JPG to WebP re-encodes standard JPEG photos into WebP, the image format Google introduced in 2010 specifically to shrink web page weight without a visible drop in quality. WebP uses a more modern predictive compression scheme (derived from the VP8 video codec) that generally squeezes 25-35% more size out of a photo than JPEG at a visually comparable quality level — for a website serving thousands of product photos or blog images, that difference adds up to real bandwidth savings and faster page loads, which is also a direct input into Google's Core Web Vitals scoring and, by extension, search ranking.
WebP supports both lossy and lossless compression plus an alpha transparency channel, so it can effectively replace JPEG and PNG with a single format depending on the quality setting chosen. For a photographic image being converted from JPEG, lossy WebP at a moderate-to-high quality setting is the relevant mode — the encoder analyzes the image and re-compresses it more efficiently than JPEG's three-decade-old DCT-based algorithm manages, at a comparable or better visual result. The quality slider works the same conceptual way JPEG's does: lower values produce smaller files with more visible compression artifacts, higher values produce larger files that look closer to the source.
Browser support, once WebP's biggest limitation, is no longer a practical concern — every major browser released since 2020 (Chrome, Firefox, Edge, and Safari from version 14 onward) decodes WebP natively, and most CMS platforms and CDNs now serve it by default or offer it as an automatic option. The remaining reasons to think twice before converting are narrower: an old email client rendering an image inline, a print workflow that expects JPEG or PNG, or software with a hard WebP compatibility gap. For anything destined for a modern website, WebP is now the more efficient default rather than the exception.
Have PNGs to convert too? PNG to WebP handles those, preserving transparency in the process.
