Image SEO
Best Free Image SEO Tools in 2025
AltTagsForImages.com · Image SEO Guide · 2025
You don't need to spend money to have excellent image SEO. These free tools cover every aspect of image optimisation from alt text generation to structured data validation.
Alt Text Tools
| Tool | What It Does | Best For |
|---|
| AltTagsForImages.com | AI generates alt text, title, keywords from actual image content | All users — most accurate |
| WAVE (wave.webaim.org) | Audits pages for missing alt text | Finding gaps on existing pages |
| Screaming Frog (free up to 500 URLs) | Crawls site and lists all images with/without alt text | Technical audits |
Image Compression Tools
| Tool | Platform | Best For |
|---|
| Squoosh (squoosh.app) | Web | Best quality control, format conversion |
| TinyPNG / TinyJPG | Web | Fast batch compression |
| ImageOptim | Mac | Automatic lossless compression |
Page Speed and Core Web Vitals
| Tool | What It Measures |
|---|
| Google PageSpeed Insights | LCP, CLS, FID — with specific image recommendations |
| GTmetrix (free tier) | Full page speed analysis with image audit |
| WebPageTest | Detailed waterfall showing image load times |
Google's Own Tools
| Tool | Use For |
|---|
| Google Search Console | Monitor image search impressions and clicks |
| Google Rich Results Test | Validate structured data including ImageObject |
| Google PageSpeed Insights | Check image-related performance issues |
Structured Data Tools
- Schema.org — reference for all schema types including ImageObject
- Google Rich Results Test — validates your schema implementation
- Schema Markup Generator (technicalseo.com) — free schema code generator
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