Test a Path Against Pasted Disallow Prefixes

How to Use This Tool

Run a transparent prefix check locally without fetching the live robots file. The tool accepts pasted text, performs one narrow transformation, and shows the result immediately. It does not fetch a URL, open an account or send the input to a processing API.

The failure this tool prevents

This quick checker handles simple prefix rules only; user-agent grouping, wildcards and precedence require a full standards-aware crawler test. That distinction matters because quick search-and-replace recipes often work on a toy sample and corrupt the first real export containing quotes, nested structures, empty values or repeated configuration.

Safe workflow

Keep the original file unchanged. Paste a small sample containing a header, a normal record, a blank or missing value, and any delimiter or nesting edge case you expect. Compare the output with the source before using the full dataset. A browser tool makes transformation fast; it does not know the downstream system's schema or business rules.

Privacy and limits

The operation runs in the current page and no model or server endpoint is called. Avoid pasting secrets into any webpage unless you trust the page and device. Large inputs still consume local memory, and closing or refreshing the tab discards the result. This focused parser is for preparation and diagnosis, not a substitute for a standards-complete production pipeline.