Blur & Mosaic Image
Drag a box over any part of a photo to mosaic, blur or black it out before sharing.
Redaction & masking Client-side Canvas pixel processing
Tool preview
How to use it
- 01
Drop an image.
- 02
Drag on the preview to select the area to hide.
- 03
Pick an effect and press Apply, then download.
Limitations
- ! One region per run — apply again for a second area.
- ! Highly compressed JPEGs can still leak shapes through heavy mosaic; use the black fill for legal documents.
FAQ
Is the mosaic reversible?
Heavy pixelation is lossy, but treat it as best-effort: for ID numbers use solid fill, which cannot be reversed.
Can I hide several faces at once?
Not on this page; run the tool once per region, or use the batch tool with a fixed region.
Does the image get uploaded?
No. Pixelation happens on a canvas in your browser.
Files never leave your device
Processing happens in your browser using the File API, WebAssembly and Web Workers. There is no upload endpoint.
Technical details
- Processing
- Client-side
- Implementation
- Canvas pixel processing
- Category
- Redaction & masking
- Network requests
- None while processing