PNG to WEBP

Convert PNG to WebP to reduce file size.

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What is WebP?

WebP is an image file format that offers both lossy compression and lossless compression. It is derived from the image coding format VP8 and is considered the sister project of the WebM multimedia format. It was developed by Google after the acquisition of On2 Technologies. It is released under the terms of the BSD license.

WebP supports a maximum pixel size of 16383x16383. Lossy compressed WebP only supports 8-bit YUV 4:2:0 format. Lossless compressed WebP supports VP8L encoding and 8-bit ARGB color space. Both lossy and lossless compression support Alpha transparency channel, ICC color profile, and XMP metadata.

WebP has static and animated modes. Animated WebP supports both lossy and lossless compression, ICC color profile, XMP metadata, and Alpha transparency channel.

What are the advantages of WEBP over PNG and JPG?

The advantages of WebP lie in its better image data compression algorithm, which can result in smaller image size while maintaining the same image quality as perceived by the human eye. It also has features such as lossless and lossy compression modes, Alpha transparency, and animation, providing excellent, stable, and consistent conversion results from JPEG and PNG.

When WebP compresses JPEG to 90% of the original image quality, the image size decreases by approximately 50%. When WebP compresses JPEG to 80% of the original image quality, the image size decreases by 60%-80%.

Compared to JPEG, the superior compression performance of lossy WebP is mainly due to its advanced predictive coding technology and compression efficiency improved by macroblock adaptive quantization, while the use of Boolean arithmetic coding instead of Huffman coding improves compression performance by 5%-10%.

According to early tests by Google, lossless WebP compression can reduce file size by 45%, and even after PNG files are processed with PNGCRUSH and PNGOUT, WebP can still reduce file size by 28%. Currently, WebP can reduce image size by an average of 70%. WebP is the future trend of image formats.