Convert PNG to WebP
Keep transparency while getting a smaller file than PNG.
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How it works
Add your images
Drag and drop, paste, or pick files. They upload over an encrypted connection.
Pick a quality or a target size
Use the quality slider, or tell it exactly how many KB or MB you need.
Download
Save each file, or grab them all at once as a ZIP.
WebP supports transparency just like PNG does, but compresses it far more efficiently, so converting a PNG with a transparent background to WebP usually produces a noticeably smaller file with no visible change. This is one of the best conversions to make if your PNGs are mainly used on the web.
The one thing to check is where the image will be used: a small number of older tools and some image-editing software still expect PNG specifically. For any modern website, app, or current browser, WebP works as a direct, smaller replacement.
As with the rest of this site, your image is uploaded over an encrypted connection, never shared, and the result is deleted within one hour. Screenshots and UI mockups, in particular, tend to shrink dramatically when moved from PNG to WebP, often to a fraction of their original size with no visible difference. Text chunks and other data embedded in the PNG are left out of the WebP by default.
Two ways to turn a PNG into a WebP
This page starts in Quality mode at 80, which makes a lossy WebP. The colours are approximated the way a good JPEG approximates them, and the file is often a tenth of the PNG. For photos, cut-out product shots and illustrations with soft shading this is the conversion to use.
Switch the mode to Lossless and every pixel of the PNG is reproduced exactly. The saving is smaller, typically around a quarter compared with a well-packed PNG, but nothing at all changes in the picture. Choose it for pixel art, icons, diagrams and anything that will be edited again.
What happens to transparency and to coloured edges
In both modes the transparency layer is stored exactly, including soft shadows and anti-aliased outlines. A logo placed on a dark page looks the same as the PNG did, with no pale fringe.
The colours are a different matter in lossy mode. WebP stores colour at half the resolution of brightness, as JPEG and video do. On photographs you cannot see it. On small red or blue text against a contrasting background the edges can look slightly washed. If your PNG is an interface screenshot with fine coloured text, compare the result at full size, and move to Lossless if the text has lost its bite.
Limits of the format
WebP holds eight bits per colour channel. A 16-bit PNG, the kind a scanner or a raw converter can write, is reduced to eight bits during conversion, which is invisible on screen but matters if you plan heavy editing later. Keep the PNG as your master in that case. The largest WebP is 16,383 pixels on a side, so very long screenshots of whole web pages may need to be cut in two first.
Frequently asked questions
Does WebP keep my PNG's transparency?
Yes, fully, including partially transparent pixels.
How much smaller will the file be?
Often significantly smaller, though the exact amount depends on the image's content.
Will my image editor open a WebP file?
Most current design and editing tools do; a few older ones do not.
Can I convert back to PNG later if needed?
Yes, this site also has a WebP to PNG tool.
Will the WebP be smaller than a compressed PNG?
Almost always. Even after colour reduction a PNG cannot match lossy WebP on photographic content. On flat graphics with a handful of colours the two come out close.
Does converting change the size in pixels?
No. Width and height stay exactly as they were unless you also set a new size in the Resize panel.