Sharpen Image
Bring out fine detail in a photo by applying a convolution-based sharpening filter at adjustable strength.
How it works
- 1
Drop your image and set the sharpening strength. A value around 0.5 recovers detail from slightly soft photos without introducing artefacts.
- 2
The filter interpolates between doing nothing (0) and a full convolution-based sharpen kernel (1), so you can dial in exactly how much edge contrast to recover.
- 3
Click Sharpen image to download the result as a PNG.
Questions
What is the difference between low and high strength?
At low strength the kernel barely differs from the identity matrix, so the result is very close to the original. At full strength, a classic 3×3 sharpen convolution is applied: edges become crisper and fine detail stands out. Avoid values above 0.8 on images that are already sharp, as haloes can appear around high-contrast edges.
Will sharpening fix a blurry photo?
Sharpening enhances edges that are already present — it cannot restore true detail that was never captured. It works well on images that are slightly soft due to camera settings or resizing, but heavily blurred images will show artefacts rather than recovered detail.
Does my image leave my device?
No. All processing runs entirely in your browser. The image is never sent anywhere.
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