Ciphers & Encoders
76 free ciphers & encoders tools in the Text & Writing Tools collection — every one runs in your browser with no signup and no uploads.
ADFGVX Cipher
WWI German field cipher combining a Polybius substitution with a columnar transposition.
Affine Cipher Encrypt & Decrypt
Linear substitution cipher: E(x) = (ax + b) mod 26.
Arabic Morse Code Encoder
Encode Arabic letters to Arab ITU Morse sequences
ASCII Shift Cipher Encoder & Decoder
Shift every byte by N in the ASCII table (all 256 values)
Autokey Cipher Encoder & Decoder
Vigenère variant that appends the message to the key
Bacon's Cipher Encoder & Decoder
Steganographic 5-bit binary cipher using A/B substitution.
Beaufort Cipher Encoder & Decoder
Reciprocal variant of Vigenère — decrypt with the same key
Variant Beaufort Cipher
Beaufort variant where plaintext subtracts the key (plain minus key)
Bifid Cipher Encrypt & Decrypt
Combines a Polybius square with fractionation for diffusion.
Book Cipher
Encode each word as a line and word position reference into a shared text.
Braille Encoder/Decoder
Convert text to Unicode Braille cell characters and back
Chaocipher Simulator
Simulate Byrne's 1918 Chaocipher permutation algorithm
Dancing Men Cipher (Sherlock Holmes)
Conan Doyle's stick-figure cipher as Unicode approximation
Double ROT13 (ROT26)
Apply ROT13 twice — a no-op that demonstrates cipher identity
Four-Square Cipher Encrypt & Decrypt
Digraph cipher using four interlocking Polybius squares.
Greek Morse Code Encoder
Encode Greek letters to their ITU Morse sequences
Gronsfeld Cipher Encoder & Decoder
Vigenère variant with a numeric key (digits 0–9 only)
Hill Cipher
Polygraphic cipher that encrypts letter pairs with a 2×2 matrix multiplication mod 26.
Keyword Substitution Cipher
Build a 26-letter cipher alphabet from a keyword for substitution
Korean Morse Code Encoder
Encode Hangul jamo to Korean Morse dot-dash sequences
Morse Code Encoder/Decoder
Convert text to dots and dashes and back using International Morse
Morse Prosigns & Special Chars
Encode ITU prosigns (AR, SK, BT) and punctuation in Morse
NATO Alphabet Encoder (Word Input)
Encode whole sentences spelling each word in NATO phonetic
ITU-R Morse with Prosigns
Full ITU-R Morse including SOS, AR, SK prosigns and Q-codes
Number NATO Phonetic Speller
Spell phone numbers as Niner-Two-Tree for radio clarity
NATO Phonetic Alphabet Converter
Spell out words as Alpha Bravo Charlie Delta and back
Nihilist Cipher Encoder & Decoder
Russian nihilist's Polybius-based additive numerical cipher
Phonetic Alphabet Word Generator
Build a custom spelling alphabet for any word or theme.
Phonetic Spelling Generator
Respell words showing approximate English pronunciation
Pig Latin Transformer
Onvert-cay ext-tay oo-tay ig-Pay atin-Lay
Pigpen Cipher
Masonic geometric cipher — replace each letter with its grid-cell shape.
Playfair Cipher Encrypt & Decrypt
Digraph substitution using a 5×5 keyword-keyed square.
3D Polybius Cube Cipher
Extend Polybius to a 3×3×3 cube for 27-character sets
Polybius Square Cipher Encoder
Encode each letter as a row and column coordinate pair.
Porta Cipher
Giovanbattista della Porta's 6-alphabet reciprocal cipher
NATO Phonetic Alphabet Converter
Spell anything using the NATO phonetic alphabet
Pig Latin Generator
Translate any English text into Pig Latin
Event Coordinator Resume Builder
Highlight event scale, vendor management, and execution metrics
Logistics Coordinator Resume Builder
Document freight management, carrier relations, and cost savings
Rosicrucian / Templar Cipher
Secret society pigpen variant with dot-position encoding
ROT-N Cipher (Custom Rotation)
Choose any rotation N from 1 to 25 to shift letters
ROT13 Encoder & Decoder
Self-inverse letter rotation by 13 — the classic spoiler tool
ROT47 Encoder & Decoder
Rotates all 94 printable ASCII characters by 47 positions
Running Key Cipher Encoder & Decoder
Use a long key text (book passage) for each letter's shift
Russian / Cyrillic Morse Encoder
Encode Cyrillic letters to Russian Morse code sequences
Scytale Cipher
Ancient Greek transposition cipher — wrap text around a rod of a chosen diameter.
Discord ROT13 Spoiler Helper
ROT13 your text and wrap it in Discord spoiler tags
Straddle Transposition Cipher
Write text into irregular grid then read columns in key order
Straddling Checkerboard Cipher
WWII spy cipher: fractionating substitution with short codes
Knights Templar Cipher (Maltese Cross)
Encode letters in the Templar cross cell-based cipher
Tengwar-Style Phonetic Mapper
Map English phonemes to Tolkien-inspired Tengwar using CSUR Unicode Private Use Area code points.
Braille Dot Bitmap Renderer
Render text as a grid of Unicode Braille dot characters
Morse Code Audio Player
Generate and play Morse code audio beeps in the browser
Trifid Cipher Encrypt & Decrypt
A 3D extension of Bifid using a 3×3×3 cube of 27 symbols.
VIC Cipher (Soviet Spy) Simulator
Cold War Soviet agent cipher — straddling checkerboard + transposition
Extended Vigenère (Full ASCII)
Vigenère over 95 printable ASCII chars instead of just 26 letters
Wabun Code (Japanese Morse) Encoder
Encode katakana to Japanese Wabun Morse code sequences
XOR Cipher
XOR each byte of text with a repeating key — the symmetric building block of crypto.
ROT13 Converter
Encode and decode ROT13 — the letter-rotating cipher.
Caesar Cipher
Encrypt and decrypt text with a shifting Caesar cipher.
Text to Binary Converter
Convert text into UTF-8 binary, 8 bits per byte.
Binary to Text Converter
Decode binary back into readable UTF-8 text.
Pig Latin Translator
Turn English into Pig Latin instantly, in your browser.
Binary to Emoji Converter
Encode text as playful emoji binary and decode it back.
Phonetic Spelling Generator
Spell names and codes out loud with NATO or police alphabets.
Vigenère Cipher Encoder & Decoder
Encrypt and decrypt text with a keyword-based Vigenère cipher.
Atbash Cipher Encoder & Decoder
Mirror the alphabet — A becomes Z, B becomes Y, all in your browser.
Rail Fence Cipher Encoder & Decoder
Zig-zag transposition cipher with a choice of rails.
Substitution Cipher Encoder & Decoder
Keyword-seeded monoalphabetic substitution, all in your browser.
A1Z26 Cipher Encoder & Decoder
Convert letters to their alphabet position — A=1, Z=26.
ROT13 Encoder & Decoder
Encode or decode ROT13, ROT13+ROT5 and ROT47 instantly — copy in one click.
Binary Text Translator
Convert text to binary and back — plus decimal and hex of every code point.
Caesar Cipher Tool
Encrypt, decrypt and crack Caesar ciphers with any shift.
NATO Phonetic Alphabet Translator
Spell anything out in Alfa, Bravo, Charlie — and decode it back.
Braille Translator
Convert text to Grade-1 Unicode braille and back, in your browser.
Morse Code Translator
Convert text to Morse and decode Morse back to text, with audio playback and a reference chart.