Convert JPG to WEBP for Smaller Files

How much you actually save

Google's own measurements put lossy WEBP at 25-34% smaller than JPEG for the same SSIM quality, and independent tests on real photo sets land in the same range. On a product page with twenty images that is the difference between a 4 MB page and a 2.8 MB page — enough to move a Lighthouse score by several points and to noticeably change how the page feels on a phone on mobile data.

The saving is largest on photographs with smooth gradients and smallest on already heavily compressed JPEGs, where much of the detail has been discarded and there is less left to compress.

Browser and tool support in 2026

• Chrome, Edge, Firefox, Safari 14+, Opera and Samsung Internet: full support, including on iOS.
• WordPress: native WEBP upload support since 5.8.
• Shopify, Squarespace and Wix: convert to WEBP automatically on their own CDN — you do not need to.
• Email clients: patchy. Use JPG in email, not WEBP.
• Print shops and marketplace listing forms: usually reject WEBP. Keep a JPG master.

Serve it correctly

Converting the file is only half the job. Serve WEBP with a fallback so nothing breaks for a visitor on an old device, using a picture element with the WEBP as the first source and the JPG as the img fallback. Keep the same width and height attributes on the img tag so the browser reserves the space and the page does not shift while images load.

Privacy

Nothing is uploaded. The file is decoded and re-encoded by your own browser using the Canvas API, so the image never leaves your device and there is no queue, no size cap and no account.