Image Optimization · AuditJet Glossary
WebP
A modern image format developed by Google that provides superior compression and quality compared to JPEG and PNG.
WebP images are typically 25–35% smaller than equivalent JPEG images at the same quality. Smaller images mean faster LCP because less data needs to be downloaded. WebP supports both lossy and lossless compression, transparency (like PNG), and animation. All major browsers now support WebP, making it the recommended format for photographs and complex images.
Related terms
A next-generation image format based on the AV1 video codec that provides better compression than WebP and JPEG.
The time from page navigation start until the largest image or text block visible in the viewport has finished rendering.
A technique that defers loading of off-screen images and iframes until they are near the user's viewport.
Frequently asked questions
What is WebP?
A modern image format developed by Google that provides superior compression and quality compared to JPEG and PNG.
How does AuditJet measure WebP?
AuditJet runs automated Google Lighthouse audits that surface WebP scores alongside actionable fix guidance. You can track WebP trends across all your pages and receive alerts when the metric regresses.
Monitor WebP continuously
AuditJet tracks Core Web Vitals on a schedule with revenue impact alerts — powered by Google Lighthouse and Google PageSpeed Insights.
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