Classical ciphers, Base64, JWT, Hex, URL Encode and other tools for developers, learning and data analysis.
Navigation hubs grouped by purpose. Each category bundles related tools, explanatory blocks and use cases.
Explore historical encryption methods including Caesar, Vigenere, Playfair, Beaufort, Vernam, Bacon, Atbash, A1Z26, and other classical ciphers. Encrypt, decrypt, and learn how traditional cryptography works online.
Open categoryTools for encoding, decoding, and converting text and binary data. Use Base64, Hex, URL Encode, Binary, ASCII, Unicode, JWT, and other formats online.
Open categoryMD5, SHA256, HMAC, checksums and cryptographic hash functions.
Frequency analysis, entropy, index of coincidence and other tools for analyzing ciphers.
Most-used tools from the catalog — start here.
Encode text and binary payloads to Base64 and decode them back with UTF-8 support.
Decode JWT tokens in-browser and inspect header, payload, claims, and expiration data.
Classic letter-shift cipher with custom shift values.
Encode and decode URL strings and query params for safe transport in HTTP and APIs.
Convert text and bytes to hexadecimal format and decode hex sequences back to text.
Convert text into 8-bit binary groups and decode binary bytes back into readable text.
Common tasks and the tools that solve them.
A quick orientation in three compact blocks.
Encoding transforms data into a different representation without a key. Encryption protects data with a key and is reversible only by who holds it.
Substitution and transposition schemes from before the digital era — Caesar, Vigenère, Playfair and more. Useful for learning and CTF challenges.
Binary data inside text protocols (HTTP, JSON, email), inspecting bytes while debugging and stable representation of arbitrary content.
Recently added tools in the catalog.
Convert text to Unicode escapes and decode Unicode escapes, HTML entities, and multilingual text.
Convert ASCII characters and numeric codes for protocol and parser workflows.
Decode JWT tokens in-browser and inspect header, payload, claims, and expiration data.