Pixelate & Censor

Pixelate samples the average colour of each block and fills it as a flat square — the classic large-pixel censoring effect seen on TV.

Mosaic does the same but draws each block with a subtle border between tiles, giving it a tiled mosaic art look rather than pure pixels.

Solid Block fills the entire selected region with a single flat colour of your choice — the most complete censor, leaving no visual information at all.

Yes — each time you draw a selection and release, the effect is applied immediately and becomes permanent on the canvas. You can then draw another region on the updated image. Use the Undo button to step back one region at a time. There is no limit to how many regions you can censor.

For privacy purposes such as hiding a face or license plate, a block size of 16 or higher is recommended — smaller blocks can sometimes be reconstructed. For a decorative pixel art effect, smaller block sizes (4–8) create a finer mosaic pattern. The block size applies to the full-resolution image, so the effect will look proportionally smaller on large photos.

All processing happens in your browser — your image is never uploaded to any server. The Solid Block censor provides the strongest privacy guarantee since it replaces pixels with a flat colour, leaving no recoverable information. Pixelate and Mosaic effects at small block sizes could theoretically be partially reversed with sophisticated software, which is why we recommend a block size of 16+ for sensitive content.

Yes — you can switch between Pixelate, Mosaic, and Solid Block between each region you draw. For example, you could pixelate a face, then use a solid black block on a license plate, all on the same image. Each region is applied independently as you draw it.