Industry-standard symmetric encryption. Uses PBKDF2 key derivation with 100,000 iterations. The only truly secure option here — safe for sensitive data.

Not encryption — just encoding. Converts text to a safe ASCII format. Widely used in email, data URIs, and APIs. Anyone can decode it instantly.

Rotates each letter by 13 positions. Encrypt and decrypt are the same operation. Used for hiding spoilers, not for security.

Shifts each letter by a fixed amount (1–25). Used by Julius Caesar for military messages. Trivial to break by brute force (only 25 possibilities).

Reverses the alphabet: A↔Z, B↔Y, etc. Ancient Hebrew cipher. Encrypt and decrypt are the same operation. No security value.

Polyalphabetic substitution using a keyword. Much stronger than Caesar but broken by frequency analysis. Historical fun only — not for real security.

Converts text to dots and dashes. Developed in the 1830s for telegraph communication. Not encryption — purely encoding. Widely recognizable.

Converts each character to its 8-bit binary representation (0s and 1s). Not encryption — just a different way to represent text. Fully reversible.

Converts each character to its hex representation (base-16). Used in programming, color codes, and low-level data representation.

Encodes special characters for safe use in URLs (e.g. spaces become %20). Not encryption. Standard in web development for query strings and form data.