Codes — Online tools

Convert letters and numbers with A1Z26, A0Z25, and two reversed variants.

Reveal a hidden message in the lines or words of a text.

Analyze, normalize and share a GPS coordinate.

Quickly test a substitution alphabet on a text.

Convert text to decimal or hexadecimal ASCII, and back again.

Encode or decode text with the reversed alphabet.

Automatically test the 25 possible Caesar shifts.

Encode or decode a message with five-character A/B groups.

Convert text to sequences of 0s and 1s, and back again.

Convert text to Unicode braille, or read braille back into text.

Encode or decode a message with an exact alphabet shift.

Extract, remove, replace, or count character families.

Analyze an unknown message and spot possible codes.

Create an encoded message with its explained solution.

Transpose text with an oriented grid.

Convert a GPS coordinate between decimal, DM and DMS.

Automatically read the diagonals of text placed in a grid.

Extract a hidden message from the differences between two texts.

Analyze letter frequencies and test a substitution table letter by letter.

Detect GPS coordinates found in text.

Encode a message in a reading grid.

Convert a message to grid coordinates, or coordinates back to a message.

Turn source text into a grid and test several reading paths.

Try several grid widths to reveal hidden readings.

Convert text to UTF-8 hexadecimal, or read a sequence of bytes.

Test a repeated alphabet shift with A=0, A=1, or a number sequence.

Calculate gaps between alphabet letters.

Count repeated, unique, and absent letters.

Extract hidden letters by positions, patterns, masks, or common attempts.

Count each letter occurrence and percentage in a text.

Find the exact positions of each letter in a text.

Calculate the value of a word or text with A=0 and A=1 mappings.

Reverse words, lines, or their order instantly.

Find the letters absent from a text.

Encode or decode Morse with dots, dashes, or detected symbols.

Test several simple decodings on the same message.

Convert text into Alfa, Bravo, Charlie radio words.

Retrieve a specific letter from each word.

Extract all numbers found in text.

Encode a message with a 5×5 grid and coordinates.

Create a blank square-cell grid and print it on A4.

Place text into a square-cell grid and print it on A4.

Prepare text before decoding by adjusting case, accents, spaces, and kept characters.

Encode text using a zigzag pattern.

Create a substitution alphabet to encode or decode a message.

Convert a number to Roman numerals, or the other way around.

Try ROT5, ROT13, ROT18 and ROT47 in one tool.

Encode or decode text with the fixed 13-letter alphabet shift.

Apply ROT13 to letters and ROT5 to digits.

Encode or decode printable ASCII characters with ROT47.

Encode or decode digits with a rotation of 5.

Encode text by transposition with a chosen width.

Extract letters using a sequence of positions.

Shuffle the letters of a word or phrase in seconds.

Build a substitution alphabet with letter tiles.

Generate a simple grid with hidden words.

Place text into a spiral grid.

Turn a message into taps or dots.

Compare two texts and instantly spot matching or different passages.

Extract letters by step or positions.

Encode or decode a message with a Vigenère key.

Shuffle the words of each sentence in seconds.