Blockify an Image
Average the image into large square blocks for a mosaic look. Runs entirely in your browser, so your data never leaves your device.
Drop a file here, or click to browse
Files never leave your device
Output
The result appears here as you type.
How to use Blockify an Image
- 1. Load the image. Drop a photo or graphic into the input pane. Any format works, and strong shapes with clear color regions survive blockification most recognizably.
- 2. Pick a Block size. Set Block size in pixels to control the grid. At 8 the image stays clearly readable with a pixelated flavor, at 20 it becomes chunky abstraction, and at 50 only broad color masses remain.
- 3. Download the blocky version. Each square block is filled with the average color of the pixels it covers, so the palette stays true to the original. Check the preview at intended display size, then save.
When to use Blockify an Image
Blockify an Image averages a picture into a grid of large flat squares, trading detail for graphic boldness. It is a creative pixelation effect, a fast way to abstract an image for backgrounds and puzzles, and a practical trick for making a photo unrecognizable while preserving its overall color composition.
- Guess-the-image games. A heavily blockified movie still or album cover makes a great quiz round. Post the 40 pixel version first, then progressively smaller block sizes as hints until someone gets it.
- Abstract backgrounds from photos. A blockified sunset or cityscape becomes a color-true abstract texture for slide backgrounds and hero sections, carrying the mood of the original without competing with foreground text.
- Pixel-art reference grids. Artists translating a photo into pixel art can blockify at their target resolution to see which color each cell should average to, effectively generating a paint-by-number reference.
- Obscuring content while keeping context. When a screenshot's layout matters but its content should not be readable, blockifying the whole image communicates the structure and palette without exposing any actual text.
Examples
20 px blocks
Input
photo.jpg + block size 20
Output
chunky, blockified image
About the Blockify an Image tool
Blockify an Image runs as plain JavaScript in your browser tab, with no server behind it. Average the image into large square blocks for a mosaic look. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's Image Tools section, 200 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
You can shape the output with the Block size (px) setting, and the result refreshes the moment you change it. The finished file is put together in browser memory and saved with the Download button, so it never touches a server on the way to your disk. A worked example further down the page shows exactly what the tool produces for a real input.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Does Blockify an Image cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Are my files uploaded to a server?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
Which files does Blockify an Image accept?
It accepts images in any common format (PNG, JPG, WebP, GIF and more). There is no file size cap imposed by a server; very large files are limited only by your device's memory.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I save the output?
Click the Download button once the result is ready. The file is built in your browser's memory and handed straight to your downloads folder, without passing through a server.