Free tools · No signup
Free SEO & link building tools
35 tools that actually work, built by the team behind Lynx. Generate, check and analyse the building blocks of SEO. Nothing to install, most run entirely in your browser.
Content & writing
Word Counter
Count words, characters, sentences and reading time as you type.
Open toolKeyword Density Checker
See your top words and phrases and catch keyword stuffing.
Open toolReadability Checker
Flesch reading ease and grade level for any text.
Open toolSERP Snippet Preview
Preview how your title and description show in Google.
Open toolSlug Generator
Turn any title into a clean, SEO-friendly URL slug.
Open toolMeta & structured data
Meta Tag Generator
Generate title, description, Open Graph and Twitter tags.
Open toolSchema Markup Generator
Build JSON-LD structured data for rich results.
Open toolFAQ Schema Generator
Create FAQPage JSON-LD from your questions and answers.
Open toolOn-Page SEO Checker
NewAudit titles, meta descriptions, H1s and on-page basics for up to 10 URLs.
Open toolOpen Graph Checker
NewPreview your link on Facebook, X, LinkedIn, Slack and Discord.
Open toolSchema Markup Validator
NewValidate JSON-LD from a URL or pasted code against Google's requirements.
Open toolTechnical SEO
Robots.txt Generator
Build a robots.txt, block AI training bots, keep AI search.
Open toolXML Sitemap Generator
Turn a list of URLs into a valid XML sitemap.
Open toolSitemap Validator
Check any sitemap by URL: errors, noindex, redirects, robots.txt.
Open toolHtaccess Redirect Generator
301 and 302 redirects for Apache, Nginx, Netlify and Vercel.
Open toolHTTP Header Checker
Headers, redirect chain and a security header grade.
Open toolRobots.txt Tester
NewTest which URLs Googlebot, Bingbot and AI crawlers can access.
Open toolRedirect Checker
NewTrace redirect chains and status codes for up to 20 URLs at once.
Open toolNoindex & Indexability Checker
NewCheck if pages can be indexed: noindex, X-Robots-Tag, canonical, robots.txt.
Open toolAI Crawler Checker
NewSee if GPTBot, ClaudeBot, PerplexityBot and other AI crawlers can reach your site.
Open toolHreflang Generator
NewBuild valid hreflang tags for HTML, XML sitemaps or HTTP headers.
Open toolHreflang Checker
NewValidate hreflang codes, return links, self-references and x-default on any URL.
Open toolDomain & site research
DNS Lookup
DNS records plus SPF, DKIM and DMARC checks.
Open toolSSL Certificate Checker
Check a site's SSL certificate, expiry and chain.
Open toolCMS & Tech Stack Detector
NewFind out which CMS, framework, analytics and CDN a site uses.
Open toolDomain Age Checker
NewSee when a domain was registered, its registrar, expiry and first archive.
Open toolGoogle Algorithm Update History
NewEvery Google-confirmed ranking update since 2021, plus major milestones back to 2011.
Open toolLinks & outreach
UTM Campaign URL Builder
Build tagged campaign URLs for analytics tracking.
Open toolURL Encoder / Decoder
Percent-encode and decode URLs and query parameters.
Open toolEmail Permutator
Generate likely email patterns for outreach prospecting.
Open toolDisavow File Generator
Build a Google disavow file from toxic domains and URLs.
Open toolAnchor Text Generator
Generate a natural mix of anchor text for link building.
Open toolTools handle the details. Lynx handles the links.
These tools fix the small things. Lynx is the AI agent that does the big one: building your backlinks automatically across 2,000+ platforms, monitored for 90 days. First link free.