Argon2 Hash Generator — Free Online Argon2id Password Hashing

Argon2 won the Password Hashing Competition in 2015 and is now the OWASP-recommended algorithm for password storage. It was designed specifically to resist GPU-based cracking attacks by requiring significant memory bandwidth — a resource that doesn't scale on graphics cards the way raw computation does.

Argon2 has three tunable parameters: memory cost (in kilobytes), time cost (iterations), and parallelism. This flexibility lets you tune the algorithm to your hardware — the goal is to make each hash computation take 100–500ms on your server, which makes brute-force attacks expensive without significantly impacting legitimate logins.

Argon2id is the recommended variant for most applications — it combines Argon2i's resistance to side-channel attacks in the first pass with Argon2d's resistance to time-memory trade-off attacks in the second pass. OWASP minimum configuration: memory=19MB, iterations=2, parallelism=1.