How to pixelate an image

Pixelation turns a photo into big, chunky squares — each square becomes one solid color, so fine detail disappears and the picture looks like a mosaic or an old video game. It is the classic way to hide a face, a number plate, or private text in a screenshot before you share it, and it is also a style in its own right: the retro, 8-bit look that shows up in avatars, posters, and social media posts. The steps below pixelate any photo in your browser on ImageTool.us, with no upload and no signup.

1. Step 1: pick a photo and keep the original

Start with the photo you want to pixelate — any common format works (JPG, PNG, or WebP). Keep a clean copy of the original before you begin: pixelation replaces the detail in the downloaded copy, and it cannot be undone from that file. The original on your device is never changed; the tool only makes a new pixelated copy for you to download.

2. Step 2: open the tool and upload your photo

Open the Pixelate Image tool and upload your photo — click to choose it, or drag and drop it onto the page. The original appears in the preview on the left. Nothing is uploaded: the file stays on your device and the work happens in your browser.

3. Step 3: set the block size

The Block size slider runs from 4 to 64 pixels and starts at 16 pixels. The number is the size of each square in the result: a block of 4 pixels is tiny, so the image stays mostly recognizable; a block of 64 pixels is huge, so the image becomes a few big colored squares and almost nothing can be read. For a first try, leave it at 16 — that is a clear pixel look that still shows what the photo is. For a subtle retro style, pull it down toward 4–8 pixels. For hiding a face or text, push it up toward 32–64 pixels and check the result zoomed in before you share it.

4. Step 4: click Pixelate Image and save

Click Pixelate Image. The result appears next to your original so you can compare them before saving. If the blocks are too small to hide what you wanted, move the slider up and click again — the tool always starts from your original, so each try is fresh. When you are happy, tap Download below the result to save the new copy — it is called pixelated.png. The result is always saved as a PNG, which keeps the square edges sharp.

What pixelation actually does

The tool shrinks your photo down to a tiny grid, then stretches that grid back up to the original size without smoothing. Each tiny cell becomes one flat square of color, so all the detail inside that square is gone — a face becomes a few blocks of skin tone, a line of text becomes a row of gray squares. That is the whole effect: detail is replaced by blocks, and the bigger the blocks, the less information survives. It is simple and honest — there is no hidden trick, and nothing about the photo is recovered afterward.

Small blocks or large blocks — which to choose

Small blocks (4–8 pixels) keep the image recognizable and give a light retro or 8-bit game feel — good for avatars, posters, and social posts where you want the style, not the hiding. Medium blocks (12–24 pixels) make the photo clearly pixelated while still showing its general shape and colors — good for a strong retro look or for hiding background detail. Large blocks (32–64 pixels) destroy most detail: faces, plates, and text become unreadable blobs — that is what you want when privacy matters. If you are unsure, start at 16 and work up: it is easier to add more hiding than to wish you had hidden less. And always check the result at full size, zoomed in — a block size that looks safe in a small preview can still leave a face or a word readable when the image is opened large.

When to pixelate a photo

Pixelate faces of people who did not agree to be in a shared photo, number plates on cars, addresses or account numbers on documents, and private text in screenshots — messages, emails, and order confirmations you want to post without showing the details. It also works as a style: a pixelated portrait makes a fun avatar, and a pixelated landscape makes a retro poster. For anything truly sensitive, use a large block size and check the result zoomed in — small blocks can still leave a face or text recognizable.

Pixelate the whole photo or only one area

This tool pixelates the whole image — every part of it gets the same blocks. That is the right choice when the whole photo needs the effect, or when you want the retro look across the entire picture. But sometimes only one part needs hiding: one face in a group photo, or one number plate, while the rest of the photo should stay clean. For that, use the Batch Blur & Pixelate tool instead — there you place boxes exactly over the faces or plates you want to hide, and the rest of the photo stays untouched. If you only need a soft hide rather than blocks, the Blur Image tool softens the whole photo, and the Blur Background tool keeps your subject sharp while blurring the background behind it.

Combine pixelation with other effects

Pixelation pairs well with the retro effects on ImageTool.us. Add Film Grain after pixelating for an old-game, worn-poster feel — the grain breaks up the flat squares with a little texture. Or pixelate first, then shrink the result with the Image Compressor before sharing, since a pixelated photo compresses well and stays small. For a different retro style entirely, try the Photo to Pencil Sketch tool — it turns a photo into a drawing instead of blocks. And if the photo needs a quick fix before you pixelate it, the Image Editor handles cropping and rotating first. Whatever you combine, pixelate from the clean original each time: pixelating an already-pixelated copy only makes the blocks bigger, it does not add detail back.

Honest limits

• Pixelation is not real anonymization against a determined person. It hides detail, but a very high-resolution original can still leak shapes — a face outline, a car color, the rough length of a word. For anything truly sensitive, use the largest block size and check the result zoomed in, or do not share the photo at all.
• It cannot be undone from the downloaded file. The blocks replace the detail in the new copy, so keep your original if you may want the clean photo later.
• Large blocks destroy text and fine detail completely. A street sign, a small label, or a distant face will not survive 32–64 pixel blocks — that is the point for hiding, but it is a loss if the detail mattered.
• The result is never sharper than the original. Pixelation removes information; it does not add any. A small, low-resolution photo stays small and low-resolution, just blockier.
• It does not remove the photo's metadata by itself. If you need to strip location or camera details from a file before sharing, use the EXIF Viewer & Stripper tool on the result.

Common mistakes

• Using a small block size to hide a face and sharing it anyway — at 4–8 pixels a face can still be recognizable when the image is opened at full size. For hiding, use 32–64 pixels and check zoomed in.
• Pixelating a screenshot of text at a low setting and assuming the words are unreadable — text survives small blocks surprisingly well. Use large blocks, or blur the text area instead.
• Deleting the original after pixelating — the detail is gone from the new copy, so keep the original if you may want it later.
• Pixelating an already-pixelated copy to "hide more" — the second pass starts from the blocky copy, so the blocks just get bigger and the image gets worse. Go back to the original and use a larger block size instead.
• Forgetting the metadata — pixelation hides what the photo shows, but the file can still carry location and camera details. Strip those separately if they matter.

Quick checklist

• Original clean copy kept before pixelating.
• Block size set: 4–8 pixels for a subtle retro look, 16 pixels to start, 32–64 pixels for hiding faces and text.
• Result checked at full size, zoomed in — face or text actually unreadable if that was the goal.
• Downloaded as pixelated.png (PNG, so the square edges stay sharp).
• Only one area needs hiding? Use Batch Blur & Pixelate instead, so the rest of the photo stays clean.
• Metadata stripped separately if the file will be shared publicly.

Your images never leave your device on ImageTool.us: every tool runs entirely in your browser. No upload, no signup, no watermark.