Free SEO tools · No signup
Free SEO tools that do one job well
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 & metadata tools
Schema Markup Generator
Generate Organization JSON-LD structured data without writing it by hand.
FAQ Schema Generator
Turn questions and answers into valid FAQPage JSON-LD.
Meta Tag Generator
Create title, description, canonical, robots, and Open Graph tags.
SERP Preview
See how your title and description will look in Google before you publish.
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.