Pixelate Images Online

Pixelating an image on this page is a short loop: drop the file, set the block size, and download. The tool accepts JPG, PNG, and WebP files up to 50 MB and applies the mosaic effect in your browser with the Canvas API, so nothing is uploaded. The block size slider controls how coarse the effect is, from a subtle grain to large blocks that hide detail entirely. This is the standard way to censor a face, hide a license plate, or give a photo a retro pixel-art look.

1. 1Drop or select an image. JPG, PNG, and WebP files up to 50 MB are accepted.
2. 2Drag the block size slider. Smaller blocks give a subtle grain, larger blocks hide more detail.
3. 3Set the quality if you are saving as JPG or WebP. PNG is lossless, so the slider is hidden.
4. 4Download the pixelated image. Your original file is never modified.

Pixelation breaks the image into a grid of solid-color blocks, the classic mosaic or censored look. Each block becomes a single flat color taken from the area it covers, so fine detail inside the block is averaged away. The block size slider gives you the full range between a subtle grain and a heavy mask.

• Small blocks, around 4 to 8 pixels: a subtle grain that softens the image without hiding it.
• Medium blocks, around 12 to 20 pixels: strong enough to hide faces and text.
• Large blocks, 20 pixels and up: heavy squares that hide detail entirely, or a bold retro-art look.

The image is first downscaled to one pixel per block, which averages each block of the original into a single color. It is then upscaled back to full size without smoothing, so the colors stay as crisp, flat squares instead of blending into each other. That two-step process is what produces the sharp block edges of the classic mosaic look. The whole operation runs locally in your browser.

Yes, with the right block size. A block size of 12 to 20 pixels makes faces unrecognizable while still looking intentional rather than accidental. For stronger privacy, push the slider higher so each block covers more of the face. Because the effect is irreversible, this is a reliable way to anonymize a photo before sharing it, since the detail inside the blocks cannot be recovered from the output.

Once detail is averaged into blocks, the original pixels are gone from the output, and there is no way to recover them from the downloaded file. The only way back is the original, which the tool leaves untouched on your device. Treat the pixelated file as final, and keep the source if you may need the clean version later.

The output keeps the format of the source file: a JPG stays a JPG, a PNG stays a PNG, and a WebP stays a WebP. The quality slider applies to JPG and WebP output and is hidden for PNG, because PNG is lossless. When the output is JPG, transparent areas are filled with white. Large blocks flatten the image into fewer distinct colors, so lossy output sometimes compresses smaller than the original, but the effect itself is the point, not the file size.

Every image on this page is processed by the Canvas API inside your browser. Nothing is uploaded, no account is required, and there is no queue. That makes pixelation a safe way to censor faces, plates, or documents without ever handing the unedited file to a third-party service. The result is usually ready in under a second, since the whole operation runs locally.