Enter a whole-number frequency across the commonly cited human-audible range.
HZ / AVAILABLE NOW
Tone Generator
A clean signal on demand. Create sine, square, triangle, or saw tones from 20 Hz to 20 kHz.
Local audio labFiles never leave this tab
Signal generator440 Hzsine wave · 3s
00:00LOCAL BUFFER--:--
Preview controls appear after you add or generate audio.
GUIDE / online tone generator
What is an online tone generator?
An online tone generator creates a steady audio signal at a selected frequency and waveform. SoundTools generates sine, square, triangle, or sawtooth tones from 20 Hz to 20 kHz inside your browser. Choose a duration and level, create a short WAV with safety fades, preview it, and save it without uploading any source file.
FIELD NOTES / 01
Choose the signal that fits the test
A sine wave contains one fundamental frequency and is the clearest starting point for speaker checks or pitch reference. Square and sawtooth waves contain stronger harmonics and sound brighter; triangle waves are softer but still contain harmonics beyond the fundamental.
The generator supports 0.5- to 10-second files and levels from 5% to 80%. A short fade is applied at both ends to reduce clicks. It creates a downloadable test signal, not a calibrated sound-pressure level, hearing diagnosis, or laboratory measurement.
PROCESS / THREE STEPS
How to generate an audio tone online
- 01
Enter a frequency
Choose any whole-number frequency from 20 Hz to 20,000 Hz. Concert A at 440 Hz and a 1 kHz reference tone are useful starting points.
- 02
Select waveform, time, and level
Pick sine, square, triangle, or sawtooth, then set a duration from 0.5 to 10 seconds and begin at a low output level.
- 03
Generate, preview, and save
Create the signal locally, listen at a safe volume, and download the generated tone as a WAV file when it matches your needs.
SIGNAL NOTES / VERIFIED BEHAVIOR
What this tool actually does
Clear limits are part of a useful tool. These values describe the processor currently running in this page.
Generate sine, square, triangle, or sawtooth samples.
Export a short mono signal with gentle fades at the beginning and end.
USE CASES / 02
Common tone-generator uses
- Speaker and headphone checks
Listen carefully for rattles, dropouts, or obvious differences at selected frequencies, starting at low volume.
- Music and pitch reference
Create a 440 Hz A, another tuning reference, or a stable note to compare by ear.
- Production test signals
Export a short sine or harmonic-rich waveform for an edit, classroom demonstration, device check, or signal-path test.
QUESTIONS / PRACTICAL ANSWERS
Questions about this tool
Answers based on the current browser processor—not promises about a future version.
01What frequency range can the tone generator create?
The interface accepts whole-number frequencies from 20 Hz to 20 kHz, covering the commonly cited audible range. Your speakers, headphones, and hearing may reproduce a smaller range.
02Which waveform should I choose?
Start with sine for a clean single-frequency test. Square and sawtooth sound brighter because they contain more harmonics, while triangle is a softer harmonic-rich option.
03Can I download the generated frequency?
Yes. Choose a duration from 0.5 to 10 seconds, generate the tone, preview it, and download the mono result as a WAV file.
04Is this an accurate hearing test?
No. Device response, room acoustics, output level, and background noise are not calibrated. The generator can provide reference tones but cannot diagnose hearing ability.
05Does the tone generator upload anything?
No source file is needed. The waveform is calculated locally in the browser and converted directly into a downloadable WAV.