Cipher Tools - Encrypt & Decrypt

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Polybius Square Cipher Tool – Online Encode & Decode

Encrypt or decrypt text using the classical 5x5 Polybius square. Excludes J or merges I/J.

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SSL Cipher Suite Checker - Online Test TLS Security

Check which cipher suites a website supports and identify weak or outdated ones. Quick security audit from your browser.

Network checker cipher SSL TLS

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Letter Frequency Analyzer - Online ETAOIN SHRDLU

Paste text to see a live letter frequency bar chart. Helps break substitution ciphers. All local analysis.

Educational analysis cipher frequency letters

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Emoji Cipher Decoder - Online Secret Message Fun

Decode a message hidden in a string of emojis (each emoji maps to a letter). Fun game for kids. Create your own.

Educational cipher decoder emoji secret

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Text to Emoji Cipher - Online Encode Secret Messages

Convert your text into a string of emojis using a simple substitution cipher. Share secret messages that look fun. Decode them with the same tool. All local.

Encoder/Decoder cipher emoji encode secret

ROT13 Encoder & Decoder - Online Caesar Cipher ROT13

Easily apply ROT13 cipher to obfuscate or reveal text. A classic letter substitution cipher that works bidirectionally. Purely client-side processing.

Encoder/Decoder cipher decoder encoder ROT13

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Pigpen Cipher Encoder - Online Masonic Symbol Translator

Encrypt text into the classic pigpen symbols and decode them back. Fun for treasure hunts and mystery games.

Encoder/Decoder cipher decoder encoder pigpen