Pixelate an Image Online (Mosaic Effect)

Blur or pixelate selected parts of a photo by drawing rectangles over them — locally in your browser.

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Drag & Drop Image Here

or Click to Browse files

Censoring mode

Blur strength

Pixel block size

16 px

Processing... 0%

Loading image pixels

Mapping selected regions

Applying censor effect

Compositing result

Encoding output

Result

This page opens the blur tool with the pixelate mode already selected — drop in your photo, drag rectangles over the areas you want to turn into mosaic and download the result.

Pixelation replaces each block inside your selection with its average color, producing the classic censor mosaic. The block size slider controls how coarse the mosaic is: small blocks soften details, large blocks make text and faces completely unreadable. You can also pixelate the whole photo with one click for a retro low-resolution effect.

Prefer a smooth haze instead of squares? Switch the mode to blur in the same tool. Everything runs locally in your browser, so your photos never leave your device.

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Executed in Browser

Your files and inputs never leave this device. Processing runs completely offline. 100% Secure.

Accepted Formats & Rules

Draw any number of rectangular regions with the mouse or a finger, with a removable region list.
Two censoring modes: blur with adjustable strength or pixelate with adjustable block size.
One-click button to select the entire photo, plus an honest live preview of the final effect.

Key Benefits

✓ 100% Client-Side: the photo is censored entirely in your browser and never uploaded anywhere.

✓ You stay in control: you draw every region yourself, so exactly what you mark gets hidden — no guesswork.

✓ Real pixel effects: multi-pass box blur and true mosaic pixelation are baked into the downloaded file.

Use Cases

• Do you need to blur a stranger's face or your child's face before posting a photo publicly?
• Do you want to pixelate a license plate, an address or a name on a photo or screenshot?
• Do you need to censor account numbers or private messages on a screenshot before sharing it?