Agent skill · marketing growth · sickn33
seo-images
Image optimization analysis for SEO and performance. Checks alt text, file sizes, formats, responsive images, lazy loading, and CLS prevention. Use when user says "image optimization", "alt text", "image SEO", "image size", or "image audit".
Why this skill is useful
Provides specific guidelines and best practices for optimizing images for SEO that the AI wouldn't reliably generate on its own.
What it needs
About 4k tokens when loaded. Last updated 2026-08-07. 44,571 stars on the source repository.
What this skill does
Image Optimization Analysis When to Use Use when auditing image SEO, alt text, file sizes, formats, or lazy loading. Use when the user wants image-specific performance recommendations. Use when checking media quality signals that affect both SEO and Core Web Vitals. Checks Alt Text Present on all <img> elements (except decorative: role="presentation") Descriptive: describes the image content, not "image.jpg" or "photo" Includes relevant keywords where natural, not keyword-stuffed Length: 10-125 characters Good examples: "Professional plumber repairing kitchen sink faucet" "Red 2024 Toyota Camry sedan front view" "Team meeting in modern office conference room" Bad examples: "image.jpg" (filename, not description) "plumber plumbing plumber services" (keyword stuffing) "Click here" (not descriptive) File Size Tiered thresholds by image category: Image Category Target Warning Critical ---------------- -------- --------- ---------- Thumbnails < 50KB > 100KB > 200KB Content images < 100KB > 200KB > 500KB Hero/banner images < 200KB > 300KB > 700KB Recommend compression to target thresholds where possible without quality loss. Format Format Browser Support Use Case -------- ----------------- ---------- WebP 97%+ Default recommendation AVIF 92%+ Best compression, newer JPEG 100% Fallback for photos PNG 100% Graphics with transparency SVG 100% Icons, logos, illustrations Recommend WebP/AVIF over JPEG/PNG. Check for <picture> element with format fallbacks. Recommended <picture> Element Pattern Use progressive enhancement with the most efficient format first: The browser will use the first supported format. Current browser support: AVIF 93.8%, WebP 95.3%. JPEG XL: Emerging Format In November 2025, Google's Chromium team reversed its 2022 decision and announced it will restore JPEG XL support in Chrome using a Rust-based decoder. The implementation is feature-complete but not yet in Chrome stable. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills sickn33/seo-images--b6c4f0