Image pixelation (also called mosaic or censoring) is a technique that averages pixel colors within a block to create a low‑resolution effect. It’s commonly used to hide faces, license plates, or confidential text while keeping the surrounding image intact. Our tool lets you manually select the area and adjust the block size for precise control.

Upload your image, then click and drag directly on the picture to draw a rectangular selection over the area you want to censor. Move the selection by dragging inside it. Adjust the “Block Size” slider to make the mosaic coarser or finer. The pixelation is applied in real time — no extra steps needed.

No. Everything happens right in your browser using HTML5 Canvas and JavaScript. Your image is never sent to any server, ensuring complete privacy. You can safely edit sensitive documents without worrying about data leaks.

Yes. Use the Block Size slider (2 – 50 px). Lower values produce a subtle mosaic, while higher values give a classic heavy censor look. The effect updates instantly on your selection.

You can upload JPG, PNG, WebP, and most common formats. The edited result is always downloaded as a PNG file to preserve transparency and quality.

Absolutely. The tool is fully responsive and supports touch gestures. You can draw, move, and adjust selections on smartphones and tablets just like on a desktop.

Use the Clear Selection button to delete only the current rectangle, or Reset to wipe all pixelation and restore the original image. You can then draw a new selection.

There are no artificial limits, but extremely large images (e.g., 50 MP) may slow down rendering on older devices. We recommend photos under 5000 px on the longest side for smooth performance.