Pixelate Image
Blur an image into rectangular colour blocks of a size you control, from subtle texture to bold mosaic.
How it works
- 1
Drop any image onto the upload area. PNG, JPEG, WebP and most other browser-supported formats are accepted.
- 2
Use the Block size slider to control how large each mosaic square is — 2 is almost imperceptible, 64 gives a bold blocky look.
- 3
Choose an output format, then click Pixelate to download the result. The tool replaces each block with its average colour, so edges within a block are intentionally lost.
Questions
How does the pixelation work?
The image is divided into non-overlapping square blocks of the chosen size. Each block's red, green and blue channels are averaged, and every pixel in the block is then set to that average colour. Pixels at the right and bottom edges that do not fill a complete block are averaged together as a smaller partial block.
Can I use this to censor sensitive areas?
Yes, this is a common use. For strong censoring, use a block size of 20 or larger. Keep in mind that pixelation is not a reversible operation — the original detail cannot be recovered from the output — but for truly sensitive data you should consider a more robust redaction method.
Is transparency preserved?
Yes. The alpha value of each pixel is kept as-is; only the colour channels (RGB) are averaged within each block.
What is the block size range?
The slider goes from 2 to 64 pixels per side. Values below 2 would have no visible effect, so 2 is the minimum. Very large blocks on a small image may produce only a handful of distinct squares.
Does the image get uploaded anywhere?
No. The pixelation runs entirely inside your browser using your device. Your file is never sent to a server.
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