About SolveCipher
SolveCipher is a free collection of online cipher and code tools that lets anyone encode, decode, and solve secret messages instantly — no signup, no downloads, no cost. Whether you're cracking an escape room puzzle, decoding a Morse code message, learning about cryptographic history, or competing in a CTF challenge, every tool works right in your browser.
Why We Built This
The cipher tool space is full of outdated, slow, and hard-to-use sites. Most were built in the early 2000s and haven't meaningfully improved since. We built SolveCipher to be the tool we wished existed: fast, mobile-friendly, accurate, and educational — not just a black box that spits out answers, but a resource that helps you understand how each cipher actually works.
Cryptography is one of the oldest and most fascinating fields in human history. We think everyone deserves easy access to it.
What SolveCipher Does
- 15+ interactive cipher tools— Caesar cipher, Vigenère, Atbash, ROT13, substitution cipher, Rail Fence, Playfair, Pigpen, Bacon's cipher, A1Z26, and more. All run entirely in your browser with instant results.
- Encoding systems — Morse code, binary, hexadecimal, Base64, Braille, and NATO phonetic alphabet tools with both encoder and decoder modes.
- Translation pages — Thousands of programmatic pages for specific translations: hello in Morse code, hello in binary, hello in Braille, and thousands more.
- Cipher Identifier — Paste unknown ciphertext and get ranked guesses with confidence scores for what type of cipher was used.
- Automatic cryptogram solver — Our substitution cipher solver uses hill-climbing and statistical English analysis to crack cryptograms automatically.
- Educational content — Detailed explanations of how each cipher works, its history, and how to break it.
How It Works
Every cipher on SolveCipher is implemented as a pure TypeScript function that runs entirely in your browser. When you encode or decode a message, no text is ever sent to our servers — the computation happens locally on your device. This means results are instant, the tools work offline, and your messages stay private.
For the substitution cipher auto-solver, we use a hill-climbing algorithm with English bigram frequency scoring — the same statistical approach professional cryptanalysts use. It runs in a Web Worker to keep the interface responsive during longer solving sessions.
Who Uses SolveCipher
- Escape room enthusiasts — decoding cipher locks and puzzle boxes on the fly
- Geocachers — solving mystery cache coordinates hidden behind cipher puzzles
- CTF competitors — quickly identifying and cracking cipher challenges
- Students and teachers — learning cryptography concepts with hands-on tools
- Puzzle and ARG designers — encoding messages for their own cipher puzzles
- History buffs — exploring how ciphers shaped wars, diplomacy, and espionage
- Gravity Falls fans — decoding the show's hidden Caesar, Atbash, and Vigenère messages
Our Blog
Beyond the tools, we publish in-depth articles on cryptography history, cipher mechanics, and puzzle-solving strategy. From the history of cryptography to how to crack every escape room cipher, our goal is to make this fascinating field accessible to everyone.
Free and Ad-Supported
SolveCipher is completely free to use. We keep the site running through Google AdSense advertisements, which appear in clearly labeled spaces. We keep ads minimal — never blocking the tool output, never intrusive — because a fast, useful tool matters more than maximizing ad impressions.
Our Tools Network
SolveCipher is part of a network of free utility sites. Our sister site, SyllableCounting.com, provides instant syllable counts for any English word or sentence.
Contact Us
Found a cipher we're computing wrong? Have a feature request? We read every message and take accuracy seriously.
Send us a message → or email hello@solvecipher.com