Modern Image Formats

Checks for modern image formats like WebP or AVIF


Rule ID	`images/modern-format`
Category	Images
Scope	Per-page
Severity	info
Weight	3/10

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.

Enable / Disable

Disable this rule

squirrel.toml

toml

[rules]
disable = ["images/modern-format"]

Disable all Images rules

squirrel.toml

toml

[rules]
disable = ["images/*"]

Enable only this rule

squirrel.toml

toml

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

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