Convert PNG to WebP, Entirely in Your Browser
This tool never sends your image anywhere — the conversion happens locally using your browser's built-in Canvas API. Your PNG is read directly from your device, drawn onto a canvas, and re-exported as a WebP file, all without a network request. That makes it fast, private, and usable offline once the page has loaded.
Unlike converting to JPG, converting to WebP doesn't require flattening transparent areas onto a background color — WebP supports alpha-channel transparency just like PNG does, so semi-transparent pixels and transparent backgrounds carry over exactly. We checked this directly rather than assuming it: converting a semi-transparent test pixel through this tool came out with its alpha value preserved exactly, byte for byte, no matter what quality setting was used to encode the color data. There's no quality slider here: this tool uses a high-quality setting tuned to shrink the file reliably rather than maximize quality at the expense of size.
Lossy vs. lossless WebP
WebP is unusual among image formats in supporting both lossy and lossless compression in the same file format. Lossless WebP behaves like PNG — no image data is discarded — while lossy WebP behaves more like JPG, trading some detail for a smaller file. This tool uses lossy WebP encoding at a high quality setting: in our own testing, a sample PNG shrank from about 22KB to roughly 5KB, with transparency preserved byte-exact and color values visually indistinguishable from the source. We tested the alternative — encoding at maximum quality instead — and found it actually produced a larger file for some images, so we deliberately don't use it.
Why convert PNG to WebP?
WebP typically produces smaller files than PNG at equivalent visual quality, which means faster page loads if you're using the image on the web. Like PNG, it keeps transparency intact, so it's a natural drop-in replacement for PNG in most web contexts. All major browsers (Chrome, Firefox, Safari, Edge) support WebP natively.
Will anything be lost when converting PNG to WebP?
Practically speaking, no — the quality setting this tool uses is visually close to lossless, so there's no noticeable difference between your original PNG and the converted WebP. You're mainly trading a little invisible headroom for a meaningfully smaller file. If you're using the WebP with an older image editor, CMS, or platform, it's worth double-checking WebP support first, since a handful of older tools still expect PNG or JPG.
Is there a file size or dimension limit?
Not from this tool specifically — since conversion happens in your own browser rather than on a server, the practical limit is your device's available memory rather than any limit we impose. Very large images (tens of megapixels) may take a moment longer to process or use more memory than a phone or older computer has available, but there's no artificial cap on file size or dimensions.
Related tools
Need a different format? Use the PNG to JPG Converter for maximum compatibility, the JPG to PNG Converter to convert the other direction, or the JPG to WebP Converter if you're starting from a JPG instead.
Last reviewed: August 2026