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A Brief History of WebP
Google announced the WebP format in 2010 as a new open standard for lossy compressed true-color graphics on the web, aiming to produce smaller files of comparable image quality to the older JPEG scheme. It is based on the VP8 video codec's intra-frame coding. Over the years, lossless compression and transparency support were added, making WebP a complete replacement for both JPEG and PNG.
WebP vs. JPEG (Lossy Compression)
WebP’s lossy compression is designed to beat JPEG. According to Google's studies, WebP lossy images are
25-34% smaller than comparable JPEG images at equivalent structural similarity (SSIM) quality index.
It achieves this through predictive coding. Predictive coding uses the values in neighboring blocks of pixels to predict the values in a block, and then only encodes the difference (residual). This is far more efficient than JPEG's block-by-block DCT approach, especially for smooth gradients and solid colors.
WebP vs. PNG (Lossless Compression)
WebP lossless images are
26% smaller in size compared to PNGs. What makes WebP truly unique is that it supports
lossy transparency. You can have an image with an alpha channel (like a PNG logo with a drop shadow) but compress the color data with lossy algorithms (like a JPEG). This creates incredibly small files for transparent graphics that used to require massive PNG files.
SEO and Core Web Vitals
If you run a website, switching your images to WebP is one of the highest-leverage optimizations you can make. Google's
Largest Contentful Paint (LCP) metric directly measures how fast the main visual elements load. Since WebP files are smaller, they download faster, improving your LCP score and, by extension, your search rankings.
How to Convert Your Images
You don't need to reinstall Photoshop or buy new software. You can use PDFBucket's free
Format Converter to convert any JPEG or PNG to WebP instantly in your browser, completely free and without uploading your files to a server.