Image Mosaic
Add mosaic effect to images to protect privacy information
- Files never leave your device
- Runs in your browser
- Free, no sign-up, no watermark
Drop files here, or click to choose
Accepts JPG, PNG, WebP, AVIF, GIF, BMP, HEIC · You can also paste with Ctrl+V / ⌘V
How to use Image Mosaic
Hide faces, license plates or text by painting over them, or pixelate whole images at once. Choose square pixels, dots, hexagons, crystals or blur, set the cell size, and process a batch in your browser with separate marks on each image.
- 1
Drop your images on the page or paste them with Ctrl+V.
- 2
Under Apply to, choose Brush & shapes to mark areas, or Whole image to pixelate every image completely.
- 3
Pick a Style (Pixels, Dots, Hexagons, Crystals or Blur) and set Cell size with the slider or the 8, 16, 32 and 64 buttons.
- 4
Under Tools, choose Brush, Rectangle or Ellipse and paint or drag over the preview; use Eraser, Undo or Clear image to fix mistakes.
- 5
Click Apply and download, or Apply to N images for a batch. Images without marks are left out of the export.
Frequently asked questions
Are my images uploaded?
No. The mosaic is drawn on a canvas in your browser, and your images never leave your device.
Can someone undo the pixelation?
Small cells can sometimes be partly reversed, so keep cells large for faces and text. For passwords or account numbers, the solid fill in Blur Part of Image replaces the pixels completely.
How do I mark different areas on several images?
Click a thumbnail to switch images; each one keeps its own marks and undo history. Unmarked images are skipped on export unless Apply to is set to Whole image.
Are there keyboard shortcuts?
Yes: B brush, R rectangle, O ellipse, E eraser, [ and ] change the brush size, Ctrl+Z (⌘Z) undoes, Ctrl+Shift+Z redoes, and Esc cancels the stroke you are drawing.
Can I move a rectangle after drawing it?
No. Marks are fixed once drawn, so undo, erase or redraw them. For boxes you can move and resize, use Blur Part of Image.
Does the rest of the image lose quality?
Only the marked areas change. By default each image is saved in its original format; choose PNG under Output if you want no compression loss at all.