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client-side only

PNG to WebP

For pictures going onto a website. Smaller files, transparency intact, and the conversion runs in this tab so a client's artwork never leaves your machine.

· PNG, JPG, WebP, GIF, BMP

A whole folder at once is fine. Nothing is uploaded.

Files0
In0 B
Out0 B
Change–
No upload
    Quick answer

    WebP is for the web, and only the web

    // Answer

    Convert to WebP for images that will be served by a website. Every browser reads it and the files are smaller, often much smaller, with the transparency kept. Do not convert files you are going to email, hand to a print shop, or send to somebody who will open them on their desktop — that is where WebP can still fail.

    Where it works and where it stops

    The boundary

    DestinationWebPUse instead
    A web page you controlYes—
    An app or site that accepts uploadsCheck firstSome forms only take JPG or PNG.
    An email attachmentNoJPG
    A print shop or photo kioskNoJPG, or the original PNG
    Someone else's desktop softwareRiskyJPG

    The rule underneath all of that: WebP is a delivery format, not a storage format. Keep your PNG as the master.

    Measure, do not guess

    How much you will actually save

    Google's own studies report 26 percent smaller than PNG for lossless WebP and about 30 percent smaller than JPEG for lossy WebP. Those are averages over Google's test images, and your files can land a long way from them. A screenshot behaves completely differently from a portrait, and a PNG that should always have been a JPG will shrink by a margin no average would predict.

    The format benchmark encodes your own files at every quality setting and reports the real byte counts, including where the returns stop being worth it. It runs on your machine too, so you can measure a client's artwork without sending it anywhere.

    FAQ

    Frequently asked questions

    It depends entirely on the picture, which is why no single number answers it. Screenshots and flat graphics often shrink dramatically. Photographs saved as PNG shrink enormously, because PNG was the wrong format for them to begin with. The benchmark tool measures your own files rather than quoting an average.
    Yes. WebP supports an alpha channel, so a transparent PNG converts to a transparent WebP. This is the main advantage over converting to JPG, which has no transparency at all — our converter fills those areas with white.
    Yes, in practice. Chrome, Firefox, Edge, Safari and the mobile browsers have all supported WebP for years. Browsers are not where WebP runs out of road — software outside the browser sometimes is. Making a WebP is another matter: Safari cannot save WebP from a web page, so use Chrome, Edge or Firefox for this converter.
    You can, but the person receiving it may not be able to open it. Email clients, older desktop software, print shops and photo kiosks are where WebP can still fail, which is why JPG is the safer choice for anything going to a person.
    Yes. Keep the original as your master and treat the WebP as a derivative you can regenerate. If you ever need a different size or format later, you want to start from the PNG, not from something already compressed.

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