PNG to WebP
The only common target that keeps transparency and gets small.
Nothing is uploaded
Drop files here, or click to choose
Accepts PNG. No size limit, no sign-up.
This is the conversion that solves the problem PNG to JPG cannot. WebP compresses aggressively like JPEG but keeps the alpha channel like PNG, which makes it the right target for logos, icons, product cut-outs and UI assets.
Why this beats PNG to JPG for graphics
PNG to JPG has two failure modes on non-photographic images: transparency is destroyed, and JPEG produces visible ringing around sharp edges and text. WebP has neither problem. It carries a full alpha channel and handles hard edges far better.
The size difference is substantial. On our graphic test image — flat colours, hard edges, transparent background — the source PNG was 46 KB. As WebP at quality 75 it was 24 KB. As JPEG at the same quality it was 37 KB, and it had lost the transparency entirely.
Lossy WebP with alpha is a real thing
This surprises people who assume transparency implies lossless. WebP supports an alpha channel in both its lossy and lossless modes, which is exactly why it displaced PNG for so much web imagery.
The alpha channel itself is compressed losslessly even in lossy mode, so edges of a cut-out stay clean while the colour data underneath is compressed hard. That combination is not available in any other widely supported format.
When to keep the PNG instead
If the image must be pixel-perfect — a screenshot used as documentation evidence, a texture atlas, an icon that will be scaled by software — stay lossless. WebP also has a lossless mode, but if universal compatibility matters more than bytes, PNG is still the safer artefact.
It is also worth checking whether your PNG is simply unoptimised. A PNG written by a screenshot tool or an export dialogue is often much larger than it needs to be, and lossless optimisation alone can halve it without changing a single pixel.
No upload, no ceiling
Decoding and encoding both happen inside this browser tab through WebAssembly. Your file is never transmitted, so there is no size limit beyond your device memory, no task quota and no sign-up.
You can verify the claim directly: open DevTools, select the Network tab, and convert an image. Nothing carrying your file will appear.
Measured: flat-colour graphic, 1600×1000
Few colours, hard edges, transparent background.
| Quality | JPEG | WebP | WebP vs JPEG |
|---|---|---|---|
| 40 | 23.9 KB | 21.2 KB | -11% |
| 50 | 26.7 KB | 22.1 KB | -17% |
| 60 | 29.7 KB | 22.9 KB | -23% |
| 70 | 33.8 KB | 23.8 KB | -30% |
| 75 | 36.8 KB | 24.2 KB | -34% |
| 80 | 41.1 KB | 25.7 KB | -38% |
| 85 | 46.0 KB | 27.5 KB | -40% |
| 90 | 83.0 KB | 30.4 KB | -63% |
| 95 | 106.2 KB | 36.6 KB | -66% |
| Source PNG | 46.2 KB | ||
| Optimised PNG (lossless) | 40.6 KB | ||
Measured in Chromium with the same WebAssembly encoders this site ships. Your results will differ with your own images — the point is the shape of the curve, not the exact bytes. Measured: 2026-08-08
Frequently asked questions
Does WebP keep the transparent background?
Yes. WebP supports an alpha channel in both lossy and lossless modes, so transparency survives the conversion. This is the main advantage over converting to JPG.
How much smaller is WebP than PNG?
On our graphic test image the source PNG was 46 KB and the quality-75 WebP was 24 KB. Photographs compress even more dramatically. Screenshots vary depending on how well the original PNG was optimised.
Is this lossless?
Not at the default setting — the quality slider controls a lossy encode. If you need pixel-perfect output, keep the PNG and optimise it losslessly instead.
Will WebP work everywhere my PNG works?
In browsers, yes. Outside browsers, support is less consistent — some older desktop software and upload forms still reject WebP.
Is my image uploaded?
No. Everything runs locally in your browser. There is no server involved in the conversion at any point.
Other tools
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- PDF to JPGEvery page becomes an image, at the resolution you pick.
- PDF to PNGLossless pages, transparency kept.
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- Split PDFOne file per page, without handing the document over.
- HEIC to JPGYour photos never leave your device.
- Compress ImageSmaller files, without handing them over.
- WebP to JPGFor every program that still refuses to open .webp.
- PNG to JPGMuch smaller files — when the image is a photograph.
- JPG to PNGLossless from here on — but read this first.
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- WebP to PNGFor transparency plus software that will not open .webp.
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- Internet Speed TestFour numbers, measured honestly, with the method shown.