〜 ★ dCode presents ★ 〜


Tool to decrypt/encrypt DTMF codes. DTMF codes are combinations of sound frequencies used in phones when dialing numbers.

DTMF Frequencies Decoder

DTMF Frequencies Encoder

See also: Morse Code

Answers to Questions

What are DTMF Codes? (Definition)

A DTMF code for dual-tone multi-frequency, is the name given to a combination of sound frequencies (beep) emitted by the keys of a telephone keypad. They are used by voice servers and for dialing numbers.

How to encrypt a number using DTMF Codes?

DTMF codes are used by phones and can be used to substitute numbers with their sound wave frequency as described in the table:

1209 Hz1336 Hz1477 Hz1633 Hz
697 Hz123A
770 Hz456B
852 Hz789C
941 Hz*0#D

Example: To crypt DC0D3, look for D which is the combination of 941Hz and 1633Hz, then write it 1633-941 (or 941-1633). The complete ciphered message is 1633-941/1633-852/1336-941/1633-941/1477-697

How to decrypt Codes DTMF cipher?

Decryption is a simple reverse substitution, for each frequency, a digit or a letter is associated.

How to recognize DTMF Codes?

There are only 8 frequencies: 697 Hz, 770 Hz, 852 Hz, 941 Hz, 1209 Hz, 1336 Hz, 1477 Hz and 1633 Hz.

What does DTMF means?

DTMF stands for dual-tone multi-frequency and translates sometimes into Vocal Frequencies.

Source code

dCode retains ownership of the source code of the script DTMF Code online. Except explicit open source licence (indicated Creative Commons / free), any algorithm, applet, snippet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in any informatic langauge (PHP, Java, C#, Python, Javascript, Matlab, etc.) which dCode owns rights will not be given for free. To download the online DTMF Code script for offline use on PC, iPhone or Android, ask for price quote on contact page !

Questions / Comments

Team dCode likes feedback and relevant comments; to get an answer give an email (not published). It is thanks to you that dCode has the best DTMF Code tool. Thank you.

Source : https://www.dcode.fr/dtmf-code