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Hashcat / John Rule & Mask Builder
Compose Hashcat mask strings and rule lines, or John the Ripper rules — with live sample-word preview and keyspace estimates. Builder only, no cracking.
⚠️For authorized password assessments only. This tool composes syntax; it does not accept hashes, wordlists, or crack passwords.
🔒 100% client-side.
Pick a mask using Hashcat charset placeholders (?l ?u ?d ?s ?a ?h ?H ?b) and optional custom charsets ?1..?4.