About the NATO Phonetic Alphabet Translator
This tool converts any text into the NATO phonetic alphabet — also called the ICAO spelling alphabet or the international radiotelephony spelling alphabet. It replaces each letter A-Z with its assigned code word (Alpha, Bravo, Charlie...) and each digit 0-9 with its assigned pronunciation, so the text can be spelled out loud without ambiguity over a radio, phone line, or noisy room.
The standard alphabet
The 26 code words are fixed by international agreement (ICAO Doc 9432, the Radiotelephony Manual) and have been in continuous use by aviation, military, maritime, and emergency services since 1956:
A Alpha · B Bravo · C Charlie · D Delta · E Echo · F Foxtrot · G Golf · H Hotel · I India · J Juliett · K Kilo · L Lima · M Mike · N November · O Oscar · P Papa · Q Quebec · R Romeo · S Sierra · T Tango · U Uniform · V Victor · W Whiskey · X X-ray · Y Yankee · Z Zulu
How the translation works
- The input text is split into words on whitespace.
- Each letter (case-insensitive) is replaced with its NATO code word.
- Each digit is replaced with its assigned word, using either the everyday pronunciation or the ICAO aviation pronunciation you select.
- Punctuation and other symbols have no official NATO code word, so they are left out of the spelling and counted separately as skipped characters.
- The resulting code words are joined either one source word per line, or on a single line with a slash between source words, depending on the layout you choose.
Digit pronunciation: standard vs. ICAO aviation
In everyday use, digits are simply read as Zero, One, Two, Three, Four, Five, Six, Seven, Eight, Nine. The ICAO Radiotelephony Manual (Doc 9432) changes several of these to prevent mishearing over noisy channels: 1 becomes "Wun," 2 becomes "Too," 3 becomes "Tree," 4 becomes "Fower," 5 becomes "Fife," 8 becomes "Ait," and 9 becomes "Niner" (partly to avoid "nine" sounding like "no" in some languages); 0, 6, and 7 keep their normal words. This translator supports both conventions.
Practical context
The NATO alphabet is designed for accuracy, not brevity — spelling "Cloud" as "Charlie Lima Oscar Uniform Delta" takes longer to say than the word itself, but each code word is chosen to be acoustically distinct from every other, which is what prevents letters like B, D, and V from being confused on a poor connection.