Amount factor. This amplifies transitions between light and dark areas, which our eyes perceive as sharper edges.
What Radius value should I use?
For fine details (text, small objects), use Radius 1–2. For portraits or landscapes, try 2–4. Higher radii create a more pronounced halo effect. Start low and increase until the result looks natural.
Can over-sharpening damage the image?
Yes. Too high an Amount or Radius causes halo artifacts around edges and amplifies JPEG noise. If you see white outlines or grainy edges, reduce Amount or Radius. The download always re-encodes at 92% quality, so keep the original file if you need to re-apply with different settings.