PNG to WebP Converter
Smaller than PNG, still transparent. Converted on your device.
Your files stay in this tab. There is no upload endpoint on this site.
The best of both formats
PNG's advantage has always been transparency; its weakness has always been file size. WebP keeps the full 8-bit alpha channel and compresses far more aggressively, which makes this conversion unusually one-sided for anything destined for the web. Logos, icons, UI assets and cutout product shots routinely drop 60–80% in size with no visible change.
Lossy WebP with transparency is fine
A common misconception is that transparency requires lossless compression. It does not. WebP stores the alpha channel separately from the colour data, so you can compress the colours lossily while keeping crisp, exact transparency. That is what this tool does at the default quality of 85, and it is why the savings over PNG are so large.
The one category to be careful with is flat graphics with hard edges — a logo in two solid colours, a screenshot of text. Lossy compression can produce faint halos around those edges. If you see that, raise the quality to 95 or keep the PNG.
Where the savings come from
PNG compresses with DEFLATE, a general-purpose lossless algorithm from 1991 that has no model of how images work. WebP uses predictive coding designed specifically for images: it predicts each block from its neighbours and stores only the difference. On photographic or gradient-heavy content this is not a close contest.
Common questions
Do my files get uploaded to a server?
No. Every tool on this site runs entirely in your browser using the Canvas and WebAssembly APIs. There is no upload endpoint in the page — you can confirm this yourself by opening your browser's Network tab while you convert a file. Nothing leaves the tab, which also means the tools keep working if you go offline after the page loads.
Is transparency kept?
Yes, in full. WebP stores an 8-bit alpha channel, exactly like PNG, so soft edges and partial transparency come through correctly.
How much smaller will the file be?
Typically 60–80% for photographic PNGs and screenshots. Flat graphics that PNG already handles well see smaller gains, often 20–40%.
Should I use lossless WebP instead?
Only for hard-edged flat graphics where you notice artifacts. Lossless WebP is still around 25% smaller than PNG, so it is worth it even then.