JPG to WebP
Convert JPG images to WebP for smaller file sizes and faster web loading.
How it works
Upload JPG
Select your JPG/JPEG image file.
Convert
We convert it to WebP format at high quality.
Download
Download your WebP image.
About This Tool
WebP is Google's modern image format built to deliver smaller files than JPEG without a visible drop in quality. Switching your website's JPG images to WebP can cut page weight by 25–35%, directly improving load times and Core Web Vitals scores — both of which influence search rankings. All major browsers now support WebP, making it safe to deploy without fallbacks in most projects.
JustConvert converts your JPG to WebP using a high-quality encoding pipeline. The result is a smaller, web-optimised image that looks identical to the source at normal viewing distances. No account is needed and all files are purged after download.
- check_circle25–35% smaller than equivalent JPEG
- check_circleNo visible quality difference at standard sizes
- check_circleSupported by all modern browsers
- check_circleIdeal for boosting Core Web Vitals
- check_circleRetains EXIF metadata on request
- check_circlePrivacy-first: files deleted after download
The size saving, and where it comes from
Converting JPG to WebP typically reduces file size by 25 to 35 percent at visually equivalent quality. The gain comes from a more modern compression design: WebP uses prediction techniques borrowed from video encoding, where each block of the image is predicted from its neighbours and only the difference is stored. JPG, designed in 1992, has no equivalent.
On a page carrying a dozen photographs, that difference is usually the single largest available improvement to load time, and it is invisible to the viewer. For sites measured on Core Web Vitals, image weight is very often what determines the Largest Contentful Paint score, which makes this conversion one of the highest-value changes available for the effort involved.
Converting an already-lossy file
A JPG has already discarded data. Converting it to WebP decodes that result and re-encodes it, which is a second lossy pass, so some further degradation is unavoidable in principle. In practice it is not visible at reasonable quality settings, because the encoder is working from an image whose noise and fine detail have already been smoothed by the first pass.
Two rules keep it clean. Convert from the highest-quality JPG you have, not from a version already compressed for the web, since each round of lossy encoding compounds. And do not convert back and forth: if a WebP later needs to be a JPG for a portal, convert once from the original JPG rather than from the WebP you made from it.
Serving both formats
For a website, the robust pattern is to offer WebP with a JPG fallback rather than replacing the JPG outright. The HTML picture element does this natively: list the WebP in a source and the JPG in the img, and each browser takes the first format it understands. Browser support for WebP is effectively universal now, so this is belt-and-braces rather than strictly necessary, but it costs nothing and covers unusual clients, feed readers, and scrapers.
Keep the original JPGs regardless. They are what you will need when someone asks for an image to print, to attach to an email, or to upload to a system that rejects WebP — and regenerating a JPG from a WebP is a third lossy pass. Treat WebP as the delivery format and JPG as the source.
JPG against WebP
| JPG | WebP | |
|---|---|---|
| Typical file size | Baseline | 25 to 35% smaller |
| Transparency | Not supported | Supported |
| Browser support | Universal | Universal in current browsers |
| Upload portals and print | Accepted | Frequently rejected |
| Best role | Source and distribution copy | Delivery format on websites |
Frequently Asked Questions
Is WebP better than JPG for websites? expand_more
For web use, yes. WebP achieves comparable visual quality to JPEG at roughly 25–35% smaller file sizes, which means faster page loads and lower bandwidth costs. All Chromium-based browsers, Firefox, and Safari support WebP natively.
Can I use WebP images on all devices? expand_more
WebP is supported on all modern browsers including Chrome, Edge, Firefox, and Safari 14+. Older iOS and macOS users on Safari 13 or below cannot display WebP, but they represent a tiny fraction of traffic today.
Does converting JPG to WebP lose quality? expand_more
JustConvert uses a high-quality encoding setting that keeps the output visually indistinguishable from the source JPEG. There is a theoretical re-encoding step, but at the quality levels we use the difference is imperceptible.
Can I convert multiple JPGs at once? expand_more
Batch conversion is available — select multiple JPG files at once and the tool will return a ZIP archive containing all converted WebP images.
Do I need to install anything to use this tool? expand_more
No installation is required. The conversion runs entirely on our servers and works from any modern browser on a phone, tablet, or desktop.