Is my data uploaded to a server?

No. robots.txt Tester runs 100% in your browser tab, so whatever you paste never leaves your device — safe for tokens, configs, and private payloads.

Does it work offline?

Yes. Once the page has loaded it keeps working with no network, because all processing happens locally.

Is there a size limit?

No hard limit. It handles as much as your browser can hold in memory, and it all runs on-device.

All dev tools

robots.txt Tester

robots.txt Tester that runs entirely in your browser — nothing you paste is uploaded.

InputLine 1: the path to test. The robots.txt body follows.

OutputValid

Path: /admin/settings
User-agent: *
Result: Blocked
Matched rule: Disallow: /admin

About this tool

Web and miscellaneous utilities cover the odd jobs of front-end and API work: checking WCAG color contrast, diffing two blocks of text, previewing Open Graph tags, turning a curl command into fetch(), or building a table from CSV.

How to use it

Paste your input
Drop your text, code, or data into the input box. robots.txt Tester runs on whatever you enter — no sign-up and no size limit beyond what your browser can hold.
Read the result instantly
The output updates as you type, computed on your device. A valid / invalid badge tells you at a glance whether the input parsed.
Copy it
Press Copy to put the result on your clipboard, ready to paste into your editor, terminal, or ticket.

Frequently asked

Is my data uploaded to a server?: No. robots.txt Tester runs 100% in your browser tab, so whatever you paste never leaves your device — safe for tokens, configs, and private payloads.
Does it work offline?: Yes. Once the page has loaded it keeps working with no network, because all processing happens locally.
Is there a size limit?: No hard limit. It handles as much as your browser can hold in memory, and it all runs on-device.

SERBABISA · CAN DO ANYTHING