Definition
Image SEO encompasses all optimization practices for search engine visibility. This includes descriptive file names, relevant alt attributes, lossless compression, appropriate formats (WebP, AVIF), lazy loading, explicit dimensions (width/height), ImageObject structured data, and image sitemaps. Google Images accounts for approximately 20% of all Google searches, making it a significant and often overlooked traffic source.
Key Points
- WebP format offers 30% more compression than JPEG at equal quality
- The alt attribute is the primary text signal for Google Images
- Lazy loading improves performance without impacting indexation
- Images must always have defined width and height dimensions (CLS)
Practical Examples
Frequently Asked Questions
WebP is the recommended format in 2026: it offers excellent compression, is supported by all modern browsers, and is well-indexed by Google. AVIF is even more performant but less supported.
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Last updated: 2026-02-07