Robots.txt Rule Match Simulator
Simulate how search engine bots and AI scraper spiders parse your robots.txt file and verify URL index pathways.
Simulator Sandbox
Crawl Paths Audit
| Tested URL Path | Access Status | Matching Rule |
|---|
Robots.txt Rule Match Simulator: Verifying Crawl Pathways
A website's robots.txt file is the gatekeeper of its organic search indexing. Located at the root of a domain (e.g. https://example.com/robots.txt), this file dictates which pages and resources web crawler bots (like Googlebot) are allowed to access and index, and which directories should remain blocked from crawl budgets.
However, robots.txt routing configuration is highly complex. Rules are evaluated sequentially, and matching behaviors vary significantly depending on the bot's User-Agent string, directory prefixes, and wildcards (like asterisk `*` or end anchors `$`). A **Robots.txt Rule Match Simulator** helps you test paths in a sandbox before deploying them to your live server, preventing accidental indexing blocks of vital content.
1. Crawl Budget Engineering and Indexability
Google allocates a finite crawl budget to every website—a limit to the number of requests Googlebot can execute on a domain per day. If a crawler wastes its budget requesting non-indexable, thin-content directories (like search filters, shopping carts, temp files, or dynamic query loops), it won't crawl your newly published blog posts or products:
- Disallow Bloat: Add block directives for dynamic scripts (e.g., `Disallow: /*?search=`) to preserve budget.
- Allow Override: Use
Allowtags to overwrite broader disallows. For example, disallow `/admin/` but allow `/admin/login`. - Order of Precedence: When evaluating rules, Googlebot prioritizes the most specific path match over general disallows, regardless of its position in the document.
2. Blocking AI Scrapers and Data Spiders
Modern technical SEO includes deciding which artificial intelligence models can scrape your content for LLM training datasets. You can declare specific directives for AI web bots:
User-agent: GPTBot
Disallow: /
User-agent: Google-Extended
Disallow: /In the example above, `GPTBot` (OpenAI) and `Google-Extended` (Google Gemini training bot) are blocked from accessing any site directories, while standard search crawlers (like Googlebot) continue to index the site for search.
3. Standard Directives Audit Checklist
| Directive Rule | Syntax Match | SEO Intention |
|---|---|---|
| Disallow: / | Blocks everything | Use only on staging servers. If active on production, it will completely deindex your site. |
| Disallow: /*.pdf$ | Blocks PDF extensions | Useful when you want to block search crawlers from downloading raw PDF resources. |
| Sitemap: [URL] | Direct link | Declares the absolute path of your sitemap.xml so crawlers discover it instantly. |
4. FAQ Section
Q: Does blocking a URL in robots.txt guarantee it won't show in search?
No. If external sites link to that blocked URL, Google may still index the link in search results (though it won't be able to read or display the content of the page). To guarantee a page is not indexed, allow crawl access and add a `` tag.
Q: Are user-agent names case-sensitive?
No. User-agent declarations are case-insensitive. Writing `User-agent: googlebot` is equivalent to `User-agent: Googlebot`.
Q: What happens if my robots.txt has no rules?
If the file is empty or returns a 404, search engines assume there are no crawl restrictions, allowing them to crawl every directory on the domain.