Tiny Online Tools
Image Sharpen Tool
Recover crispness and detail in slightly soft photos using a precise 3×3 convolution sharpening filter. The tool runs entirely in your browser using the Canvas API and applies a classic unsharp-mask style kernel.
How it works
The sharpen filter amplifies the difference between each pixel and its neighbors. With a strength of 1.0 it uses the classic sharpen kernel [0,-1,0; -1,5,-1; 0,-1,0]. Higher strengths progressively widen the edge response, producing more aggressive enhancement.
Use cases
- Crisp up slightly soft phone photos
- Recover detail after resizing or compression
- Enhance product photography for e-commerce listings
- Improve readability of scanned documents and screenshots
- Bring out texture in macro and landscape shots
- Final pass before publishing to social media
Tips
Values 0.3–0.8 give subtle, natural-looking sharpening for most photos. Values 1.0–2.0 are useful for screenshots and documents. Beyond 2.5 the filter starts to create visible halos and noise — useful only for stylized looks.
All processing happens locally — your originals never leave your device. Output is a high-quality PNG.