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Free SEO & link building tools
20 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 toolTechnical SEO
Robots.txt Generator
Build a valid robots.txt with allow, disallow and sitemap.
Open toolXML Sitemap Generator
Turn a list of URLs into a valid XML sitemap.
Open toolSitemap Validator
Check your XML sitemap for errors and limits.
Open toolHtaccess Redirect Generator
Generate 301 and 302 redirect rules for Apache and Nginx.
Open toolDNS Lookup
Look up A, AAAA, MX, TXT, NS and CNAME records.
Open toolSSL Certificate Checker
Check a site's SSL certificate, expiry and chain.
Open toolHTTP Header Checker
Inspect response headers and follow the redirect chain.
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.