Play the tones a phone keypad makes, or type a digit sequence and download it as a WAV file. Each key is shown with its two frequencies. Use it to test an IVR menu, check a DTMF decoder or add keypress tones to a recording. Everything runs in your browser.
On-screen keypad: tones play for as long as you hold a key
Keyboard support: press 0-9, *, # (and A-D when shown)
Low and high frequency shown on every key
Optional A, B, C and D column for test equipment
Sequence player with tone length, gap and comma pause settings
Download the sequence as a 16-bit mono WAV at 8000 Hz (telephone) or 44100 Hz
Free, no signup, nothing uploaded
Play a menu path such as 1,,3,,2 into a test call or a recording to check each option routes where it should.
Generate a known sequence as a WAV and feed it to your decoder or speech platform to confirm every key is detected.
Press a key to hear its tone and read the exact low and high frequency pair shown on it, then compare keys in the same row or column to see which frequency they share.
DTMF (dual-tone multi-frequency) is the signal a phone sends when you press a key. Each key plays two sine tones at once: one from a low group (697, 770, 852 or 941 Hz) for its row and one from a high group (1209, 1336, 1477 or 1633 Hz) for its column. The grid is defined in ITU-T Q.23. The 1633 Hz column carries the A, B, C and D keys, which normal phones leave out but some test and radio equipment uses.
For a longer explanation, read What is DTMF? An IVR keypress guide.
An IVR listens for the two frequencies together. When both are present for long enough (often around 40 ms or more), it reports that key. Short tones and short gaps can be missed, so the defaults here are 100 ms tone and 100 ms gap, and the gap cannot go below 40 ms so repeated digits stay separate. Plan your menu with the IVR Flow Builder, write the prompts with the IVR Script Generator and voice them with the IVR Voice Generator.
IVR Flow Builder
Design IVR phone menu flows visually
IVR Script Generator
Generate IVR scripts
IVR Voice Generator
Generate professional IVR voice prompts in 13+ languages with templates and SSML
Erlang C Calculator
Calculate call center agents required for target service level
Twilio Voice Pricing (Global)
Compare Twilio voice pricing per minute across 50+ countries
Voice Widget Generator
Generate the embed code to add an AI voice assistant widget to your website
What DTMF is, how IVR systems use keypresses, why keypresses sometimes fail to register, and what to check when callers say the menu is not responding.
When an AI voice agent should ask callers to press keys instead of speaking: confirmations, order numbers and noisy lines. Never for PINs or OTPs.
Built by Edesy
Edesy builds AI products for Indian businesses. Start self-serve, no demo call needed.
AI agents that answer and make phone calls 24/7. Handle appointments, inquiries and support in Indian and global languages.
₹50 free credit. No demo call needed.