Why convert JPG to WebP?
For websites and apps, WebP gives the same visual quality as JPEG in a noticeably smaller file, typically 25–35% smaller. Smaller images load faster, which matters for visitors on mobile data and for search rankings that weigh page speed.
Quality
Your JPG is already compressed. Converting at quality 75–85 usually gives a smaller file that looks the same; going lower saves more but starts to soften detail. The live preview shows the result and the saving before you commit.
Where WebP works
Every current browser, Windows 11, macOS, iOS and Android display WebP, and most website builders accept it. Many government upload forms and some older software do not, so keep JPGs for those.
Also consider AVIF
AVIF is smaller again, at the cost of slower encoding and slightly less support. Choose it in the compressor to compare.
JPG and WebP compared
| Feature | JPG | WebP |
|---|---|---|
| Size for the same look | Larger | 25–35% smaller |
| Transparency | No | Yes |
| Browser support | Universal | All current browsers |
| Upload-form support | Universal | Patchy |
Step by step
- Add your JPG files: choose them, drag them onto the page, or paste.
- Set the quality; 85 is a good default.
- Click Convert to WebP.
- Download each file, or all of them as a ZIP. File names stay the same with the new extension.
Without this tool
Built-in Windows and macOS apps do not export WebP; you would need an image editor. Website platforms such as WordPress can convert on upload with plugins, but converting first keeps you in control of the quality.
Troubleshooting
- A file shows an error. It may not really be JPG: files are sometimes renamed without being converted. The tool reads the file's contents, not its name, and says what it found.
- The converted file is larger. That is expected when going to a less efficient or lossless format; it is not a fault.
- Colours shift slightly. Wide-gamut originals are converted to standard sRGB, which every screen shows consistently.
Checking the result
Before replacing images on a live site, compare a few at 100% zoom: faces, text in photos and fine textures show compression first. The live preview here shows the WebP result and its size for the selected image as you move the quality slider, so you can settle on a setting before converting a whole batch.
Batches for websites
Convert a whole folder of product or blog images at once and download a ZIP with the same file names and a .webp extension, ready to upload. The batch licence raises the limit to 500 images and adds folder drop.
Private by design
The image never leaves your device. It is decoded in your browser, processed in a background worker by open-source codecs compiled to WebAssembly (MozJPEG, libwebp, libavif and OxiPNG, via the jsquash project, plus pica for resizing) and handed back as a download. There is no upload, no account and no server copy to delete. You can confirm it in your browser's developer tools: the Network tab shows the page's own files and the codec files loading, and nothing carrying your image. After the first visit the tools work offline.