What are your images costing you?

Enter your address. We read the page, take the largest photographs, and re-encode them to AVIF — then show you both versions side by side and hand you the files.

How this works

Your page is fetched through our server, because a browser isn't allowed to read another site's bytes directly. That's the only part that happens on our side. The conversion itself runs on your machine, in a Web Worker, on the same WebAssembly build the converter uses — you can watch the Network tab stay quiet while it works.

Quality isn't a number we picked. Each image is encoded to the smallest size that still clears a PSNR and SSIM target measured against your original, so the floor is a measurement rather than an opinion. Nothing is resized — same dimensions, fewer bytes.

Images already served as WebP or AVIF are shown but excluded from the totals: comparing our output against a file your visitors never receive would flatter the number.