What is WebPConverter?
WebPConverter is a free online tool that converts PNG and JPG images to the WebP format. It works as a bulk image compressor: add one image or hundreds, pick a quality level, see exactly how much space you save and download the results one by one or all together as a ZIP. Everything runs locally in your browser with the HTML5 Canvas API, so there are no uploads, no sign-up and no watermarks.
Key features
- PNG and JPG to WebPConvert both formats, with PNG transparency preserved.
- Bulk conversionDrop many files at once and convert them as a batch.
- Quality sliderChoose 10% to 100% and see results update instantly.
- Size comparisonSee original size, WebP size and percent saved per image.
- Download AllGet every converted file in a single ZIP, or download one by one.
- Private by designYour images never leave your device. No account needed.
How to convert PNG or JPG to WebP
- Drag and drop your PNG or JPG images into WebPConverter, or click Choose Files.
- Adjust the quality slider. 80% works well for most photos and graphics.
- Check the size and percent saved for each image.
- Click Download on a single image, or Download All (ZIP) for the whole batch.
WebP vs PNG vs JPG
| Feature | WebP | PNG | JPG |
|---|---|---|---|
| Typical file size | Smallest | Largest | Small |
| Transparency | Yes | Yes | No |
| Compression | Lossy or lossless | Lossless | Lossy |
| Best for | Websites and apps | Graphics, screenshots | Photos |
| Browser support | All modern browsers | Universal | Universal |
Frequently asked questions
Is WebPConverter really free?
Yes. WebPConverter is completely free. There is no sign-up, no watermark and no limit on how many images you convert.
Are my images uploaded to a server?
No. WebPConverter converts images 100% inside your browser using the HTML5 Canvas API. Your files never leave your device, so they stay private.
How do I convert PNG to WebP?
Drag your PNG files into WebPConverter or click Choose Files, set the quality slider (80% is a good default), then download each WebP file or click Download All. PNG transparency is preserved.
How do I convert JPG to WebP?
Add your JPG or JPEG files to WebPConverter, choose a quality level and download the converted WebP images. WebP is usually noticeably smaller than JPG at similar visual quality.
Does converting to WebP reduce image quality?
WebPConverter uses lossy WebP encoding, so quality depends on the slider. At 80% to 90% the difference is usually hard to see while file sizes drop significantly. Use 100% for the highest fidelity. Always keep your originals.
Can I convert many images at once?
Yes. Drop as many PNG or JPG files as you like. WebPConverter converts them as a batch, shows how much space each one saves, and Download All packs the results into a single ZIP file.
Which browsers support WebP?
All modern browsers can display WebP images, including Chrome, Edge, Firefox, Safari and Opera. Creating WebP files in the browser works best in Chrome, Edge, Firefox and Opera. If your browser cannot encode WebP, WebPConverter will tell you.