Eleven free browser tools that surface the most common technical website issues in seconds. No account. No installation.
Check crawler rules: Googlebot, Bingbot, GPTBot, ClaudeBot, Google-Extended. Finds typical blocking bugs in seconds.
Check robots.txt → XML-SitemapValidate XML sitemaps, resolve WordPress sitemap indexes recursively, find broken URLs in the sample.
Test sitemap → OnpageCrawl up to 100 pages: status, title, meta, H1, schema markup, internal links. Everything in one overview.
Crawl website → PageSpeedPerformance, Core Web Vitals, SEO and accessibility score via Google PageSpeed Insights. Mobile and desktop in one run.
Run speed test → robots.txtFetch the file, parse it, see all user-agents, allow/disallow rules and referenced sitemaps. Quick check for any domain.
Fetch robots.txt → sitemap.xmlURL count, sitemap index, lastmod coverage and XML syntax errors. Works with domain or direct sitemap path.
Analyze sitemap → JSON-LDExtract JSON-LD blocks, validate them and check for drift between schema and page content. With required-field heuristic.
Check schema → DNS · WHOISDNS records (A, AAAA, NS, MX, TXT) plus WHOIS lookup at a glance. Availability and configuration checked in seconds.
Check domain → Text ToolCharacter, word and sentence count plus reading time. Bonus: count occurrences of a single word — browser-only, no upload.
Analyze text → NetworkYour own IP address, browser, language and screen size — instantly visible. Helpful for geo-IP tests and support tickets.
Show IP → SecurityGenerate secure passwords in browser — length and character set configurable, cryptographically strong randomness. Nothing transmitted.
Generate password →Technical SEO usually breaks at the same patterns: robots.txt accidentally blocks a crawler, the sitemap lists 404 pages or critical meta tags are missing. These weaknesses cost visibility without any console reporting them. The tools here surface them in under a minute — a single faulty Disallow: / block has dropped entire domains out of Google.
ChatGPT, Perplexity, Claude and Google AI Overviews answer 25-30 % of all searches directly — using their own crawlers (GPTBot, OAI-SearchBot, PerplexityBot, ClaudeBot, Google-Extended). To be cited in AI answers, these bots must be explicitly allowed in robots.txt. Classic SEO tools often miss this.
The Rankmio robots.txt test checks every relevant AI crawler in one run and surfaces typical misconfigurations (e.g. User-agent: GPTBot with Disallow: /). More on the concept in the AI crawler glossary entry.
The eleven free tools on this page address the four layers that decide whether a website is found, crawled, understood and cited: crawl control (robots.txt, sitemap), page quality (Core Web Vitals, on-page check), structured data (Schema.org, JSON-LD) and operational basics (DNS, WHOIS, word count, IP).
| Layer | Tools | What it answers |
|---|---|---|
| Crawl control | robots.txt test, robots.txt check, sitemap tester, sitemap check | Can Google and AI engines actually crawl every relevant page? |
| Page quality | Website speed test, website crawler | Does the page load fast and present clean metadata to indexers? |
| Structured data | Schema.org check, website crawler (schema panel) | Are JSON-LD types correct, complete and consistent with content? |
| Basics | Domain check, word counter, IP, password generator | Is the domain healthy, is the content long enough, is access secure? |
Generative engines (ChatGPT Search, Perplexity, Google AI Overviews, Claude) decide which sources to cite based on three signals: technical accessibility (robots.txt, sitemap), content clarity (structured data, fast load) and entity authority (consistent metadata across pages). The tools here cover the first two signals in full. For the third — entity authority — a Rankmio account adds backlink and citation tracking.
Concrete example: a blog post without FAQPage schema is functionally invisible to Perplexity for Q&A queries, even if it ranks #2 on Google. Adding three FAQ entries with correct Schema.org markup typically moves citation rate measurably within four to six weeks.
A single tool gives a snapshot. A full audit links them: which pages got slower since the last crawl, which schema types disappeared in the latest CMS update, which competitor moved into your citation slots. That is what the Rankmio account adds on top — daily monitoring, snapshot history, and a GEO scoring loop that you cannot replicate with isolated free tools.
The free tools are perfect for a quick status. For ongoing monitoring, deeper analysis and SEO + GEO in one workflow, the Rankmio account picks up.
Complete website optimization in one platform: audit + GEO scoring + content studio + backlinks hub + position tracker. 10 free credits, no subscription.
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