Free PNG to WebP Converter
Convert PNG images to WebP — dramatically smaller files, supports transparency. No upload required.
PNG to WebP conversion can dramatically reduce file size — lossless WebP is typically 26% smaller than PNG, while lossy WebP reduces PNG sizes by 60-80% for photographic content. WebP also supports transparency (alpha channel), making it a direct PNG replacement for web use. Conversion runs locally in your browser using the Canvas API.
Click to select or drag & drop PNG files here
PNG supported · Multiple files · No size limitHow it works
Select your PNGs
Including any with transparent areas.
Converted with the alpha kept
WebP supports transparency, so cut-outs survive the conversion.
Download the WebP files
Usually a fraction of the PNG size, with the transparency intact.
WebP supports transparency exactly as PNG does, which is what makes it a drop-in replacement rather than a compromise. Unlike converting to JPG, which fills transparent areas with white, the PNG to WebP conversion preserves transparency fully. Your transparent PNG logos, icons and graphics will remain transparent in the WebP output while being significantly smaller in file size.
Why Convert PNG to WebP?
PNG files are often large because of their lossless compression. WebP supports both lossless and lossy compression — converting a PNG to WebP lossless typically reduces size by 26%, and lossy WebP can reduce PNG file sizes by 60-80% for photographic content while preserving transparency (alpha channel).
Lossless WebP Versus PNG, and the Transparency Advantage
WebP has two distinct modes, and the difference matters when the source is a PNG. Lossless WebP uses a completely different algorithm from lossy WebP: it applies colour transforms, palette detection and a form of LZ77 matching that can reference repeated pixel patterns anywhere earlier in the image. On the flat colours, sharp edges and repeated structures typical of screenshots, icons and diagrams, it usually beats PNG's DEFLATE by roughly 20–30% at identical pixel-for-pixel fidelity.
Lossy WebP goes considerably further — often 60–80% below the PNG — by discarding detail the way JPEG does, while still keeping the alpha channel. This is the combination neither older format offers: JPEG gives you lossy compression but no transparency, PNG gives you transparency but only lossless compression. WebP gives you both, which is why it suits transparent product images, overlays and UI assets on the web particularly well.
Two cautions. Very small images — icons below roughly 100×100 pixels — sometimes come out larger as WebP, because the container overhead outweighs the compression gain; check before replacing a favicon. And if the PNG is your only master copy, keep it. Lossy WebP is a distribution format; you do not want your sole archive of a graphic to be a lossy re-encode.