How WebP and AVIF Formats Can Cut Image File Sizes by Up to 92%

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Images typically account for 60–70% of total page weight and are a leading cause of poor Core Web Vitals scores, particularly Largest Contentful Paint (LCP). Switching from JPEG to WebP can reduce file sizes by 60–80% at equivalent visual quality, while the newer AVIF format can achieve reductions of up to 92%. WebP now enjoys over 97% global browser support as of 2026, making legacy JPEG fallbacks largely unnecessary. A real-world test on a 2400×2400 product photo showed file size drop from 1.8 MB to around 210 KB in WebP and 150 KB in AVIF. Bulk conversion tools can automate the process for large image catalogs, making format migration practical for e-commerce sites with hundreds of product images.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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