Free Ciphers & Codes
Secret codes, done properly: a historically faithful Enigma machine simulator (rotors, plugboard, ring settings), pigpen, rail fence, and Bacon ciphers, a frequency analysis lab for cracking them, an Elder Futhark rune translator, braille, barcodes, and anagram and acronym solvers.
Enigma Machine
Encrypt like 1940 — real rotors, plugboard, and ring settings.
Open tool → LivePigpen Cipher
Draw secret messages in Masonic symbols, decode them back.
Open tool → LiveRail Fence Cipher
Zigzag transposition cipher with a live pattern view.
Open tool → LiveBacon Cipher
Hide messages in plain sight with Bacon’s A/B biliteral cipher.
Open tool → LiveFrequency Analysis Lab
Crack ciphers with letter frequencies and the index of coincidence.
Open tool → LiveElder Futhark Translator
Latin to ancient runes and back.
Open tool → LiveBraille Translator
Text to Unicode braille patterns and back.
Open tool → LiveBarcode Generator
Scannable Code 128 and EAN-13 barcodes, download as PNG or SVG.
Open tool → LiveBase32 Encoder
RFC 4648 base32 encode and decode.
Open tool → LiveAnagram Solver
Find every anagram hiding in your letters.
Open tool → LiveAcronym Generator
Turn phrases into acronyms — and acronyms into phrases.
Open tool →Related categories
More from the codex
Browse all categories
Every category on the codex, from study tools to ciphers — pick your starting point.
Browse → LivePrompt Simulator
Practice prompt engineering: write prompts, get scored 0–10.
Open tool → LiveGPA Calculator
Semester and cumulative GPA with weighted scales and a target planner.
Open tool →About these ciphers & codes
Every tool below is free, works in your browser, and needs no account.
- Is the Enigma simulator accurate?
- Yes — it implements rotors I–V, reflectors B/C, ring settings, and the plugboard, verified against known test vectors. What you encrypt, you can decrypt.
- What's the frequency analysis lab for?
- It counts letter frequencies in any text and compares them against English norms, with the index of coincidence — the classic first step in breaking a substitution cipher.
- Are these just toys?
- They're real implementations with round-trip guarantees, and each page explains the history and the math behind its cipher.
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