Blur Images Free - Blur Photos, Censor Faces & Areas Online

Gaussian blur (the most common) creates smooth, natural-looking blur for faces, backgrounds, and censoring - it spreads pixels evenly in all directions. Use 5-15px for subtle background blur, 20-40px to moderately obscure faces or text, 50-100px for complete censoring where content must be totally unreadable.

Yes - draw or select specific areas to blur while keeping the rest sharp. Paint over faces, text, or license plates with a brush, then apply blur only to those regions. For portrait-style background blur, invert the selection to blur everything except the subject. Control brush size for precision.

No - blur is permanent and irreversible once applied and saved. Gaussian blur destroys original pixel data by averaging surrounding pixels - the original detail is mathematically lost and cannot be recovered. For sensitive content, use at least 30px radius to ensure it is truly unrecognizable. Always keep a backup of the original before applying blur.

Use moderate blur (15-30px) to obscure explicit details while keeping general shapes and colors recognizable - suitable for thumbnails where the full image requires a click. Use 40-60px to fully censor content in medical or educational contexts. Selective blur works best - blur only specific areas rather than the entire image.

Blur only affects the selected area - unblurred portions retain original quality and sharpness. Full-image blur preserves dimensions but visual detail is lost in blurred regions. Feather the selection edge (5-10px) for natural-looking transitions - hard edges look artificial. Export as PNG for lossless output or high-quality JPG to avoid compression artifacts.

Yes, completely private - all blur processing runs locally in your browser using JavaScript and HTML5 Canvas. Your images are never uploaded to any server. This matters for privacy tasks: blurring sensitive content via a cloud tool would send those images to a server, defeating the purpose. The tool works offline once loaded.