Convert PNG to WebP
The one conversion that gets you both a much smaller file and keeps transparency intact.
Options
All processing runs in your browser. No file leaves this device.
This is usually the right move for web assets. WebP keeps the alpha channel that JPG cannot represent, and for the kind of content people store as PNG — interface graphics, logos, illustrations with flat colour — the size reduction is often dramatic, far more than the 25–35% typical of photographs.
The quality slider starts at 100 here, and that setting matters more than usual. Measured on Chromium, encoding at 100 takes WebP's lossless path: decode the result and every pixel matches the source exactly. Firefox at the same setting comes extremely close but not bit-exact. Below 100 the encoder switches to its lossy mode, and on flat colour and hard edges — exactly what PNG content usually is — that becomes visible quickly. Leave it at 100 unless you have a reason not to.
Transparency is preserved as a real alpha channel, not composited. Semi-transparent pixels — soft shadows, anti-aliased edges — survive the conversion with their partial opacity intact.
Files are processed here on your machine, in parallel, and never uploaded.
Common questions
- Is the transparency preserved?
- Yes. WebP supports a full alpha channel, so transparent and semi-transparent pixels come through unchanged. This is the main advantage over converting to JPG.
- Can I get lossless WebP?
- On Chromium-based browsers, yes: at quality 100 the encoder uses WebP's lossless path, and we measured a decode of the output as bit-identical to the source. Firefox gets extremely close at the same setting but is not bit-exact. Safari cannot encode WebP at all — the page will tell you if that is the browser you are on.
- Are the files uploaded?
- No. Decoding, resampling and encoding all run inside this page. Nothing is transmitted, and there is no server that could keep a copy. Watch the Network tab in your devtools during a conversion if you want to confirm it.
- Can I convert many files at once?
- Yes — drop in as many as you like and they are processed in parallel across your CPU cores. A single file downloads directly; multiple files come back as a ZIP. In Chrome and Edge you can also write them straight into a folder you pick.
This converter is part of a full editing pipeline — tone, colour, lens correction and batch export all run the same way, without uploading.
Open the full pipeline