How to use Audio Gain Envelope Editor

Select a WAV and enter increasing time, gain dB rows starting at time zero.
Use points before and after each section whose level should change.
Apply the envelope, audition the transitions and download the WAV and settings.

Example: Audio Gain Envelope Editor

Lower one section without trimming it.

You add

One-second mono WAV at 48 kHz. Knots: 0, 0; 0.25, -12; 0.5, 0, each on a separate line.

You get

The output remains one second long. Gain reaches -12 dB at 0.25 seconds, returns to 0 dB at 0.5 seconds and holds there to the end.

Supported inputs and limits

Selected files128 MiB total

Supported duration600 seconds

RIFF WAV only: mono/stereo PCM16, PCM24, PCM32 or float32 at 8–96 kHz; up to 128 MiB and 600 seconds. Compressed WAV, extended headers and other containers are refused. Work stays on your device. Two to 64 points, first time zero, strictly increasing times within the recording. This changes level only; export is PCM16. If needed, one headroom gain scales the entire render.

Where your input is processed

This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.

Interpolation happens in decibels

Between points, gain changes linearly in dB. A -12 dB point multiplies sample amplitude by about 0.251, rather than subtracting a fixed amount from every sample. The final point holds its gain to the recording end; add another point if you want it to recover.

Volume edits can create new peaks

Positive envelope points can request samples above full scale. The render then reduces the whole recording by a single headroom gain, which means absolute output gains differ from the entered points. Review the reported gain and audition the result. This protects sample export; it is not an automatic loudness target or a true-peak limiter.

Questions about Audio Gain Envelope Editor

Does an envelope change speed or pitch?

No. It changes sample gain on the existing timeline.

What happens after the last gain point?

That point’s gain holds to the end of the recording. Add another point if you want the level to change again.

Is my input uploaded?

Nothing is uploaded.

Project manager: Tony Hines · Content updated 4 October 2026 · Report a problem