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Checks for modern image formats like WebP or AVIF
Rule IDimages/modern-format
CategoryImages
ScopePer-page
Severityinfo
Weight3/10

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Solution

Modern formats (WebP, AVIF) offer 25-50% better compression than JPEG/PNG with similar quality. Use <picture> with WebP/AVIF sources and fallbacks. Most browsers support WebP (97%+). AVIF offers even better compression but lower support (~92%). Convert images with tools like cwebp, squoosh, or sharp.

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Enable / Disable

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Disable this rule

squirrel.toml
[rules]
disable = ["images/modern-format"]

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Disable all Images rules

squirrel.toml
[rules]
disable = ["images/*"]

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Enable only this rule

squirrel.toml
[rules]
enable = ["images/modern-format"]
disable = ["*"]