CrawlerControl
robots.txt · crawler simulator

CrawlerControl

Check which URLs each bot can crawl, find out the exact rule that decides access, and download a corrected robots.txt before publishing.

Test robots.txt rules for Googlebot, GPTBot and other agents. See which rule allows or blocks a path, then download the text with comments and Sitemap preserved.

Try the toolUse cases
No accountLocal processingVisible assumptions

01 · Your inputs

Paste your robots.txt and try a route

Separates user-agent groups and Allow/Disallow rules.

The file is read locally.
Don't paste secrets; robots.txt is public.
No network request is made.
The record is deliberately short and versioned.

02 · Result

Access, winning rule and conflicts

Calculation ready

Access blocked

The most specific rule is disallow: /training/.

DISALLOWDecision
3Rule groups
1Matching rules
Tested User-agent
Google-Extended
Path
/training/private/report.html
Decisive rule
disallow:/training/
Conflicts
0
  • robots.txt targets cooperative crawlers; It does not authenticate, does not protect content and does not guarantee deindexing.

Method

How it works

  1. Separates user-agent groups and Allow/Disallow rules.
  2. Select the most specific group and apply the longest path match.
  3. Shows the applied rule and warnings. The download preserves the entered text, including comments, Sitemap and line endings.
Understand before deciding →

When to use it

Use cases

  • Audit changes before publishing robots.txt.
  • Explain why a route is allowed or blocked.
  • Detect out-of-group rules and basic contradictions.
Practical example →

Limits

Sources and scope

robots.txt is not authentication, security, or a deindexing command. The simulator implements a practical subset of RFC 9309 and does not query remote URLs.

RFC 9309
Privacy by design

Your data stays on this device

The tool calculates and creates files in your browser. It needs no account and does not send your input to Chapa Lab.

Privacy →