Convert
Convert JPG to WebP
Convert JPEG photos to WebP, the format that gives you the same visual quality in a noticeably smaller file. The single easiest win for a faster website.
Output
Why WebP is smaller
JPEG was finalised in 1992. WebP arrived in 2010 and benefits from eighteen years of additional research into how images compress. Where JPEG treats each 8 by 8 block largely on its own, WebP predicts each block from the pixels around it and stores only the difference — so a large area of sky, which is highly predictable, costs very little to encode.
In practice that means 25-35% smaller files at matched visual quality on typical photographs. The saving is largest on images with smooth regions — skies, studio backdrops, blurred backgrounds — and smallest on dense, busy, highly detailed scenes.
You are converting lossy to lossy
Your JPG has already been compressed once. Converting it to WebP decodes it and compresses it again, so a small amount of quality is lost in the round trip regardless of the setting you choose. This is unavoidable and usually invisible, but it is worth knowing two things.
First, convert from the highest-quality JPG you have rather than from a copy that has already been through several rounds. Second, do not set the WebP quality very low on top of an already-compressed source: you will be compressing compression artefacts, which wastes bits on noise that was never in the original photograph.
Serving WebP properly on a website
Every current browser supports WebP, so for most sites you can simply use the WebP file and stop thinking about it. If you need to support genuinely old browsers, serve both and let the browser choose:
<picture>
<source srcset="photo.webp" type="image/webp">
<img src="photo.jpg" alt="Describe the image here" width="1200" height="800">
</picture>Always set width and height on the img tag. Without them the browser does not know how much space to reserve, the page jumps as images load, and that jump is measured directly by Cumulative Layout Shift — one of the Core Web Vitals Google uses as a ranking signal.
Does converting to WebP help SEO?
Not directly. Google has no preference for one image format over another, and no ranking boost is applied for using WebP.
It helps indirectly, and the indirect route is real. Smaller images mean faster pages, page speed feeds into Core Web Vitals, and Core Web Vitals are part of how Google assesses page experience. On an image-heavy page, switching to WebP is usually the single largest speed improvement available for the least effort. Just do not expect the format itself to move anything.
How to convert JPG to WebP
- Drop your JPG files onto the box above. Whole folders work too.
- Choose a quality level. 80 is a good default for photographs.
- Review the size saving reported for each file.
- Download the WebP files individually or as a single ZIP.
Limits worth knowing
Every tool has boundaries. These are this one's, stated plainly so you do not waste time discovering them yourself.
- This is a lossy to lossy conversion, so a little quality is lost in the round trip. Convert from your highest quality original where possible.
- Some marketplaces and older desktop applications still reject WebP uploads. Keep your JPGs for those.
- WebP does not carry DPI metadata, so print resolution settings do not survive the conversion.