Pixelate Image Online Free — Mosaic & Pixel Art Effect
Apply a pixelation mosaic effect to any photo — adjust block size from subtle to full 8-bit retro pixel art. Useful for censoring, creative effects, and pixel art. Free, instant, runs in your browser.
✓ Free · ✓ No upload · ✓ Works offline in your browser
Drop image here or click to upload
JPG, PNG, WebP — processed locally in your browser
Pixelate vs Blur — Which to Use?
Pixelate (Mosaic)
Divides the image into visible color blocks. Retains the general color pattern of the original. Great for censoring, retro aesthetics, and pixel art effects. Block edges are hard and geometric.
Gaussian Blur
Smoothly blends neighboring pixels together. Produces a soft, out-of-focus look. Better for background defocusing and subtle detail reduction. No visible grid structure.
For privacy censoring, pixelation is generally more secure than blur — a strong enough Gaussian blur can sometimes be mathematically reversed, while mosaic pixelation is not reversible.
Frequently Asked Questions
How do I pixelate an image online?
Upload your photo above, drag the Block Size slider to set how large each pixel block should be, then click Pixelate Image. Download the result instantly as a PNG. The entire process runs in your browser — nothing is uploaded to a server.
How does the pixelation effect work?
The tool divides the image into a grid of square blocks based on your chosen block size. For each block, it samples the average color and fills the entire block with that single color. Smaller blocks preserve more detail; larger blocks create a stronger mosaic effect.
How do I pixelate a face or sensitive area in a photo?
Upload the image, set a block size of 15–30 pixels, and download. For selective pixelation (only the face), use an image editor like Photoshop or GIMP after downloading — this tool applies the effect to the entire image. Full-image pixelation is useful for creating stylized censored versions.
What block size should I use for pixel art?
For a retro 8-bit pixel art look, use a block size of 10–20 pixels on a large source image. The higher the source resolution, the larger the block size you can use while still preserving recognizable shapes.
Can I use this to censor or blur sensitive content?
Yes. Pixelation is a common censoring technique that obscures recognizable details while preserving the general shape of an object. Use a block size of 20–40 pixels for strong censoring.
Is my image uploaded to a server when I pixelate it?
No. The pixelation is performed entirely using the HTML Canvas API running locally in your browser. Your image never leaves your device.