Word-Based Code Decoder DECODING

Decode three types of word-based codes to numbers: NATO Phonetic Alphabet (Alpha=1..Zulu=26), Roman Numerals (I=1..MMM=3000+), and English Number Words (“one hundred twenty-three” → 123). Select a tab below to get started. All processing is local — no data is uploaded.
Encoding: Auto-detect ▾
Input (NATO code words or numbers)
Direction: Auto-detect
Type to convert in real-time
Output
(UTF-8 .txt)
Input (Roman numerals or Arabic numbers)
Direction: Auto-detect
Type to convert in real-time
Output
(UTF-8 .txt)
Input (English number words)
Type to convert in real-time
Output (digits)
(UTF-8 .txt)
NATO Phonetic Alphabet Reference (with pronunciation)
1AlphaAL-fah14Novemberno-VEM-ber
2BravoBRAH-voh15OscarOSS-car
3CharlieCHAR-lee16Papapah-PAH
4DeltaDELL-tah17Quebeckeh-BECK
5EchoECK-oh18RomeoROW-me-oh
6FoxtrotFOKS-trot19Sierrasee-AIR-rah
7GolfGOLF20TangoTANG-go
8Hotelhoh-TEL21UniformYOU-nee-form
9IndiaIN-dee-ah22VictorVIK-tah
10JuliettJEW-lee-ETT23WhiskeyWISS-key
11KiloKEY-loh24X-rayECKS-ray
12LimaLEE-mah25YankeeYANG-key
13MikeMIKE26ZuluZOO-loo
Roman Numerals Quick Reference
I1VIII8LX60
II2IX9XC90
III3X10C100
IV4XX20D500
V5XXX30M1000
VI6XL40MM2000
VII7L50MMM3000
Rules: I before V/X = subtract (IV=4, IX=9) • X before L/C = subtract (XL=40, XC=90) • C before D/M = subtract (CD=400, CM=900) • Max 3 repeats in a row (III=3 but 4=IV). Supports values 1–3999.
Supported Number Words
Units: zero, one, two, three, four, five, six, seven, eight, nine
Teens: ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen
Tens: twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety
Scales: hundred, thousand, million, billion, trillion, quadrillion, quintillion, sextillion, septillion, octillion, nonillion
Specials: and (optional), negative, minus, point (decimal), hundred (with preceding number: "one hundred")
Word-based codes — what and why

These three systems all spell numbers out in words. The NATO phonetic alphabet (Alpha, Bravo, Charlie…) gives every letter a distinct spoken code word so letters survive bad radio channels; here Alpha=1 … Zulu=26 turns it into a letter-number cipher. Roman numerals (I, IV, XL, M) write values with additive and subtractive letter pairs; English number words spell the value out in full.

Roman numerals add left-to-right, except that a smaller letter before a larger one subtracts — IV is 5−1=4, IX is 10−1=9 — and a letter may repeat at most three times in a row (III is valid, IIII is not).