Robots.txt Tester & Validator (Free Tool)

Robots.txt Tester

Use this robots.txt tester to fetch and parse a site's robots.txt, then test whether a given User-Agent and path are allowed. A robots validator helps you scrape within ethical and legal boundaries.

How to use

Enter the site URL (e.g. https://example.com). We fetch robots.txt.
Enter a User-Agent and a path (e.g. /products).
See Allow/Disallow result and any syntax issues.

Why test robots.txt?

Respect crawl directives before scraping.
Debug 403/block issues caused by disallowed paths.
Stay compliant with web scraping legal considerations and ethical web scraping.

How robots.txt affects scraping

Robots.txt tells crawlers which paths are allowed or disallowed for a given User-Agent. It is not legally binding in all jurisdictions, but following it is a core part of ethical web scraping. Ignoring it can lead to blocks, legal risk, or reputational harm. Use this tester to:

Before crawling — Check that the paths you need (e.g. /api/, /products/) are not disallowed for your User-Agent.
When debugging blocks — If you get 403 or redirects, verify that your path and User-Agent are allowed. Some sites disallow everything except certain bots; see Web Scraping Legal Considerations.
When choosing User-Agent — Test with the same User-Agent you use in production so the result matches reality.

Best practices

Identify your crawler in the User-Agent (e.g. MyBot/1.0) so site owners can contact you. See Ethical Web Scraping Best Practices 2025.
Respect Crawl-delay if present (though it is non-standard). Prefer rate limiting on your side; read Web Scraping at Scale: Best Practices.
Combine with Scraping Test to confirm the target URL is reachable with your proxy and headers.

Crawl-delay and non-standard directives

Some robots.txt files include Crawl-delay: N (seconds). This is not part of the standard and many crawlers ignore it, but ethically you may choose to throttle your requests anyway. Prefer controlling rate on your side (e.g. concurrency limits, delays between requests) so you can tune per site. Web Scraping at Scale: Best Practices and Ethical Web Scraping Best Practices 2025 discuss rate limiting and respect.

Sitemaps and robots.txt

Robots.txt can reference a Sitemap (e.g. Sitemap: https://example.com/sitemap.xml). Use that URL to discover pages for crawling; our tester focuses on Allow/Disallow, but when building a crawler, fetch and parse the sitemap when available. Web Scraping Workflow Explained outlines a full discovery and scrape workflow.

FAQ

The site has no robots.txt. Can I scrape? If no robots.txt is found, crawlers typically assume everything is allowed. You still must comply with the site’s terms of service and applicable law. Web Scraping Legal Considerations and Is Web Scraping Legal cover legality.

Disallow says / but I need one path. Can I still scrape that path? Strictly speaking, Disallow: / means no path is allowed for that User-Agent. Scraping disallowed paths may lead to blocks or legal risk. Prefer contacting the site or using an official API if available. Ethical Web Scraping Best Practices 2025.

Tips for using the tester

Use your real User-Agent — Test with the same User-Agent your crawler will use. Some sites allow only certain bots (e.g. Googlebot) and disallow others.
Test the exact paths you’ll scrape — If you plan to scrape /products/ and /api/, test both. A single Disallow: / means nothing is allowed; partial paths may be allowed or disallowed depending on rules.
Check for typos in robots.txt — The tester may report syntax issues. Fixing robots.txt is the site owner’s job, but knowing the rules are malformed helps you interpret “allowed” vs “disallowed” correctly.

Summary

This robots.txt tester fetches a site’s robots.txt and checks whether a given User-Agent and path are allowed. Use it before crawling to respect Allow/Disallow and to debug 403s. Respecting robots.txt is part of ethical web scraping and can reduce legal risk. When you scrape within the rules, our Residential Proxies help you collect data reliably.

More resources

Web Scraping Workflow Explained — from discovery to storage.
How to Build Your First Web Scraper — beginner guide.
Web Scraping vs Web Crawling — definitions.
Companies That Use Web Scraping — use cases.
Scraping Test — test if a URL is reachable with your setup.

Quick tips

If the site returns 404 for robots.txt, many crawlers treat that as “no restrictions.” You still must comply with the site’s terms and applicable law; see Web Scraping Legal Considerations.
When building a crawler, use the same User-Agent in the tester and in your scraper so the Allow/Disallow result matches reality. Identify your bot in the User-Agent string per Ethical Web Scraping Best Practices 2025.
After confirming paths are allowed, use Scraping Test and Residential Proxies to collect data without getting blocked.

Robots.txt and crawler identity

Use a descriptive User-Agent that identifies your crawler (e.g. MyCompanyBot/1.0 (+https://yoursite.com/bot)). That way site owners can see who is crawling and contact you if needed. It’s recommended in Ethical Web Scraping Best Practices 2025. Test that User-Agent in this tool so the Allow/Disallow result matches what your crawler will see. For reliable, respectful scraping, combine with Residential Proxies and Web Scraping at Scale: Best Practices.

Robots.txt Tester - Robots Validator & Checker

Key Takeaways