Technical support
Help for a precise, private workflow.
Rectangular Mosaic edits images locally in your browser and on your device. Find quick answers below for the most common editing and download questions.
The editor will not load
Use a current version of Safari, Chrome, Edge, or Firefox with JavaScript enabled. Refresh the page and try again. The editor needs the browser File API and Canvas API.
How do I mosaic part of an image?
Choose an image, drag over the exact area to protect, adjust the mosaic grain, and select Apply mosaic. You can undo the latest edit or choose another image at any time.
Which image formats work?
The browser editor accepts PNG, JPG, JPEG, WebP, and other formats that your browser can decode. The downloaded result is exported as a PNG file.
Where is my image uploaded?
It is not uploaded by the browser editor. Image processing happens locally in the current page. Refreshing or closing the page clears unsaved browser work.
The downloaded image looks different
Select a larger or smaller mosaic grain and check the selected rectangle before applying the effect. Always review the exported image before sharing it; you are responsible for confirming that sensitive details are adequately hidden.
Mobile app purchase or restore
Pro is a one-time purchase handled by the Apple App Store or Google Play. Use the same store account to restore a purchase. Store availability, payment, and refund decisions are handled by the relevant store.