41 browser tools and 15 command-line tools for technical SEO, schema, content and AI-search visibility. The browser tools run entirely on your machine — nothing is uploaded.
These tools are built and maintained by SEO ProCheck, the technical SEO and AI-search practice at seoprocheck.com, where the research and guides behind them are published. The full list also lives at seoprocheck.com/tools.
Generate valid JSON-LD schema markup for Articles, Products, Local Business and more.
Build FAQPage JSON-LD from your questions and answers in seconds.
Create HowTo structured data with ordered steps, ready to paste.
Generate BreadcrumbList JSON-LD for cleaner SERP breadcrumbs.
Produce VideoObject schema so your videos qualify for rich results.
Generate Event schema with dates, venue and ticket info.
Check whether AI crawlers (GPTBot, ClaudeBot, PerplexityBot…) can access your site.
Generate an llms.txt file to guide AI models around your site.
Format citations cleanly for reference and E-E-A-T signals.
Check how clearly your content defines its core entities.
AI Content Readiness Checker — a free SEO ProCheck tool.
Generate a correct robots.txt with crawl rules and sitemap.
Generate hreflang tags for multi-language / multi-region pages.
Create canonical link tags to prevent duplicate-content issues.
Build meta robots directives (index/follow, max-snippet…).
Generate an XML sitemap from your list of URLs.
Build .htaccess 301/302 redirect rules.
Trace redirect chains and spot wasteful hops.
Inspect a URL's HTTP response headers.
Preview how your page looks in Google search results.
Count words, characters, sentences and reading time.
Measure keyword density and spot over-optimization.
Analyze your H1–H6 structure for hierarchy issues.
Assess readability / reading grade level of your text.
Spot topical gaps against target keywords.
Create a direct Google review link for your business.
Check Name/Address/Phone consistency for local SEO.
Build LocalBusiness schema with NAP, hours and geo data.
Build Open Graph tags for rich social sharing.
Generate Twitter/X Card markup.
Generate title, description and meta tags for any page.
Preview how your link renders across social platforms.
Encode or decode Base64 strings.
Encode or decode URLs safely.
Turn any title into a clean, SEO-friendly URL slug.
Generate placeholder text for mockups.
Convert between Unix timestamps and human dates.
Validate and format JSON.
Build UTM-tagged campaign URLs for analytics.
Convert characters to/from HTML entities.
Test regular expressions against sample text live.
Find thin & near-duplicate pages, then get told what to add — never what to delete.
CLITurn the pages already ranking into a brief: table stakes vs coverage gaps.
CLICan an AI lift an answer off your page? Scores answer proximity and extractability.
CLIFind pages that discuss another page's subject without linking — with the sentence to link from.
CLIFind pages bleeding search traffic in GSC exports, ranked with enrich-first fixes.
CLIFind URLs competing for the same query in GSC data, severity-scored.
CLIVoice-of-customer mining for any subreddit — share of voice, complaints, the venue gap.
CLICrawl-budget analysis from server logs, per bot, including AI crawlers.
CLIFind redirect chains and loops, then emit the rules that collapse them.
CLICatch the missing return tag that kills international rankings.
CLICore Web Vitals: CrUX field data against Lighthouse lab, with the likely reason they diverge.
CLIValidate JSON-LD across a whole sitemap — 17 rich-result types, CI-ready.
CLISee what schema types the pages outranking you ship that you don't.
CLIValidate and generate llms.txt, the Markdown map that tells AI models what your site is.
CLIAudit robots.txt for AI crawler policy — which of 27 AI bots you actually allow.
CLIThis site collects 41 browser tools and 15 command line tools for technical SEO, structured data, content and AI search visibility. It is published by SEO ProCheck, where the research and guides behind the tools are written. Every tool is free, and none of them asks you to sign up.
The browser tools sit in seven groups. Schema & Structured Data writes JSON-LD for articles, products, FAQs, events and more. GEO & AI Visibility checks which AI crawlers can reach you and how clearly your content defines its subject. Technical SEO covers robots.txt, canonicals, hreflang, sitemaps, redirects and headers. Content Analysis measures length, headings, readability and keyword use. Local SEO handles name, address and phone checks, local business schema and review links. Social & Meta writes Open Graph, X card and meta tags. Developer Utilities holds encoders, a JSON validator, a regex tester and a UTM builder. The Command Line group lists the 15 Python scripts for jobs a browser cannot do, such as whole-site crawls and log analysis.
The browser tools run in your browser, so the text, code and URLs you paste are not uploaded. Three tools also offer an optional live check: the AI Crawler Checker, the Redirect Chain Checker and the HTTP Header Checker. That live check sends the URL you type to a public proxy. If you would rather keep it private, paste the robots.txt file or the curl output instead, and nothing leaves your browser.