What is Image SEO?
Making images retrievable and fast: descriptive filenames, alt text, captions, responsive sizes, lazy loading, and accurate dimensions to protect CLS.
Related terms
Alt Text
The text alternative describing an image for screen readers and parsers. One of the most common detectable accessibility failures, and part of every audit baseline.
Lazy Loading
Deferring below-the-fold images, video, and iframes until near the viewport. It trims initial page weight, the strongest lever on Core Web Vitals pass rates after server response.
Cumulative Layout Shift (CLS)
The Core Web Vital measuring visual stability: how much content jumps around while loading. Reserve space for images, ads, and embeds with width, height, or aspect-ratio boxes.
On-Page SEO
Optimizing individual pages: titles, headings, content depth, internal links, images, and schema. On-page work decides relevance once technical SEO has made the page reachable.
Title Tag
The clickable headline in search results and the strongest on-page relevance signal. Google rewrites most titles, so clarity and completeness beat rigid length rules.
Meta Description
The optional summary that can become the result snippet. Absence is not a penalty and Google rewrites most descriptions, so prioritize valuable pages where controlled wording earns clicks.