Convert PNG to WebP — Free, No Signup
Convert PNG to WebP and keep the alpha channel. This is the conversion to reach for when a PNG is too heavy but the transparent background has to survive — something JPEG cannot offer at any quality setting.
How to do it
- Drop your PNG onto the upload box.
- Choose WebP as the output format.
- Pick a quality level. WebP keeps transparency, so nothing is flattened.
- Download the WebP — typically 25–35% smaller than the PNG.
Transparency survives, size does not
WebP is the only widely supported format that gives you both a real alpha channel and modern compression. Converting a transparent PNG to WebP typically cuts the file by 25 to 35 percent losslessly, and much further if you accept a lossy encode. The transparent background comes through exactly as it was, including soft anti-aliased edges on logos and icons. This is the reason to prefer WebP over JPEG for any graphic that has to sit on a coloured background — JPEG would flatten it onto white and ruin it.
Browser support is no longer a concern
Every current browser has read WebP for years, including Safari, so using it on the web is uncontroversial. The remaining gaps are outside the browser: some older desktop software, a few print services, and various upload forms that were written against a fixed list of extensions. If a WebP gets rejected somewhere, that is almost always the reason, and converting to JPG or PNG solves it. For anything that will be displayed in a browser, WebP is the sensible default.
How much you actually save
The saving depends heavily on content. Flat graphics, icons, and interface screenshots — the things PNG already handles reasonably — improve by around a quarter to a third. Photographic content inside a PNG improves enormously, because PNG was the wrong container for it in the first place. Images with large transparent regions do well, since WebP encodes runs of fully transparent pixels efficiently. A design export with a photo, a gradient, and a transparent margin often halves.
Quality settings and what they mean here
The converter encodes WebP at the quality you choose, defaulting to 90. Because your source is a lossless PNG, there is no accumulated loss to compound, so 90 is genuinely conservative and the result will be hard to distinguish from the original. Drop to 80 for web assets where size matters more than pixel-exactness. Keep 90 or above for anything with fine text or hard-edged line art, where lossy encoding shows first.
Practical notes
Pixel dimensions are unchanged; only the encoding differs. Input is capped at 5 MB. The alpha channel is preserved rather than composited, which is the whole point of this particular conversion. Everything runs on your own device in the browser, so nothing is uploaded and there is no queue.
Frequently asked questions
Does WebP keep transparency?
Yes. WebP has a full alpha channel, and transparent areas convert across unchanged, including soft anti-aliased edges.
How much smaller is WebP than PNG?
Usually 25 to 35 percent for flat graphics and icons, and far more for photographic content that was stored as PNG.
Do all browsers support WebP?
Yes, every current browser including Safari. Gaps are outside the browser — some older desktop software and upload forms still refuse it.
What quality should I use?
90 is the default and is visually lossless from a PNG source. 80 is fine for web assets. Stay at 90 or above for fine text and line art.
My upload form rejected the WebP. What now?
Convert to PNG or JPG instead. Form rejections are almost always an extension whitelist rather than anything wrong with the file.