PNG is a reliable, lossless workhorse, but WebP was engineered specifically to beat it on file size — often dramatically — without necessarily sacrificing PNG's prized lossless quality or transparency support. This tool converts PNG images to WebP.
A format built by Google specifically to outperform PNG and JPEG
WebP was developed by Google and first released in 2010, explicitly designed to address a gap its engineers identified in existing formats: JPEG's lossy compression was efficient for photos but had no transparency support, while PNG's lossless compression supported transparency but produced comparatively large files — WebP was built to offer both lossy and lossless compression modes, transparency support in both, and, according to Google's published benchmarks, meaningfully smaller file sizes than either PNG or JPEG at comparable quality. Browser adoption was gradual for years, but by the early 2020s, WebP achieved support across every major browser, making it a genuinely practical everyday choice rather than a niche format.
What happens during PNG-to-WebP conversion
The tool decodes your PNG's exact pixel data — including any transparency — and re-encodes it using WebP's compression algorithm, which you can typically apply in either lossless mode (preserving every pixel exactly, similar to PNG's own approach, but generally still producing a smaller file) or lossy mode (achieving even greater size reduction at the cost of some quality, similar in spirit to JPEG but generally more efficient).
Where converting PNG to WebP is genuinely worthwhile
- Reducing website image payload without losing quality — WebP's lossless mode typically produces meaningfully smaller files than PNG for the same exact pixel-perfect image, directly improving page load performance with no quality tradeoff at all.
- Preserving transparency while cutting file size further — logos, icons and graphics that need transparency can move from PNG to WebP and keep that transparency support while benefiting from WebP's more efficient compression.
- Modern web performance best practices — serving WebP (often alongside a PNG fallback for older browsers, using HTML's
<picture>element) is a widely recommended technique in contemporary web performance optimization. - Reducing app or asset bundle size — applications that bundle image assets directly can benefit from WebP's smaller footprint compared to shipping the same graphics as PNG.
Frequently asked questions
Does WebP support transparency the same way PNG does? Yes — WebP supports a full alpha transparency channel in both its lossless and lossy modes, meaning you don't have to sacrifice transparency support to gain WebP's file size advantages over PNG.
Is lossless WebP always smaller than the equivalent PNG? Generally yes, often by a meaningful margin — Google's own benchmarks and independent testing have consistently shown lossless WebP producing smaller files than PNG for the same pixel-perfect image, though the exact savings vary depending on the specific image's content and complexity.
Is WebP supported everywhere PNG is? WebP now has broad support across all major modern browsers, but some older software, specific email clients, or certain legacy systems may still lack full support, which is why many websites serve WebP with a PNG or JPEG fallback for maximum compatibility.
Further reading
Google — WebP — Official documentation and compression benchmarks for the WebP format.
MDN — WebP image format — Browser support and technical details for WebP as a web image format.