DTMF Tone Generator – Online Telephone Keypad Dial Tones
Touch-tone keypadReady
- Start quiet, raise slowly
- Check L/R markings first
- Disable audio enhancements
- Runs inside your browser
- No upload, no account
- Nothing saved after you close
Dual-tone multi-frequency (DTMF) keypad
Every phone key plays two tones at once, one from a low group and one from a high group. Press keys or type a number to dial it.
What is DTMF?
Dual-tone multi-frequency signalling replaced rotary pulses in the 1960s.
DTMF frequency table
1209133614771633697123A770456B852789C941*0#D.
The A, B, C and D keys
The fourth column was used by military and priority telephone networks and is still used by some radio and control systems.
How to Use the
DTMF Tone Generator
- 01
Volume
set a moderate level.
- 02
Keys
press any key to hear its two tones.
- 03
Dial
type a number and press Dial to play the full sequence.
- 04
Test
hold the phone mic near the speaker to test IVR menus or decoders.
What is DTMF?
Dual-tone multi-frequency signalling replaced rotary pulses in the 1960s. Each key mixes a row tone (697–941 Hz) with a column tone (1209–1633 Hz), a pair that speech rarely produces.
DTMF frequency table
| 1209 | 1336 | 1477 | 1633 | |
|---|---|---|---|---|
| 697 | 1 | 2 | 3 | A |
| 770 | 4 | 5 | 6 | B |
| 852 | 7 | 8 | 9 | C |
| 941 | * | 0 | # | D |
The A, B, C and D keys
The fourth column was used by military and priority telephone networks and is still used by some radio and control systems.
Uses today
Phone menus, voicemail, door entry systems and radio repeaters still recognise DTMF.
DTMF tips
Playing a sequence
Type digits, then Dial; each key plays 200 ms with a gap.
Common uses
Navigating phone menus, testing decoders and radio control.
IVR is not recognising tones
Hold the phone close to the speaker, raise volume moderately and avoid speakerphone noise suppression.
Tones sound similar
They are close in pitch; systems decode the pair, not the melody.
Tones sound distorted
Lower the volume to avoid clipping in the speaker.
Are the tones standard?
Frequencies follow the ITU-T Q.23 table.
IVR help
IVR not recognising tones
Use handset mode close to the speaker and avoid noise suppression.
Related guides and fixes
Learn more in these guides: No sound on Windows, No sound on Mac, Headphones only one side, Speakers crackling, How to test speakers, How to test headphones.
Frequently Asked Questions
Q.Why two tones?
To make keys hard to trigger by accident with speech.
Q.How long should a tone last?
At least 40 ms with a similar gap; we use 200 ms.
Q.Can I download the tones?
Use the voice recorder or the test-file generator for files.