A PNG logo or interface graphic with a transparent background is the classic candidate for this: WebP keeps the alpha channel, and the file often comes out smaller. The catch is that this tool writes lossy WebP at quality 85 with no lossless mode. Edges and flat colours are not reproduced bit for bit, and some images, such as flat screenshots in our test, come out larger rather than smaller.
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Overview
About PNG to WebP
What happens to transparency
The alpha channel is kept, including partly transparent pixels such as soft edges and shadows. We checked this with a logo that has a soft-edged transparent surround: a fully transparent pixel stayed fully transparent in the WebP, and partly transparent values moved by at most one level out of 255, which we could not see. Unlike converting to JPG, nothing is flattened onto a background.
Lossy only: no lossless option
WebP has a lossless mode, but this tool does not offer it. Output is lossy WebP at quality 85. That is fine for most logos, photos and illustrations, but it is the wrong choice for pixel art, one-pixel UI lines, or any asset you will edit again and expect to be exact. Keep the PNG for those.
Size: three local examples
| Test image (generated for this test) | PNG | WebP at quality 85 |
|---|---|---|
| 600 × 600 logo with a soft transparent edge | 61.2 KB | 17.6 KB |
| 1200 × 800, gradients and noise | 2.22 MB | 286 KB |
| 1280 × 720 screenshot, flat colours with small hard-edged text | 11.9 KB | 27.4 KB |
The logo and the gradient image shrank. The flat screenshot grew to about 2.3 times its size. These figures come from images we generated and converted locally with this tool. They are examples only: not a benchmark, not a typical customer result and not a guaranteed ratio. They do show why you should compare the result before replacing a PNG.
Logos, screenshots and graphics
Logos and icons with transparency are usually good candidates, but zoom in on the edges. Screenshots with text are the case to test rather than assume. Large, photographic PNGs, such as a photo exported as PNG, gain the most.
When to retain the PNG
- It is your editable master or source file
- The destination accepts PNG but not WebP (some CMS fields, older software, print workflows)
- The WebP is not smaller than the PNG
For a broader comparison, including where WebP fits next to PNG and JPG, read the JPG vs PNG vs WebP guide. To shrink a PNG without changing its format, use the PNG compressor.
Compatibility
Supported Formats
Accepts PNG (.png), including PNGs with transparency. Output is a static WebP. Limits: 20 MB per file, 12,000 px per side and 40 megapixels.
Guide
How to Use PNG to WebP
- Choose a PNG file (up to 20 MB).
- Click "Convert PNG to WebP".
- Download the WebP and check its size against your PNG before you swap it into a page or project.
Highlights
Features
- Alpha channel kept Transparent and semi-transparent pixels carry over to the WebP instead of being flattened.
- Lossy WebP at quality 85 One fixed setting, no lossless mode. Pixels are not preserved bit for bit.
Applications
Use Cases
- Making a lighter version of a transparent logo or icon for a website
- Converting large photographic PNG exports to a smaller web format
- Testing whether WebP saves bytes on a specific screenshot or graphic before changing a site's assets
Good to Know
Limitations
Output is always lossy at quality 85. There is no lossless WebP option, no quality control and no animation. Some images, especially flat-colour screenshots, produce a larger file than the PNG. Text chunks, EXIF data and embedded colour profiles stored in the PNG are not copied, and no colour conversion is applied before the profile is dropped, so an image in a wide-gamut space such as Adobe RGB or Display P3 can look different afterwards.
Files are processed on our servers and are not shared with third parties. Files are deleted as soon as processing or download finishes. Any leftover temporary file is removed automatically by our cleanup process within the configured retention period (60 minutes). See our Privacy Policy for full details.
Support
Frequently Asked Questions
Does the WebP keep my PNG transparency?
Yes. The alpha channel carries over, including soft edges. In our test a fully transparent pixel stayed fully transparent and partly transparent values moved by at most one level out of 255.
Is any quality lost converting PNG to WebP?
Yes, because the output is lossy WebP at quality 85. Often it is hard to see, but flat colours, sharp text and fine lines are where it shows first. Keep the PNG as your master.
Why is my WebP larger than the PNG?
Flat-colour images with sharp text compress very well as PNG. In our local test, a generated 11.9 KB flat screenshot became a 27.4 KB WebP. If the WebP is bigger, keep the PNG.
Can I get lossless WebP from this tool?
No. This tool only writes lossy WebP at quality 85. If you need exact pixels, stay with PNG.
Will older browsers show the WebP?
Current Chrome, Edge, Firefox and Safari do. Very old browsers and some non-browser software may not. Keep the PNG available if you need a fallback.
Keep Going
Related Tools
- PNG to JPG Convert a PNG to JPG. Transparent areas are filled with white and quality is fixed at 85.
- JPG to WebP Convert a JPG to lossy WebP at quality 85, usually for a smaller copy to use on a website.
- WebP to PNG Convert a static WebP to PNG with transparency kept. The PNG is lossless but much larger.
- Image Compressor Compress a JPG, PNG or WebP without choosing a tool. It detects the format and applies that format's fixed setting.
- PNG Compressor Lossless PNG re-save that keeps every visible pixel and transparency. It helps with uncompressed PNGs and often will not shrink others.
- WebP Compressor Re-encode a static WebP as lossy WebP at fixed quality 75, keeping transparency. Lossless and already-small files can get larger.
- Image Resizer Resize a JPG, PNG or WebP to a width or height in pixels. The aspect ratio is locked unless you unlock it.
- SVG to PNG Convert an SVG vector graphic to a PNG image, with transparency preserved.
- Auto Trim Image Trim transparent or plain light borders around the content of an image. A dashed box shows exactly what will be kept before you save a PNG, WebP or JPG. In your browser.