PNG to WebP converter
Save PNG files as much smaller WebP images, with transparency kept. Pick a quality, convert many files at once and download them. Nothing is uploaded.
Updated
Drop files here or choose files
Your files stay on this device. Nothing is uploaded. You can also paste an image.
Your files are processed in your browser and never leave your device.
- Batch friendly
- Works on any device
- No account needed
How to convert PNG to WebP
- Add your PNG filesChoose PNG files, drop them on the box or paste an image. Each one is converted as soon as it is added.
- Pick a qualityThe default of 90 looks very close to the PNG. Lower the slider for a smaller file. Transparent areas stay transparent at every setting.
- Download the WebP filesSave each file, or press Download all (ZIP) to get a batch in one file.
What is a WebP image and why convert PNG to it?
WebP is an image format from Google that does the work of both PNG and JPG: it can be lossless or lossy, and it supports transparency. For web pages it is a common choice for smaller downloads, because the same picture often needs a fraction of the bytes of a PNG.
This converter writes lossy WebP. That is the main reason files shrink so much, and it means the picture is slightly changed, as with a JPG. The quality slider controls the trade. Use it when a site or app wants WebP, or when a PNG is too heavy to load or send.
Sources: Google for Developers: WebP Container Specification
How much smaller is the WebP?
We ran four PNG files through this converter and recorded the file the browser downloads. At the default quality of 90, the photo-like and illustration PNGs shrank to about 7 to 8 percent of their size. The flat logo shrank less, to 31 percent, because simple graphics already compress well as PNG. Your files will land somewhere else, depending on how much detail they hold.
| Image | PNG | WebP at 90 (default) | WebP at 75 | WebP at 60 |
|---|---|---|---|---|
| Photo-like, 4032 x 3024 px | 26,495,537 | 1,796,942 (7%) | 166,432 (0.6%) | 99,536 (0.4%) |
| Flat illustration, 1200 x 800 px | 530,320 | 43,226 (8%) | 21,608 (4%) | 18,626 (4%) |
| Photo cut to a circle, transparent corners | 313,980 | 23,964 (8%) | 13,672 (4%) | 12,144 (4%) |
| Flat logo with soft shadow, 1024 x 1024 px | 61,846 | 18,964 (31%) | 17,034 (28%) | 16,622 (27%) |
The photo-like image is our own sample scene scaled to 12 MP with seeded camera-like noise, which makes the PNG huge. Real photos differ. The other three are the sample scene, the same scene cut to a circle, and a rounded square with text and a soft shadow, all saved as PNG. Percentages are the WebP size as a share of the PNG. The 12 MP file took about one second to convert.
Transparency and quality
Transparent pixels stay transparent. We checked the output of both transparent test files and each one carries an alpha channel, so a circular cutout or a logo with a soft shadow keeps its edges. There is no background color to choose, unlike PNG to JPG.
Quality works like it does for JPG, but the numbers are not interchangeable: WebP at 90 is not the same picture as JPG at 90. Judge by eye. Lower quality can blur fine text and thin lines, so for screenshots and logos stay at 85 or above.
- There is no lossless WebP option here. Quality 100 is still lossy, so keep the PNG if you need exact pixels.
- WebP images can be at most 16,383 pixels on a side. Larger pictures are refused with a message.
- Animated PNG files give the first frame only.
- A JPG or other non-PNG file is rejected with a message pointing to the right converter.
When to keep the PNG
Keep PNG for files you will edit again, for pixel art, and for anything that must be exact to the pixel. Choose WebP for pictures that are only shown or sent: web pages, shop listings, chat and email.
If every browser and app you target is modern, WebP is safe. Very old software, some print services and certain upload forms still insist on PNG or JPG, and WebP to PNG goes back the other way.
Questions
How do I convert PNG to WebP?
Add your PNG files to the box on this page, choose a quality and download the WebP results. It takes a second or less for most files.
Does PNG to WebP keep transparency?
Yes. Transparent and semi-transparent pixels are carried into the WebP as an alpha channel, so cutouts and soft shadows stay as they were.
Is the WebP lossless?
No. This tool writes lossy WebP, which is why files get so small. Quality 100 is still lossy. Keep the original PNG if you need exact pixels.
How much smaller will my file be?
In our tests a 530 KB illustration became 43 KB at the default quality, and a 62 KB logo became 19 KB. Photos shrink the most, simple graphics the least. See the table above.
Why is my WebP bigger than the PNG?
Small images with few flat colors can already be tiny as PNG, and lossy WebP does not always beat them. If that happens, keep the PNG or lower the quality.
Will WebP work everywhere?
All current browsers display WebP. Some older apps, print services and upload forms do not accept it, and for those you can convert back to PNG or JPG.
Are my images uploaded?
No. The conversion runs in your browser and nothing is sent anywhere.