Unsharp Mask
Sharpen images using the classic unsharp masking technique. Gaussian blur subtraction with adjustable radius, amount and edge threshold.
Unsharp masking subtracts a Gaussian-blurred copy from the original to expose edges, scales that difference with the amount control, and adds it back. The radius sets the blur scale, while the threshold can limit sharpening in low-contrast regions.
How to Use Unsharp Mask
- Upload an image: Upload one of the formats listed by the tool (JPG, PNG, WebP) and wait for the local preview.
- Adjust settings and process: Adjust the available controls, then run the selected image processing workflow in your browser.
- Review and download: Review the result, then download it in one of the formats offered by this tool.
Frequently asked questions
What is unsharp masking?
Unsharp masking sharpens an image by subtracting a blurred copy from the original, scaling that local difference by an amount factor, and adding it back to emphasize edges.
How do I pick the right radius?
Use a small radius (0.5–2.0 px) for detail sharpening on portraits and high-resolution photos. Use a larger radius (3–10 px) to emphasize broader structure rather than fine texture.
What does the threshold do?
Threshold prevents sharpening from amplifying small local differences. Pixels whose local contrast is below the threshold remain unchanged; raise it on noisy photos and keep it at 0 for clean images.
Is the Unsharp Mask tool free?
Yes. All tools on Pixlane are free with no signup required.
Does it reuse cached assets on repeat visits?
Browser caching can speed repeat visits; uncached site assets can still require an internet connection.
What image formats are supported?
JPG, PNG, and WebP are supported.
How is unsharp mask different from the Blur & Sharpen tool?
Blur & Sharpen offers a single-slider quick fix. Unsharp Mask exposes radius, amount, and threshold separately so you can tune fine detail, overall strength, and noise protection for the image at hand.