JPEG has been the web's default photo format for over three decades — but WebP was built to beat it on file size using more modern compression techniques. This tool converts JPG images to WebP.
Thirty years of compression research between the two formats
JPEG's core compression algorithm dates to 1992, developed using the image compression research and computing constraints of that era; WebP, released by Google in 2010, was built nearly two decades later on more advanced compression techniques (drawing on video codec research, since WebP's lossy mode is based on key-frame compression technology from Google's VP8 video codec) — meaning WebP benefits from roughly two additional decades of advances in compression algorithm research that simply didn't exist when JPEG's original standard was finalized.
What happens during JPG-to-WebP conversion
The tool decodes the JPG's pixel data (including any compression artifacts already present from the original JPEG encoding) and re-encodes it using WebP's more modern lossy compression algorithm — according to Google's published benchmarks, this typically produces a smaller file size than the original JPEG even at a visually comparable quality level, though converting from one lossy format to another does mean some additional, generally modest, quality consideration compared to starting from an uncompressed or losslessly compressed source.
Where converting JPG to WebP delivers real benefit
- Reducing website image weight for faster loading — since JPEG images are frequently the largest assets on a typical webpage, converting an existing JPEG image library to WebP is one of the more effective, relatively low-effort web performance improvements available.
- Improving mobile page load times and reducing data usage — smaller WebP files benefit users on slower connections or limited mobile data plans disproportionately compared to users on fast broadband.
- Meeting modern web performance and Core Web Vitals targets — since large, unoptimized images are a common cause of poor page speed scores, converting legacy JPEG assets to WebP is a standard remediation step in web performance audits.
- Reducing storage costs for large image libraries — sites or applications storing large volumes of photographic content can meaningfully reduce total storage footprint by converting their JPEG library to the more space-efficient WebP format.
Frequently asked questions
Will converting my JPG to WebP make it look worse? At a comparable quality setting, the visual difference is typically minimal to imperceptible, since WebP's more modern algorithm is generally more efficient than JPEG's older one — meaning you can often achieve a smaller file size at an equal or even better visual quality, rather than needing to trade quality for size.
Does converting a JPG to WebP undo any of the original JPEG's compression artifacts? No — any quality loss already present from the original JPEG encoding remains in the pixel data; WebP conversion doesn't restore lost detail, it simply re-compresses the already-JPEG-compressed pixel data using its own, generally more efficient, algorithm going forward.
Should I convert all my website's JPEGs to WebP? For most modern websites, yes, generally with a JPEG fallback served to the small remaining fraction of visitors on very old or unsupported software, using standard responsive image techniques — the file size savings typically provide a real, measurable page performance benefit for the vast majority of visitors.
Further reading
Google — WebP — Google's compression benchmarks comparing WebP against JPEG file sizes.
Wikipedia — JPEG — The original 1992 compression standard that WebP was designed to improve upon.