Build and test a robots.txt
One click blocks the AI crawlers (GPTBot, ClaudeBot, Google-Extended, CCBot and the rest). They are kept separate from the search crawlers, because blocking the wrong one removes you from Google.
- Runs entirely in your browser
- Works offline
- No upload
- No sign-up
- No watermark
Loading the tool…
How it works
- List the parts of the site to block (paths), and any exceptions to allow.
- Optionally block the AI crawlers.
- Test a URL against the result. The tester uses the same “longest rule wins” logic search engines apply.
Why nothing is uploaded
Every operation on this page is done by code running inside your browser tab, using the same engine that renders web pages. The file is read from disk into your tab’s memory, transformed there, and written back out as a download. It is never sent anywhere — not to us, not to a third party.
Verify it yourself
- Open your browser’s developer tools (F12) and select the Network tab.
- Load your file and run the tool.
- The only requests you will see fetch the tool’s own code — and, for a few heavy tools, their open-source engine from a public CDN — plus one small page-view ping to loreatec.jp (page address and title, nothing more). None of them carry your file.
Frequently asked questions
Does blocking Google-Extended hurt my search ranking?
No. Google-Extended only controls whether your pages are used to train Google’s AI models (Gemini); it has no effect on Google Search. Googlebot is the one that matters for search, and blocking that removes you from results entirely.
Does robots.txt keep a page out of Google?
No — this is a common and costly misunderstanding. A Disallow line stops Google from reading the page, not from listing it: a blocked page can still appear in results, without a description, if other sites link to it. To keep a page out of Google, let it be crawled and add a noindex meta tag instead.
Does anything leave my browser?
No. Nothing is sent to a server. The whole tool is a small program that runs inside your browser tab. Once the page has loaded, it keeps working even with the internet switched off.