SajinbaroResize & compress images
한국어

Pixelate or black out parts of an image

Choose an image, drag over the parts to hide on the preview (as many as you need), then press “Apply mosaic”. For faces, licence plates or ID numbers, “Black out” is recommended.

Or drop it here. One JPEG, PNG or WebP image · up to 20 MB · 20 megapixels · 8,192 px on the long side. Your image never leaves this device.

Result

Choose an image to compare the original and the result here.

How it works

  • Pixelation splits each selected area into square blocks and paints each block in its average colour. The strength is the block size in pixels of the original image (8, 16, 32 or 64 px), so a small preview does not change the strength of the saved file.
  • Black out fills the area with opaque black, so none of the original pixels remain.
  • The result is saved as one flat image. The original photo, the selected areas and the edit history are not stored in the file.
  • Up to 20 areas can be added and removed one by one from the list. You can also add them by numbers (X, Y, width, height).

Can a pixelated area still be recognised?

It can. With small blocks or large text, the content may still be guessed, and there are techniques that try to reverse pixelation. Use “Black out” for anything that must not be revealed, such as faces, licence plates, ID numbers or addresses — no original pixels remain there.

  • Even strong pixelation (32 or 64 px) does not guarantee anonymisation.
  • Open the result file yourself before sharing to check that everything is hidden.

Is my image uploaded to a server?

No. The image is opened and saved again only inside this browser. It is never sent to a server, and the work pages carry no ads or third-party analytics. When you close the page, the image and the result are cleared from memory.

Is camera information such as location (EXIF) removed?

The image is redrawn and saved through the browser's canvas, so the original camera information is usually not carried into the result. This has not been confirmed for every browser and file, so removal is not guaranteed. If the photo contains sensitive information, check the result with another tool.

Sources and rules

  • Canvas toBlob (MDN): How the browser saves an image in a chosen format and quality. If a format is not supported, the real output format is checked and you are told.
  • createImageBitmap (MDN): How the image is opened. Rotation information (EXIF orientation) is applied where the browser supports it.