About
SEO tools that respect your time
MarsGeo is a small, independent project building fast, no-nonsense SEO utilities for marketers, developers and founders.
What we do
We ship 256+ free tools — structured-data (JSON-LD) generators, robots.txt and sitemap builders, canonical and meta tools, an on-page audit, and more. Everything runs in your browser: paste your HTML or data, get a clean, copy-ready result. No account needed.
Private by design
The free tools run entirely client-side. Your HTML and content are never uploaded to our servers just to generate a snippet.
Built for scale
When you outgrow the free tools, Pro adds bulk audits, programmatic SEO page generation and API access.
AI-friendly
Every page has a clean Markdown twin and we publish an llms.txt, so assistants can read and cite our docs.