Drop a firewall config below. Passwords, PSKs, shared secrets, SNMP communities, private keys and certificate bundles are replaced with placeholders on this device. You see exactly what changed, and only the sanitized text ever leaves your machine.
The file is read locally with the browser's FileReader. No config data is sent to any server by this page.
Open your browser's developer tools (F12) → Network tab, then drop a file. You will see no upload request carrying the config. This page also makes no calls to any external host except loading its own fonts. The redaction code is readable via View Source, and you can download the redacted copy below to inspect exactly what would be sent.