Shrink PNG graphics into modern WEBP files without losing transparency.
PNG (Portable Network Graphics) is a lossless raster format released in the mid-1990s as a royalty-free successor to GIF, after a licensing dispute over the LZW compression algorithm. It compresses images with the DEFLATE algorithm, the same method used by ZIP archives, so every pixel is preserved exactly with no generation loss on repeated saves. PNG also supports a full 8-bit alpha channel for smooth, partial transparency, unlike GIF's binary on/off transparency. These properties make it the standard choice for screenshots, logos, icons, and any graphic with sharp edges, flat colors, or text that needs to stay perfectly crisp.
WebP is a modern image format developed by Google and released in 2010, built on the intra-frame coding of the VP8 video codec. It supports both lossy and lossless compression in the same container, along with alpha transparency and simple animation, covering roughly the combined use cases of JPG, PNG, and GIF in a single format. In practice, WebP files are typically 25-35% smaller than a comparable JPEG or PNG at similar visual quality, which is why it has become a common recommendation for speeding up websites and improving Core Web Vitals scores.
WEBP keeps full alpha-channel transparency support like PNG, but with meaningfully smaller file sizes.
Yes, transparent areas in your PNG stay transparent in the resulting WEBP file.
Yes, this tool is completely free with no registration, no watermark, and no conversion limit.
No, the conversion happens locally in your browser using JavaScript. Your files are never uploaded to any external server.
There's no fixed limit enforced by the tool since everything runs in your browser rather than on a server.
For most everyday uses, the visual difference is negligible.