Convert JPG to WebP

Converting JPG to WebP is the most frequently performed image optimization on the modern web, and for good reason. At equivalent perceptual quality (measured by SSIM), WebP lossy compression produces files 25-35% smaller than JPG. This is achieved through WebP's use of VP8 prediction-based encoding, which analyzes macroblocks using spatial prediction from already-decoded pixels — a technique borrowed from video compression that outperforms JPG's simpler DCT approach. At quality 80, a 250KB JPG photograph typically becomes a 160-175KB WebP with no visible difference.

Google's PageSpeed Insights and Lighthouse specifically flag JPG images as opportunities for WebP conversion, often estimating savings of 0.5-2 seconds in Largest Contentful Paint (LCP) for image-heavy pages. For an e-commerce site serving 50 product images per category page, switching from JPG to WebP can reduce image payload by 2-4MB. This directly impacts conversion rates: studies by Akamai show that a 100ms improvement in load time increases conversion rates by 7% on mobile devices.

WebP's compression advantage over JPG grows at lower quality settings. At quality 50 (suitable for thumbnails and preview images), WebP can be 40-50% smaller than equivalent JPG. This makes WebP especially valuable for image-heavy applications like social media feeds, real estate listings, and news aggregators where dozens of images load simultaneously. Instagram's web version, Pinterest, and Google Images all serve WebP by default to compatible browsers.

The conversion process maps naturally between formats since both use lossy compression on photographic content. JPG's YCbCr color space aligns with WebP's internal representation, so color accuracy is maintained without gamut mapping. EXIF metadata (camera settings, GPS coordinates, timestamps) can be preserved or stripped during conversion. For privacy-conscious applications, stripping EXIF during the JPG-to-WebP conversion is a convenient way to remove location data before publishing user-uploaded photos.