About the Sharpen Image tool
Rescue slightly soft photos with convolution-based sharpening. Moderate strength adds crispness; higher values create a stylized high-detail look.
Sharpening is computed in your browser. Your photograph is never transmitted and nothing is retained after you close the page.
How to use it
- Add your image.
- Adjust the settings and watch the live preview.
- Download the result.
About the sharpen effect
This applies increased edge contrast to make detail read more crisply.
Worth knowing
Sharpening does not add detail. It increases contrast along edges so that existing detail reads more distinctly — which is a genuine improvement when applied lightly and an obvious artefact when overdone.
The correct order matters: resize first, sharpen last. Sharpening before a resize amplifies artefacts that the resize then locks in.
Where sharpening helps and where it cannot
Sharpening works by increasing contrast in a narrow band along each edge, making one side slightly lighter and the other slightly darker. Your eye reads that increased local contrast as crispness. Nothing new has been added to the image — the existing edges have simply been exaggerated.
That is why it genuinely helps three specific situations: an image softened by downscaling, a photograph taken through a slightly soft lens, and a scan that has lost a little definition. In each case the detail is present but under-defined, and raising edge contrast makes it read properly.
It cannot help a photograph where focus was missed or the camera moved, because there is no edge to enhance — the detail was never recorded. Sharpening such an image produces halos around the blurry shapes and makes the failure more obvious rather than less. The honest answer there is to reshoot.
Common mistakes
- Over-sharpening, which creates bright halos along every edge.
- Sharpening a blurry photo in the hope of rescuing it. Missing focus cannot be recovered.
- Sharpening before resizing rather than after.
Questions people ask
Can sharpening fix a blurry photo?
No. It raises edge contrast but cannot recreate detail the lens never captured.
How much is too much?
If you can see pale outlines along high-contrast edges, you have gone too far.
Should I sharpen before or after resizing?
After. Resizing softens the image slightly, so sharpening is the final step.