Free SEO tools · No signup
Free SEO tools. No signup.
Sundrio is a growing set of single-purpose generators and checkers for technical SEO — robots.txt, XML sitemaps, redirects, hreflang, schema markup, and metadata. Open a tool and use it. No account, no paywall, no upsell.
Free forever · No usage caps · Nothing to install
User-agent: *
Allow: /
Crawl-delay: 10
Sitemap: https://example.com/sitemap.xmlOutput from the Robots.txt Generator — copy-ready in one click.
Crawl control tools
Crawl control overview →Indexation tools
Indexation overview →Redirect tools
Redirects overview →Schema markup tools
Schema markup overview →Metadata tools
Metadata overview →Why Sundrio
No signup, ever
Every tool works the moment the page loads. No account, no email gate, no free-trial countdown.
One job per tool
No suites or dashboards. Each page does a single task, does it fast, and gets out of your way.
Honest about limits
Every tool states what it checks and what it cannot, so you know exactly what a clean result means.
Common questions
Are these SEO tools really free?
Yes. Every tool on Sundrio is free, with no account, no trial, and no usage cap. Open a tool and use it.
Do I need to create an account?
No. Nothing on Sundrio requires a signup or an email address.
How do the live checkers work?
Generators build their output from what you type into the form. Live checkers — like the redirect checker and hreflang checker — fetch the URL you provide and show you exactly what they found.
Who builds Sundrio?
Sundrio is a small, growing collection of single-purpose SEO utilities. New tools ship when they are reliable, not on a schedule.