Pixelate Image

Apply a blocky mosaic effect with adjustable block size. Runs entirely in your browser.

Pixelate an image

Upload an image, then drag the slider to set the pixel block size. The preview updates instantly.

Drag & drop an image here, or click to browse
Supports JPG, PNG and WEBP.

    Preview

    Live preview
    Your image is processed locally in this browser tab using the Canvas API. It is never uploaded to Calcooo or any server.

    How to use this tool

    1. Drag and drop an image into the box above, or click to browse and select one.
    2. Drag the Pixel block size slider to set how blocky the effect should be.
    3. Check the live preview — it updates instantly as you move the slider. Use Reset to return to the default size.
    4. Click Download image to save the result.

    FAQ

    Frequently asked questions

    Is my image uploaded anywhere when I pixelate it?

    No. The pixelation effect is applied locally in your browser using the Canvas API. It never leaves your device.

    Why would I pixelate an image?

    Pixelation is commonly used to obscure faces, license plates, or sensitive text while keeping the general shape visible.

    What does block size control?

    A larger block size means bigger, blockier pixels and a more obscured result; a smaller block size gives a more subtle effect.

    Can I pixelate just part of the image?

    Not with this tool — it applies pixelation to the whole image.