Pixelate Image

Apply a mosaic/pixelate effect to a whole image or a drawn area.

Drop an image here or click to choose a file

Processed on your device — never uploaded

What Is This Tool?

This tool divides the image (or a chosen rectangle) into square blocks and fills each block with its average colour, producing a mosaic. Large blocks are an effective, irreversible way to censor faces or text; small blocks give a stylised retro effect.

How It Works

Drop an image onto the box or choose one.

Set the Block size.

For a censor bar, tick Pixelate only a drawn box and drag over the area.

Click Download PNG.

Everything runs locally in your browser — the image you choose is decoded onto an HTML canvas on your own device and is never uploaded to a server.

Features

Whole-image or area pixelation
Adjustable block size
Irreversible censoring in the exported file
Averaged blocks (not just nearest-neighbour)
Runs in the browser

Common Use Cases

Censoring a face or signature in a photo
Hiding an address or ID number in a screenshot
Creating 8-bit style artwork
Anonymising bystanders in a street photo

Frequently Asked Questions

Is pixelation reversible?

No. Averaging a block permanently discards the detail within it. As with blur, larger blocks are safer for sensitive content.

Pixelate or blur for censoring?

Both bake into the file. Pixelation with a large block size tends to look more deliberate and leaves less residual structure than a light blur.

Why does a small block size barely do anything?

A 2–3px block is close to the original resolution. Increase it until the detail you want to hide is gone.

Does it keep the image dimensions?

Yes. Only the pixel values change.

Is anything uploaded?

No, it is processed locally.