Free Image Blur Tool - Blur Photos, Censor Faces & Sensitive Info

Gaussian blur is the most common - creates smooth, natural-looking blur for faces, backgrounds, or censoring. It spreads pixels evenly in all directions. Use low intensity (5-15px) for subtle background blur in portraits, medium (20-40px) for moderately obscuring text or faces, and high (50-100px) for complete censoring where information must be totally unreadable. Box blur (simpler algorithm) creates slightly more angular blur but processes faster on large images.

Yes, selective blur lets you draw or select specific areas to blur while keeping the rest sharp. You paint over areas you want blurred (faces, text, license plates) using a brush tool, then apply blur only to those regions. This is perfect for censoring specific information without affecting the entire image. For portrait-style background blur, you can 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 the original pixel data by averaging surrounding pixels. There is no "unblur" function because the original detail is mathematically lost. This is why blur is effective for censoring - it cannot be undone or enhanced to reveal hidden information. Always keep a backup of the original unblurred image if you might need it later. Once you download the blurred version, the original data is gone from that file.

For NSFW thumbnails, use moderate blur (15-30px radius) that obscures explicit details but maintains general shapes and colors so viewers understand the subject matter. Too little blur looks unprofessional, too much makes the image unrecognizable. Selective blur works best - blur only explicit areas rather than entire image. Keep composition, colors, and overall subject visible for context.

Blur only affects the selected area - unblurred portions remain at original quality and sharpness. However, the blur transition edge might show a slight gradient boundary. For full-image blur, all resolution is preserved (a 4000x3000 photo stays 4000x3000), but detail and sharpness are obviously lost in blurred regions. Blur does not reduce megapixels or dimensions. When exporting, choose PNG for lossless output or high-quality JPG (90%+) to avoid introducing compression artifacts around blur boundaries.

Yes, completely private. All blur processing happens locally in your browser using JavaScript and HTML5 Canvas. Your images are never uploaded to any server, never transmitted over the network, and never stored or logged. This is especially important if you are blurring sensitive, private, or NSFW content - it stays entirely on your device. You can even use this tool offline. Your original and blurred images remain confidential.