Sharpen Image — Frequently Asked Questions
Everything you need to know about using Sharpen Image.
How does the sharpening filter work?
It applies a 3×3 convolution kernel that emphasizes pixel differences against neighbors — making edges and details more visible. Intensity controls how strongly the effect is applied.
Is my image uploaded?
No. The entire sharpening happens in your browser using Canvas pixel processing. Your photo never leaves your device.
Can it fix a totally blurry photo?
No. Sharpening enhances detail that already exists. If a photo is completely out of focus, sharpening will reveal what’s there but won’t reconstruct missing detail. For genuinely blurry shots, AI-based unblur tools work better.
Why does my sharpened image have halos?
Halos appear when sharpening is too strong — the filter overshoots on contrasting edges. Reduce intensity to fix.
What’s the output format?
PNG — lossless, preserves all the sharpening detail. If you want JPG, run the result through our Image Compressor or Batch Image Converter afterwards.
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