CipherBox - Cipher and Code Encoder Decoder

Tracking since May 24, 2026.

Changelog

• Jun 5, 2026
  description

  CipherBox is a fast, clean cipher encoder and decoder - nine classical code and cipher tools in one browser popup. No accounts, no tracking, no data ever leaves your browser.
  Ciphers included:
  
  • Caesar - encode and decode with full brute-force (all 25 shifts ranked by English frequency analysis)
  • ROT13 - the classic internet code
  • Vigenère - keyword-based cipher encoder and decoder
  • Atbash - ancient mirror substitution code
  • Rail Fence - Civil War era transposition cipher
  • Polybius Square - coordinate-based encoding, popular in puzzle caches
  • A1Z26 - letters to numbers decoder, used constantly in puzzles and escape rooms
  • Affine - mathematical cipher with 312-combination brute-force crack
  • Autokey - advanced Vigenère variant
  
  Each cipher includes:
  • Encrypt and decrypt
  • A step-by-step walkthrough showing exactly what happened to each letter
  • A plain-English explanation of the cipher's history and mechanics
  Perfect for:
  • Puzzle solvers and escape room enthusiasts
  • Geocachers - ROT13 is widely used in puzzle caches
  • Anyone interested in classical cryptography and secret codes
  • Anyone who wants to encode a message a friend can't immediately read
  
  No permissions required. No internet connection needed. Just ciphers.

  CipherBox is a cipher decoder and code encoder for nine classical ciphers, plus automatic cipher detection, all in one browser extension.
  No accounts, no tracking, no data ever leaves your browser.
  Paste any unknown ciphertext into the Decipher Unknown screen and CipherBox automatically tries 349 combinations across Caesar, ROT13, Atbash, Affine and Rail Fence, scoring each against English letter frequency patterns to rank the most likely answers. It also detects Base64, hex, binary, Polybius and A1Z26 by pattern matching. Click any result to jump to that cipher tab with the key pre-filled, ready to encode a reply.
  
  Ciphers included:
  Caesar with full brute-force, all 25 shifts ranked by frequency analysis
  ROT13
  Vigenère
  Atbash
  Rail Fence
  Polybius Square
  A1Z26
  Affine with brute-force crack across all 312 valid key combinations
  Autokey
  
  Each cipher includes:
  Encrypt and decrypt
  A step-by-step walkthrough showing exactly what happened to each letter
  A plain-English explanation of the cipher's history and mechanics
  
  Perfect for:
  Puzzle solvers and escape room enthusiasts
  Geocachers, where ROT13 is widely used in puzzle caches
  Anyone interested in classical cryptography and secret codes
  Anyone who wants to encode a message a friend cannot immediately read
  
  No permissions required. No internet connection needed. Just ciphers.
  
  v1.1 Decipher Unknown, automatic cipher detection across 349 combinations, pattern matching for Base64, hex, binary and number codes, code refactor and various UI improvements.
  V1.0: First release

• Jun 5, 2026
  short_description

  Nine classical cipher tools: Caesar, ROT13, Vigenere, Atbash, Rail Fence, Polybius, A1Z26, Affine, Autokey. Brute force included.

  Encode and decode secret messages using nine classical ciphers. Caesar, ROT13, Vigenere, Polybius, Affine and more.

• Jun 5, 2026
  name

  CipherBox

  CipherBox - Cipher and Code Encoder Decoder

• May 30, 2026
  description

  CipherBox gives you nine of history's most enduring ciphers in one fast, clean popup - no accounts, no tracking, no data ever leaves your browser.
  
  Ciphers included:
  • Caesar - with full brute-force (all 25 shifts ranked by English frequency analysis)
  • ROT13
  • Vigenère
  • Atbash
  • Rail Fence
  • Polybius Square
  • A1Z26
  • Affine - with one-click brute-force (all 312 key combinations ranked automatically)
  • Autokey
  
  Each cipher includes:
  • Encrypt and decrypt
  • A step-by-step walkthrough showing exactly what happened to each letter
  • A plain-English explanation of the cipher's history and mechanics
  
  Perfect for:
  • Puzzle solvers and escape room enthusiasts
  • Geocachers - ROT13 is widely used in puzzle caches
  • Anyone interested in classical cryptography
  • Anyone who wants to send a message a friend can't immediately read
  
  No permissions required. No internet connection needed. Just ciphers

  CipherBox is a fast, clean cipher encoder and decoder - nine classical code and cipher tools in one browser popup. No accounts, no tracking, no data ever leaves your browser.
  Ciphers included:
  
  • Caesar - encode and decode with full brute-force (all 25 shifts ranked by English frequency analysis)
  • ROT13 - the classic internet code
  • Vigenère - keyword-based cipher encoder and decoder
  • Atbash - ancient mirror substitution code
  • Rail Fence - Civil War era transposition cipher
  • Polybius Square - coordinate-based encoding, popular in puzzle caches
  • A1Z26 - letters to numbers decoder, used constantly in puzzles and escape rooms
  • Affine - mathematical cipher with 312-combination brute-force crack
  • Autokey - advanced Vigenère variant
  
  Each cipher includes:
  • Encrypt and decrypt
  • A step-by-step walkthrough showing exactly what happened to each letter
  • A plain-English explanation of the cipher's history and mechanics
  Perfect for:
  • Puzzle solvers and escape room enthusiasts
  • Geocachers - ROT13 is widely used in puzzle caches
  • Anyone interested in classical cryptography and secret codes
  • Anyone who wants to encode a message a friend can't immediately read
  
  No permissions required. No internet connection needed. Just ciphers.

Permissions & access

Permissions

None declared

Host access

None declared

Screenshots