Convert the images on a page to WebP without leaving it

WebP, JPEG and PNG, or Auto, which picks per image. Quality runs from 50 to 100 in steps of 5 and starts at 80. PNG is lossless, so the slider greys out when you pick it.

If you want it to. Leave images at their original size, or fit them to the size they're actually displayed at, or to twice that so they still hold up on a retina screen. That last one is the default, because it's the setting that shrinks a page most without anyone noticing. None of them scale an image up past its natural size, so a small source stays small.

The original and optimized totals sit side by side while the batch runs, so you can see what the page would weigh either way. Optimized images are swapped into the page as they finish, which means you're looking at the compressed version at the quality you picked rather than guessing from a number.

Save optimized collects everything the batch re-encoded into a single ZIP and downloads it, so you can drop the results straight into your own build. The button stays greyed out until at least one image has been through.

They stay visible in the count. An image served from another domain without CORS headers is off limits to the canvas, so it can't be re-encoded. Those go under a Skipped chip in the toolbar, and clicking it filters the list down to them. Change a setting and press Re-run to send the batch through again.

No. The swap happens in your browser, on your copy of the page, and it's gone on reload. Nothing is uploaded and nothing is written back to the server, so you can try WebP on a client's production site and see the result before anyone commits to shipping it.

Assets is for getting files off a page: it lists every image, SVG, video, PDF and Lottie file and lets you download them. This is for making the ones already there smaller. The Assets panel has its own page if pulling files is what you're after.

Yes. Every tool runs in the Firefox build, and the same license covers it. Chrome, Edge, Brave and other Chromium browsers are supported too.

It's one of Hoverify's tools rather than a standalone product. Hoverify is paid with a 14-day refund behind it, so run it over a few real pages and decide from that. The refund is what stands in for a trial. One license runs in 3 browsers at a time, and nothing auto-renews. See the pricing.