Encoding & Crypto for Student

11 encoding & crypto tools hand-picked for Student.

Affine Cipher Encoder & Decoder

Encrypt and decrypt the ax+b affine cipher with live modular-inverse check, browser-only
Atbash Cipher

Mirror the alphabet, A↔Z B↔Y, no key, self-reciprocal so the same button encodes and decodes, browser-only
Bacon Cipher Encoder & Decoder

Turn text into five-letter A/B groups, or read a Baconian message back — 24 and 26 letter alphabets, custom symbols, browser only
Caesar Cipher Encoder & Decoder

Encrypt, decrypt and brute-force a Caesar shift cipher — all 25 shifts at once, ROT13 shortcut, browser-only
Password Strength Checker

Check password strength — entropy, time-to-crack, breach pattern check (offline).
Polybius Square Cipher Encoder & Decoder

Turn letters into 5x5 grid coordinates and back, with a keyword square, origin switch and a live grid, browser-only
Rail Fence Cipher Encoder & Decoder

Encrypt, decrypt and brute-force a rail fence zigzag cipher, with a live grid, rail count plus offset, browser-only
ROT13 Encoder & Decoder

ROT13 / ROT47 / Caesar cipher — encode and decode in your browser, instant.
ROT47 Encoder & Decoder

Rotate all visible ASCII by 47. Digits and symbols change too, fully self-inverse, runs in your browser.
Text to Binary Converter

Text to binary (and back) — UTF-8 aware, 8/16/32 bit grouping, emoji safe.
Vigenère Cipher Encoder / Decoder

Encrypt and decrypt with a keyword, polyalphabetic shift, case kept, non-letters passed through, browser-only