Pixelate Image Online

Censor faces, license plates, or sensitive info with adjustable pixelation. Lossless PNG output, runs in your browser — the un-censored image never leaves your device.

How to pixelate an image online

Drop a JPG, PNG, WebP, or GIF onto the upload area. ToolChop downsamples the image to a tiny canvas, then re-upscales it with nearest-neighbor (no smoothing) to produce crisp blocks of solid color. Use the Pixel size slider to control how chunky those blocks are — 5–10 for a smooth mosaic, 30+ to fully obscure faces or license plates. Click Download pixelated PNG when you are happy with the result.

Pixelation is privacy — keep the source local

The reason you pixelate an image is almost always to redact something before sharing it: a face, a license plate, an address, a screenshot of internal data. Uploading the un-censored original to a third-party site first completely defeats that purpose. ToolChop runs the pixelation in your browser so the un-redacted image never leaves your machine.

Pixelation vs blur — why pixelation wins for redaction

Blur averages pixels across a soft kernel; the result is a smooth gradient that can sometimes be partially reversed by sharpening or deconvolution attacks. Pixelation snaps every pixel in a block to one solid color — the underlying detail is mathematically destroyed and cannot be recovered. For redacting identifying information, always prefer pixelation (or, better still, a solid black box).

What you can do

Pixel size from 2 (very subtle) to 64 (heavy censor)
Quick presets: Subtle, Mosaic, Censor
Output at original image dimensions — no resampling artifacts
Lossless PNG download preserves block edges exactly
Works with JPG, PNG, WebP, and the first frame of GIFs

Frequently asked questions

How do I pixelate an image online for free?

Drop your image onto the upload area. Drag the block-size slider to control how chunky the pixels are — 5–10 for a smooth mosaic, 30+ to fully obscure faces or license plates. Click Download pixelated PNG. No account, no upload, no daily limit.

Does ToolChop upload my image?

No. Pixelation runs entirely in your browser via the Canvas 2D API — the image is decoded, downsampled, and re-rasterized locally. The file never leaves your device. That is essential when you are censoring screenshots that contain personal data, customer faces, or internal information.

Will the pixelated areas survive someone trying to un-pixelate them?

Yes — proper pixelation is irreversible. Once the image is downsampled (each block averaged to one color) and re-upscaled, the underlying detail is mathematically destroyed. There is no algorithm that can recover the original pixels because the information is gone. This is unlike a Gaussian blur, which can sometimes be partially reversed.

How do I pixelate only a face or license plate, not the whole image?

Two-step workflow: crop the area you want to pixelate using our Image Cropper, pixelate that crop here, then composite it back over the original in any image editor. We are intentionally keeping ToolChop's pixelator simple and full-image — region masking is better handled by dedicated photo editors.

What block size should I use to censor a face?

For a face that is about 100 pixels wide in the image, use a block size of 20–30. This leaves roughly 3–5 blocks across the face — enough to destroy the identity but not so much that the rest of the image is unrecognizable. License plates usually need 10–20.

What block size should I use for a retro 8-bit look?

5–8 produces a chunky mosaic that still preserves the image content. 12–20 starts to look like NES-era pixel art. Above 30 the image becomes a color-block abstraction rather than a recognizable picture.

Why is the result downloaded as PNG instead of the original format?

PNG is lossless, so the pixel blocks come out crisp and exact. If you re-save as JPEG, the lossy compression smears the hard block edges and partially defeats the pixelation. PNG preserves the censoring exactly as you see it on screen.

Does the output keep the original image's dimensions?

Yes. The pixelation is performed by downsampling to a small canvas and then upsampling back to the original dimensions with nearest-neighbor (no smoothing). The output PNG has the same pixel dimensions as your source image.

Can I pixelate animated GIFs?

Only the first frame. Animated GIF pixelation requires decoding each frame, pixelating it, and re-encoding the animation — much heavier work that the browser's Canvas API does not handle natively. For now, drop a GIF and you will get a pixelated PNG of frame 1.

Is there a file size or resolution limit?

Only your browser's memory. Modern Chrome can pixelate 50-megapixel images without trouble. The pixelation itself is very fast because the heavy work is on a tiny downsampled canvas — most of the time is spent loading and re-encoding the full-resolution PNG.

Why does this look different from a Gaussian blur?

Pixelation and blur are different operations. Blur averages pixels across a smooth kernel — it softens detail but leaves a gradient. Pixelation snaps every pixel in a block to one solid color, producing hard-edged squares. Blur can sometimes be partially reversed; pixelation cannot.

Why use ToolChop instead of an online pixelator that uploads my screenshot?

The whole point of pixelation is privacy — censoring faces, license plates, or sensitive data before you share an image. Uploading the un-censored original to a third-party server first directly contradicts that goal. ToolChop runs the pixelator in your browser so the un-censored image never leaves your machine.