Make photos smaller without sending them anywhere. Resize, re-encode, and see the exact saving before you download.
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JPG, PNG, WebP, GIF, BMP, TIFF
Some, by definition — that is what makes the file smaller. At the high setting the difference is invisible at normal viewing size, while low is meant for thumbnails and previews. The summary shows the exact saving so you can judge the trade for yourself.
WebP is usually 25-35% smaller than JPG at the same visual quality and is supported everywhere that matters. Keep PNG only when you need transparency or the image is a screenshot, diagram or logo — flat colour compresses badly as JPG.
No fixed cap. The image is processed in your browser, so the limit is your own memory. Very large panoramas may be slow on a phone.
No. The compression runs on your machine through the Canvas API. The file never leaves the browser, which is also why it works with no account and no waiting in a queue.