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Audio Waveform Viewer
Decode an audio file and draw its peak and RMS waveform with zoom and a time axis.
Draw the waveform of an audio file
Duration: —
Sample rate: —
Channels: —
Peak level: —
Status: Choose an audio file to begin
How to use the Audio Waveform Viewer
- Choose an audio file such as a WAV, MP3, OGG or M4A.
- Read the peak and RMS waveform and use the zoom control to look closer.
- Press Play to hear the file with the position marker following along.
Features
- Peak and RMS waveform on one canvas
- Zoom from a full fit to sixteen times
- Time axis labels and an overview strip
- Duration, sample rate, channels and peak level
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Frequently Asked Questions
Common questions about the free online audio waveform viewer.
Choose the audio file and the tool decodes it with the Web Audio API, then draws the peak and
RMS waveform on the canvas straight away.
Any format your browser can decode, which usually means WAV, MP3, OGG, FLAC, M4A and AAC.
The peak band shows the loudest sample in each slice, while the RMS band shows the average
power, which looks much closer to perceived loudness.
Zooming narrows the visible time window around the centre. You can also scroll on the
overview strip to zoom and drag it to pan.
It shows the whole file at once and marks the visible window, so you can jump to any part of
a long recording.
It is the highest sample in the file, shown as a percentage of full scale and in dBFS. Zero
dBFS means the signal is at the digital ceiling.
No. The file is decoded in your browser with the Web Audio API and never leaves your device.
Yes. The analysis is computed once and zooming only redraws a window, so even hour long files
stay responsive.
Yes, it is completely free with no account, no sign-up, no watermark and no limit on file
size beyond your own memory.
Last updated: October 10, 2026