Convert JPEG to WebP

JPEG's DCT-based compression was state of the art three decades ago, but it lacks features modern web development demands. WebP, developed by Google and released in 2010, employs VP8-derived predictive coding that analyzes neighboring pixel blocks to compress more efficiently. In controlled tests, WebP lossy produces files 25-34% smaller than JPEG at equivalent SSIM quality scores. For a photography portfolio serving 50 high-resolution hero images, this translates to roughly 3-5 MB of bandwidth saved per page load.

The JPEG specification was designed for photographic content and handles smooth tonal gradients well, but it struggles with sharp edges and flat color regions — exactly the content mix found on modern websites. WebP handles both photographic and graphic content in a single format because it supports both lossy and lossless modes plus alpha transparency. A product page with a photograph, a transparent logo, and an infographic can use one format throughout instead of juggling JPEG and PNG.

Browser support for WebP crossed the 97% threshold in early 2023, covering Chrome, Firefox, Safari 14+, and Edge. The only notable holdout is Internet Explorer, which Microsoft discontinued in June 2022. For the rare legacy visitor, the HTML picture element with a JPEG fallback takes two lines of markup. This near-universal support means the historical hesitation around WebP adoption is no longer justified for any greenfield project.

One technical nuance JPEG users should understand: WebP lossy at quality 75-80 produces visually comparable results to JPEG quality 85-90. The quality scales are not equivalent because the underlying compression algorithms differ fundamentally. When converting from JPEG to WebP, do not simply transfer the same quality number — instead, target a WebP quality of 75-80 for photographic content to achieve optimal size-to-quality balance.