Chat screenshots
Paint out the other person's nickname, phone number and transfer amounts.
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Guide
Pixelate is the mosaic panel of the image workbench (?tool=mosaic): press and drag across the canvas and wherever the brush passes turns into a mosaic immediately. Two parameters control the look. “Brush size” decides how wide a single stroke is (10 px up to a third of the image's short side), while “Mosaic block size” decides how large each block is (4–80 px, larger meaning blurrier). Strokes accumulate, and changing the block size re-renders every stroke already painted; “Clear all mosaic” wipes the slate. On export the mosaic is written into the pixels and cannot be reversed. Everything is processed in the browser.
Updated 2026-09-093 min read
Pixelate is the mosaic panel of the image workbench (?tool=mosaic): press and drag across the canvas and wherever the brush passes turns into a mosaic immediately. Two parameters control the look. “Brush size” decides how wide a single stroke is (10 px up to a third of the image's short side), while “Mosaic block size” decides how large each block is (4–80 px, larger meaning blurrier). Strokes accumulate, and changing the block size re-renders every stroke already painted; “Clear all mosaic” wipes the slate. On export the mosaic is written into the pixels and cannot be reversed. Everything is processed in the browser.
This is a manual brush. To find faces and pixelate them automatically, or to work on a batch, use “Face blur”.
| Input | Output | Notes |
|---|---|---|
A phone number in a chat screenshot, 12 px blocks, 40 px brush |
A line of digits becomes unreadable blocks |
Once blocks are at least half the text height it is effectively unreadable |
Two faces in a group photo, 30 px blocks |
Two mosaic patches, the rest of the picture sharp |
Freehand painting means any shape |
Block size changed from 12 to 40 after painting |
All painted areas get coarser together |
Block size applies to every stroke |
Paint out the other person's nickname, phone number and transfer amounts.
Pixelate the address and the phone number.
Mosaic the faces of friends who would rather not be visible.
Cover keys, order numbers and other sensitive fields.
Once the blocks are large enough the original information is gone for good. A very fine mosaic (4–8 px) on a high-resolution image can still be guessed at, so use larger blocks.
The panel offers only “Clear all”; the top bar's undo (Ctrl+Z) steps back through recent actions.
Zoom in with the top bar or the + key, reduce the brush size, and follow the text.
Painting and pixelation run in the browser, so the screenshot is never uploaded to a server, and it is released from memory when the page is closed.
Updated 2026-09-09
Brush a mosaic over the parts of an image you want to hide
Everything runs locally in your browser; files are never uploaded to a server