Convert PNG to WebP
Convert PNG to WebP right in your browser — free, private, nothing is uploaded. Smaller files at the same quality, transparency included.
Convert PNG to WebP →Free · Private — runs in your browser, nothing is uploaded
PNG is the standard lossless web image: screenshots, UI graphics, logos and anything with sharp edges or transparency come out pixel-perfect.
WebP is the modern web format: at similar visual quality it produces noticeably smaller files than both JPEG and PNG, and it supports alpha transparency.
Converting PNG to WebP usually cuts file size at the same visual quality — WebP out-compresses PNG on most images — while keeping alpha transparency available.
PNG vs WebP
| PNG | WebP | |
|---|---|---|
| Compression | lossless — nothing discarded | lossy — some detail traded for size |
| Codec / container | lossless DEFLATE-compressed bitmap | WebP — written lossy here, with a quality knob |
| Typical file size | efficient for flat graphics, large for photos | smallest of the web formats at comparable quality |
| Best for | screenshots, graphics, logos and anything needing transparency | modern web images — photos and graphics alike |
| Strength | lossless, with a full alpha channel | smaller than JPEG/PNG at similar quality, with transparency |
| Watch out for | large for photographs — photos compress far better as JPEG or WebP | a few older apps and viewers still don't open it |
| Compatibility | universal | all modern browsers; some older desktop software lags |
| Transparency | yes — full alpha channel | yes — alpha supported |
| Animation | no | possible in WebP, but this converter writes still images |
How the conversion works
- Choose your PNG image. The button above opens the converter with WebP already selected as the target format.
- Set the quality from 1 to 100 (default 85) — higher keeps more detail, lower shrinks the file.
- Run the conversion and download the WebP image. Everything happens locally — ffmpeg compiled to WebAssembly runs in your browser tab, your image is never uploaded, and the page keeps working offline once it has loaded.
What to expect
This step is lossy. WebP discards some detail to hit its file sizes — at the default quality of 85 that's hard to see on photos, but sharp-edged graphics and text show artifacts sooner. Raise the quality toward 100 for critical images, and keep the PNG original in case you need to re-export.
Transparency survives: WebP supports alpha, so the transparent areas of your PNG stay transparent.
FAQ
How much quality do I lose converting PNG to WebP?
At the default quality of 85 the difference is hard to spot on photos. Graphics with sharp edges and text show lossy artifacts sooner — try quality 90+ there, or stick with a lossless format. Your PNG original is untouched either way.
How does the quality setting work for WebP?
Quality runs from 1 to 100 (default 85) and is mapped onto ffmpeg's encoder scale. Higher values keep more detail and grow the file; for most images 80–90 is the sweet spot. It only applies to lossy targets — PNG ignores it.
Is my PNG image uploaded when converting to WebP?
No. The conversion runs entirely in your browser with ffmpeg compiled to WebAssembly — your image never leaves your device, and the page keeps working offline once it has loaded.