robots.txt Tester

Free, no signup. robots.txt gives no warning when a misplaced Disallow hides half a site from Google — it just quietly works. Test any list of URLs against it with a matcher ported from Google's own open-source parser — longest-match-wins, wildcards, sub-agent fallback, and status-code semantics handled exactly the way Google does it.

1. robots.txt
2. Pages to test
3. Bots

Example data — replace with your own

Runs entirely in your browser — nothing you paste is uploaded or stored. The server is only used to fetch a site's robots.txt or sitemap (browsers can't — no CORS). Anonymous run-level outcome counters may be used for aggregate research; URLs, domains, IPs, and identifiers are never included, and no statistic is released below 100 runs.

Feedback
Report a bug

Found something broken in Robots Txt Tester? Let us know what happened — this goes straight to a private triage queue, not a public list.

What will be sent
 No tool inputs, uploads, pasted source, complete results, query parameters, or URL fragments are attached automatically. You can edit or remove the selected passage above. Browser and anti-abuse metadata is processed for spam prevention. 

Sample report Example data — real, verified result

Given this robots.txt:

User-agent: *
Disallow: /search
Allow: /search/howsearchworks

…then test /search/howsearchworks and /search?q=redirects against Googlebot. The matrix comes back:

  • Longest match wins, not first match. /search/howsearchworks is allowed even though Disallow: /search also matches it — the longer Allow: /search/howsearchworks on line 3 is more specific and overrides it.
  • The second URL has no exception. /search?q=redirects is blocked by Disallow: /search on line 2 — nothing more specific matches it.
  • Click a verdict to see why. Clicking either cell highlights the exact line that decided it — see what "blocked"/"allowed" and the L-numbers mean and the common-mistakes list below for how order-independent matching trips people up.
  • Background reading. The robots.txt guideA plain-text file at the root of a host that tells crawlers which URLs they may and may not request. It controls crawling, not indexing — a blocked URL can still be indexed if it's linked from elsewhere. covers every directive this matcher supports.

How to use it

  1. Load a robots.txt. Enter a domain to fetch the live file, or switch to Paste to test a draft that isn't published yet. In fetch mode, full URLs on other subdomains automatically use that origin’s own /robots.txt.
  2. Add the pages to test. Paste URLs (full or bare paths), upload a .txt/.csv list, or pull them straight from the site's sitemap.xml.
  3. Pick the bots. Choose the crawlers you care about, or hit AI crawler audit to load the AI bots (GPTBot, ClaudeBot, Google-Extended, and the rest) in one click.
  4. Read the matrix. Every URL × bot cell shows allowed or blocked. Click a cell to see the exact rule that decided it, highlighted in the file.

How it works

The matcher is ported from Google's open-source robots.txt parser, so it decides allow/block the way Googlebot actually does — not with a naive "first match wins" rule that most testers use. That means longest-match-wins (the most specific Allow/Disallow path takes precedence regardless of order), * and $ wildcards, percent-encoding normalisation, and sub-agent fallback (a bot with no group of its own falls back to User-agent: *).

Crawl-delay is crawler-specific, not part of this Google matcher. Google does not process it. Bing documents 1–20 second values. This tool reports Google-style Allow/Disallow decisions and never pretends a Crawl-delay line changes Googlebot’s result.

All of that runs in your browser. The server is only touched to fetch a live robots.txt or sitemap, because browsers can't request them cross-origin. It also models robots.txt status-code semantics: most 4xx responses are treated as "no robots.txt," but 429 is a temporary failure like a 5xx or timeout. Temporary failures can initially pause crawling; Google may also reuse its last known good file, which a point-in-time tester cannot observe.

Features

  • Google-accurate matching: longest-match-wins, wildcards, sub-agent fallback, status-code rules.
  • Blocked/allowed matrix across as many URLs and bots as you like.
  • Click any verdict to see the exact matching line highlighted in the file.
  • One-click AI crawler audit for the major LLM and AI-search bots.
  • Built-in linter that flags common robots.txt mistakes.
  • Fetch by domain, upload a URL list, or pull URLs from a sitemap — including a separate live robots.txt for each entered subdomain (up to 10 origins per run).
  • Privacy: matching is fully client-side — pasted files never leave your machine.

Common mistakes it catches

  • Assuming rule order matters — it doesn't for Google; the most specific path wins.
  • Blocking a resource (CSS/JS) that the page needs to render, then wondering why rankings drop.
  • Using robots.txt to keep a page out of the index — disallow stops crawling, not indexing; use NoindexNoindex is a directive that tells search engines to keep a page out of their index, so it won't appear in search results. It works only on pages a crawler can actually fetch — a page blocked in robots.txt can never be noindexed. for that.
  • A stray Disallow: / under User-agent: * that quietly blocks the whole site.

Limitations

This checks Google-style robots.txt matching only — it tells you whether a bot is allowed to crawl a URL, not whether the page is indexable (a page can be crawlable and still carry a noindex). Fetch-by-domain reads the robots.txt exactly as served; if a site returns different robots.txt to different user-agents or regions, you'll see the version your fetch received. A robots.txt file is scoped to its origin, so fetch mode requests each entered subdomain’s own file. Paste mode deliberately uses the one pasted draft for every URL. Non-Google crawler behavior is not inferred here; consult that crawler’s own documentation before relying on system-specific extensions.

Frequently asked questions

Does robots.txt stop a page from being indexed?

No. Disallow blocks crawlingCrawling is how search engines use automated bots (like Googlebot and Bingbot) to discover URLs and download pages. A page has to be crawlable to be indexed, but crawling on its own isn't a ranking factor., not indexingStoring a crawled page in the search index so it can appear in results. Crawled is not the same as indexed — Google selects what to keep, and indexing isn't guaranteed.. If other pages link to a disallowed URL, Google can still index it (usually without a snippet). To keep a page out of the index, let it be crawled and add a noindex meta tag or X-Robots-Tag header — which means you must not also disallow it, or Google can never see the noindex.

Does the order of rules in robots.txt matter?

Not for Google. Google applies the most specific rule — the longest matching path — regardless of where it sits in the file, so an Allow can override an earlier Disallow. This tool matches the same way. Some other crawlers use first-match-wins, so keep rules unambiguous.

What is the difference between Disallow and noindex?

Disallow (in robots.txt) tells crawlers not to fetch a URL. noindex (a meta tag or HTTP header on the page) tells them not to keep it in the index. They solve different problems, and combining them backfires: a disallowed page is never fetched, so its noindex is never seen.

Will blocking CSS or JavaScript in robots.txt hurt SEO?

It can. Google renders pages to understand them, so if it cannot fetch the CSS and JS a page needs, it may misjudge the layout, content, or mobile-friendliness. Allow the resources required to render your pages and only block genuinely non-essential paths.

How do I block AI crawlers with robots.txt?

Add a user-agent group for each AI bot — such as GPTBot, Google-Extended, ClaudeBot, CCBot, and PerplexityBot — with Disallow: /. Use the AI crawler audit button to load them and confirm your rules match. Note that robots.txt compliance is voluntary; reputable bots honour it, but it is not an access control.

Next steprobots.txt Generator — generate a replacement robots.txt with the directives you meant to ship.

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