Free Image to WebP Converter
The quickest win for a slow website
If your site feels slow and you have not looked at your images, start there. Pictures are usually the heaviest part of a page, and WebP is a format designed to make them lighter. At similar visual quality, WebP files are commonly around a quarter to a third smaller than JPG, and they can also hold transparency like PNG. This converter turns JPG, PNG, GIF and BMP images into WebP in your browser, shows how much each one shrank, and lets you download them as a ZIP.
How to convert, and what quality to pick
- Drop your images on the box or choose them.
- Leave the quality at 85 percent for a good balance, or try 75 to 80 percent for smaller files on photographs.
- Check the saving shown beside every image.
- Download them one by one or all together.
Transparent areas of a PNG stay transparent in the WebP.
Browser support in practice
Every current major browser, including Chrome, Edge, Firefox and Safari, displays WebP. The only people who may not see it are on very old browsers, which is a tiny share of visitors for most sites. Email apps and some older software are a different story, which is why WebP is a format for websites and not for attachments or upload forms.
Using WebP on a WordPress site
- Recent versions of WordPress accept WebP uploads in the media library, so you can convert first and upload the result directly.
- WordPress still makes its own smaller copies for different screen sizes, so a sensible starting size matters. Resize to the width you display first, using the image resizer.
- Keep the JPG or PNG originals somewhere safe, in case you need to edit or print them later.
- Name files clearly, such as
red-ceramic-mug.webp, and add alt text when you upload.
When not to use WebP
WebP is designed for screens. For email attachments, Word documents, printing and upload forms, JPG or PNG are safer, because some apps and older systems still do not open WebP files. If you receive a WebP you cannot open, convert it back with the WebP to JPG converter. And remember that converting a JPG to WebP is a second round of lossy compression, so for the best result convert from your original, not from a copy that was already heavily compressed.
Rolling it out on an existing site safely
- Pick one page and convert its largest images first.
- Upload the WebP files and replace the old ones on that page.
- Check the page in the browsers and devices you care about.
- Compare the page weight before and after with your browser’s developer tools.
- Only then work through the rest of the site, starting with the most visited pages.
Doing it in steps means that if anything goes wrong, you know where, and it is easy to undo. Keep a backup of the original images before you replace anything.
Common mistakes when switching to WebP
- Converting an already heavily compressed JPG. Starting from a poor copy gives a poor result. Use the original.
- Deleting the originals. You will want them for editing and printing.
- Putting WebP into emails and newsletters, where support is patchy.
- Forgetting alt text and descriptive file names, which matter just as much for WebP as for any format.
- Skipping the resize. A smaller format cannot make up for a picture that is far larger than the space it fills.
Measure the difference
Do not take our word for the saving. Convert five of your own images and compare the numbers shown beside each one. Photographs often shrink a lot. Simple graphics can shrink less, and tiny images sometimes barely change. Then check the page speed of one real page before and after, with a tool such as PageSpeed Insights, to see what the change did for you.
FAQ
It depends on the image, but WebP is often around a quarter to a third smaller than JPG at a similar visual quality.
Yes. Transparent areas in PNG images stay transparent when converted to WebP.
All current versions of the major browsers do. Very old browsers may not.
This tool uses lossy WebP with a quality setting, which gives much smaller files. At 85 percent the difference from the original is very hard to see.
No. The conversion happens in your browser.
Yes, with the WebP to JPG converter, which is useful when a form or program does not accept WebP.
Both. It handles photographs well with lossy compression, and graphics with flat colours and transparency work well too.
The tool shows the saving next to each converted image, so you can see exactly how much smaller every file became.
The tool shows the saving next to each converted image, so you can see exactly how much smaller every file became.