Local edge enhancement
Sharpen Image Online
Increase edge contrast in a soft photo with a precise strength slider, instant preview, and watermark-free PNG export.
Your image stays on your device; processing happens in this browser.
How to use the image sharpener
- STEP 1Choose a browser-supported image.
- STEP 2Adjust the sharpening strength while checking the preview.
- STEP 3Download the result as a full-resolution PNG.
About this tool
The image sharpener applies a convolution filter to nearby pixels, emphasizing local contrast around edges while preserving the original dimensions and alpha channel.
Moderate sharpening works best after resizing or on slightly soft images.
For portraits and noisy low-light photos, use a lower setting to avoid emphasizing grain or skin texture.
Frequently asked questions
Can sharpening fix an out-of-focus photo?
Sharpening can improve edge contrast and perceived clarity, but it cannot restore detail that the camera never captured.
What strength should I use?
Start around 25–50% and inspect fine edges. Excessive sharpening can create halos and visible noise.
Is the original image changed?
No. The tool creates a separate PNG and leaves the source file untouched.