Convert an image to WebP

Why WebP

WebP is a web image format that reaches a smaller file at the same apparent quality than JPEG, mostly by predicting blocks of the image from their neighbours rather than storing every block from scratch. A smaller file is a faster page, and page speed is one of the few image decisions a search engine measures directly.

Google puts the saving at 25 to 34% against JPEG. We measured our own photographs and got 14 to 20%, which is a real saving and not the advertised one. The full comparison against JPEG, PNG and AVIF has the numbers and the files they came from.

When to use something else

• AVIF was 57 to 58% smaller than JPEG on the same images, roughly three times the saving WebP gave. It is in the format list above when your browser can encode it. Support is good enough in 2026 that it is worth trying first.
• PNG for anything with hard edges and flat colour: logos, screenshots of text, diagrams. WebP can do these losslessly too, but a PNG is the safer file to hand to someone else.
• JPEG when the file is going somewhere old or unknown. Every piece of software made in the last thirty years reads a JPEG.

Is this really free

Yes, and it stays free. The conversion is done by your own browser, not by a server we pay for, so there is no cost to us per image and nothing to meter. No account, no watermark, no queue, no daily cap.

What we do charge for is the other half of the job. Resiqo reads a whole folder of photographs, writes each one a descriptive filename and its alt text, then resizes and converts the lot and hands it back as a single zip. That part uses a model, which costs money to run.