Security guides
5 practical guides on security topics. Each one ends with a free tool that runs entirely in your browser.
- How Strong Should a Password Be? Length vs. Complexity
Length beats cleverness. Learn what actually makes a password hard to crack, why random passphrases work, how much entropy is enough, and a simple rule to follow.
3 min read · Password Strength Checker
- MD5 vs SHA-256: Which Hash Should You Use?
Hashes fingerprint data, but not all are safe. Learn when MD5 is fine, when it is dangerous, why SHA-256 is the default, and why passwords need bcrypt or Argon2 instead.
3 min read · Hash Generator
- How to Verify a File Checksum (SHA-256) on Windows, macOS, and Linux
Check that a download is complete and untampered by comparing its SHA-256 hash, with commands for every operating system and what a mismatch means.
2 min read · Checksum Verifier
- bcrypt vs Argon2: How to Hash Passwords Properly
Why passwords need slow, salted hashes, how bcrypt and Argon2id differ, sensible parameters, and how to migrate an existing user database.
2 min read · Bcrypt Hash Generator/Checker
- How to Generate a Secure API Key or Secret (Length, Encoding, and Storage)
How much randomness an API key needs, why to use a cryptographic random generator, how to encode and prefix keys, and how to store and rotate them safely.
2 min read · Secret/API Key Generator