PNG to WEBP
PNG to WebP conversion, with the quality and size consequences stated up front.
Why convert PNG to WEBP
WebP in lossless mode is typically around a quarter smaller than PNG with pixel-identical output, and it keeps the alpha channel that PNG has.
What you give up
Older desktop editors cannot open WebP, so a file destined for someone else's design application may become unusable to them.
When it is the right move
This is the best conversion for icons, logos and interface graphics going onto a website: smaller than PNG, identical pixels, transparency preserved.
Size, honestly
Lossless WebP is commonly 20–30 percent smaller than the equivalent PNG; lossy WebP can be far smaller still, at the cost of exactness.
Why this runs in your browser
The file is read from your disk by the browser, decoded with the browser's own codecs, and re-encoded in this tab. No upload request is made, nothing is queued on a server, and closing the tab leaves no copy anywhere. You can verify this in the network panel while it works.
How to use it
- Drop one or more PNG files on the drop zone.
- Set the output format to WEBP.
- Convert and check the reported before-and-after file sizes.
- Open the result and check transparency and edge detail before shipping it.
Worth knowing
- Output format is WEBP and input is read as PNG.
- Size expectation for this direction: Lossless WebP is commonly 20–30 percent smaller than the equivalent PNG; lossy WebP can be far smaller still, at the cost of exactness.
- Conversion happens in the browser; no file leaves your machine.
- Metadata is discarded by the canvas round-trip.
Limitations
- Older desktop editors cannot open WebP, so a file destined for someone else's design application may become unusable to them.
- Animation is not preserved when converting from an animated source.
- Converting between two lossy formats compounds compression artefacts.
- Writing WEBP depends on your browser exposing that encoder.