Choose a picture and Photopip runs Mosaic on it: the picture is shrunk smoothly to one pixel per cell and scaled back up with hard edges, so each cell becomes one flat color taken from that area, and the picture keeps its size. The cell starts at about 1/80 of the long side, 23 px on the 1,800 px sample. Change it on the card and download. To hide one area only, click Boxes on the card and drag a box over it.

1. Click Choose an image, or drop a PNG, JPG or WebP on the page. The picture turns into blocks at once, and History shows Mosaic.
2. On the card, type a Cell size from 2 to 200 and press Enter; bigger cells give coarser blocks. While Mosaic is still the last step in History, it is undone first, so History keeps one step.
3. Click Download JPG (a PNG stays PNG). The file keeps its pixel size.
4. One area only: click Boxes on the card. The whole-picture mosaic is undone and the Rectangular Marquee Tool is selected; drag a box over each area, and it pixelates when you let go. Each box is one Mosaic step in History.

Mosaic turns each cell into one flat color drawn from that area, so large text or a face under small cells can still be guessed: use a cell at least as tall as the text, or paint a solid rectangle over it. Boxes are rectangles; for another shape, select it in the editor and choose Filter > Pixelate > Mosaic.... One image at a time; a JPG is re-encoded once at quality 92. Animated GIFs use their first frame.

Can I pixelate just one part?

Yes. Click Boxes on the card and drag a box over each part. If you change Cell size afterwards, the boxes are redone at the new size.

What cell size should I use?

On a photo about 1,200 px wide, 8 to 12 reads as an effect. To hide text, make the cell at least as tall as the letters.

Does it shrink the picture?

No. The blocks are cells inside the same file, which keeps its width and height.

Can I undo it?

While the picture is open, press Ctrl+Z (Command+Z on a Mac). The downloaded file has only the blocks, so keep your original.

Updated 2026-10-27

More toolsRemove my watermarkRemove EXIF dataView image metadataBlur facesBlur a license plateRemove backgroundRemove textPDF to JPG

Choose a picture and Photopip runs Mosaic on it: the picture is shrunk smoothly to one pixel per cell and scaled back up with hard edges, so each cell becomes one flat color taken from that area, and the picture keeps its size. The cell starts at about 1/80 of the long side, 23 px on the 1,800 px sample. Change it on the card and download. To hide one area only, click Boxes on the card and drag a box over it.

1. Click Choose an image, or drop a PNG, JPG or WebP on the page. The picture turns into blocks at once, and History shows Mosaic.
2. On the card, type a Cell size from 2 to 200 and press Enter; bigger cells give coarser blocks. While Mosaic is still the last step in History, it is undone first, so History keeps one step.
3. Click Download JPG (a PNG stays PNG). The file keeps its pixel size.
4. One area only: click Boxes on the card. The whole-picture mosaic is undone and the Rectangular Marquee Tool is selected; drag a box over each area, and it pixelates when you let go. Each box is one Mosaic step in History.

Mosaic turns each cell into one flat color drawn from that area, so large text or a face under small cells can still be guessed: use a cell at least as tall as the text, or paint a solid rectangle over it. Boxes are rectangles; for another shape, select it in the editor and choose Filter > Pixelate > Mosaic.... One image at a time; a JPG is re-encoded once at quality 92. Animated GIFs use their first frame.

Can I pixelate just one part?

Yes. Click Boxes on the card and drag a box over each part. If you change Cell size afterwards, the boxes are redone at the new size.

What cell size should I use?

On a photo about 1,200 px wide, 8 to 12 reads as an effect. To hide text, make the cell at least as tall as the letters.

Does it shrink the picture?

No. The blocks are cells inside the same file, which keeps its width and height.

Can I undo it?

While the picture is open, press Ctrl+Z (Command+Z on a Mac). The downloaded file has only the blocks, so keep your original.

Updated 2026-10-27

More toolsRemove my watermarkRemove EXIF dataView image metadataBlur facesBlur a license plateRemove backgroundRemove textPDF to JPG