Free Online Tool
Image Mosaic Tool
Manually select a rectangular area in a JPG, PNG, or WebP image and apply a mosaic effect before downloading it.
Drag a rectangle over the preview. Touch dragging is supported on mobile browsers where available.
Preview
Processing Result
The result will appear here.
Selected images are not uploaded to a server and are processed only in your browser.
How to Use
- Select an image file.
- Drag over the preview with a mouse or touch to choose the mosaic area.
- Choose the mosaic block size and apply it.
- Repeat on other areas if needed, then download the image.
Examples
- Pixelate part of a face in a photo
- Hide personal information in a screenshot
Calculation and Conversion Notes
Image mosaic processing is done by scaling the selected area down on a browser canvas and then scaling it back up to create a pixelated block effect. Selected images are not uploaded to a server and are processed only in your browser.
FAQ
Is my image uploaded to a server?
No. The selected image is processed only in your browser.
Can I hide only part of a face or personal information?
Yes. Only the rectangle you select is pixelated.
Can I apply mosaic to multiple areas?
Yes. Apply one area, then select another area and apply again.
Can I adjust the mosaic strength?
Yes. Change the block size to make the mosaic finer or stronger.
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