Two things a system administrator ends up doing constantly: creating a credential that will not be guessed, and proving a file is the file it claims to be. Neither deserves a desktop install or an account somewhere.
Both tools below run entirely in your browser. Nothing you type is sent to a server, which is the only acceptable arrangement for a password you are about to use and for a file you may not be allowed to upload anywhere.
Tools in this category
- Secure Password Generator — generate passwords and passphrases with control over length, character sets and ambiguous characters, with an entropy estimate for each result.
- Hash generator — compute MD5, SHA-1, SHA-256 and SHA-512 for text, and compare a result against a published checksum.
Where these get used
The hash generator earns its place after a download. A vendor publishes a SHA-256 next to an ISO or an installer; you compute the hash of what actually landed on disk and compare. A mismatch means a corrupted transfer far more often than it means tampering, but either way you find out before you deploy it to fifty machines.
The password generator matters most for accounts nobody will type by hand: service accounts, local administrator passwords, API keys, a break-glass credential going straight into a vault. Length beats complexity rules there, and the entropy figure is the honest measure of how long a password would hold up.
Email authentication checks
Two more checks are security work even though they live with the DNS tools, because a domain that anyone can spoof is a security problem, not a naming one:
- SPF record validator — confirm which hosts may send as your domain, and catch the ten-lookup limit that silently breaks SPF.
- DMARC record validator — read the published policy and see whether a failing message is monitored, quarantined or rejected.
Related guides
- How to Generate SSL Certificates with OpenSSL — keys, CSRs and self-signed certificates from the command line.
- Discovering Certificate Authorities (CAs) in Your Domain — finding out what is actually issuing certificates inside an Active Directory forest.
- ICACLS command in Windows — reading, changing and restoring NTFS permissions without breaking inheritance.
- RDP security warning after April 2026 Windows update — what the warning means and how to respond to it properly.
Other tool categories
- DNS tools — record lookups, propagation, SPF and DMARC.
- Network tools — subnet maths, port checks and connectivity diagnostics.
- System tools — Windows command builders and log analysis.
- Data utilities — JSON, JWT, timestamps and cURL conversion.
- Encoding tools — Base64 and URL encoding.
- PowerShell and PowerCLI tools — vSphere command building and PowerShell guides.