How to Pixelate an Image (and When Not To)

One important caveat: pixelation is a stylistic effect, not a reliable way to hide sensitive information. More on that below.

Pixelation vs Blur vs Low Resolution

These effects are often confused:

Pixelation is the only one with deliberately crisp, visible blocks, which is why it's associated with retro games and TV censorship.

Choosing a Block Size

The right block size depends on the image size and what you want people to see:

• Small blocks (4–8 px) give a subtle pixel-art texture; the subject stays clear.
• Medium blocks (10–20 px) make a strong stylised effect; shapes are recognisable, details aren't.
• Large blocks (30 px and up) reduce the image to colour patches.

Block size is relative: 12-pixel blocks on a 4,000-pixel-wide photo are subtle, while on a 400-pixel image they're dramatic. Resize first if you're aiming for a particular look.

Method 1: Pixelate an Image Online

The low quality image maker has a Pixelated preset and a pixelation slider:

1. Upload a JPG, PNG or WebP image.
2. Pick the Pixelated preset, or open Advanced Controls and move the Pixelation slider.
3. Optionally reduce the colour count for a retro palette, or lower the resolution for a chunkier look.
4. Download as PNG to keep block edges perfectly sharp. Saving as JPEG adds compression smudges inside and around each block.

It runs in your browser, so the image stays on your device.

Method 2: Pixelate in an Image Editor

• Photoshop: Filter → Pixelate → Mosaic, then set the cell size.
• GIMP: Filters → Blur → Pixelize, then set block width and height.
• Photopea (free, in the browser): Filter → Pixelate → Mosaic.

Editors let you pixelate only a selection, for example the background of a photo.

Method 3: The Resize Trick

Pixelation is essentially "make it smaller, then make it bigger without smoothing":

1. Resize the image down to, say, 5% of its width.
2. Resize it back up to the original size using Nearest Neighbor interpolation.

With bilinear or bicubic interpolation you'd get blur instead of blocks. The same idea is why tiny thumbnails look blocky in some apps and blurry in others; why images look blurry or pixelated explains this.

Method 4: On a Phone

Phone galleries rarely include a pixelate filter, but some markup and editing apps do. A browser-based tool works on any phone without installing an app: open it, upload from the camera roll, adjust and download.

Why Pixelation Isn't Safe for Hiding Information

It's tempting to pixelate a password, number plate, document or face before sharing a screenshot. The problem is that pixelation keeps an average colour for each block, and that's information:

• Text can be reconstructed. Researchers and open-source tools have shown that pixelated text, especially in a known font and size, can often be recovered by testing candidate text, pixelating it the same way and comparing the blocks.
• Faces can be matched. Large blocks still preserve skin tone, hair colour and layout, which may be enough to identify someone who's known.
• Small blocks barely hide anything. A light pixelation is often readable just by squinting or viewing the image small.

For anything sensitive, cover it with a solid, opaque box, and make sure you export a flattened image rather than a file where the box is a separate, removable layer. Cropping the area out entirely is even safer.

Creative Uses Where Pixelation Shines

• Retro and 8-bit graphics for posters, thumbnails and game-themed designs.
• Pixel-art starting points: pixelate a photo, reduce colours, then hand-tune the result.
• Abstract backgrounds from colourful photos.
• Stylised transitions in videos, where an image pixelates in and out.

If you'd rather simplify an image into bold shapes for crafts, a picture stencil maker gives a different kind of abstraction. For all-round "bad image" effects, see how to make an image look low quality.

Summary

Pixelation averages square blocks and enlarges them without smoothing. Use it for retro and stylised looks, save as PNG to keep it crisp, and use solid boxes, not pixelation, to hide anything sensitive.