Slow, so it never pumps.
The gain glides over about half a second, and starts before a change rather than after it.
SOLIPSIUM Super resolution audio engine
Free audio tool
Even out the quiet and loud passages of a recording.
One speaker near the microphone and one far away, or a voice that rises and falls: your browser brings the passages towards the recording's own average. Nothing is uploaded.
Drop a recording here
Your browser does the work on this device. Nothing is uploaded.
WAV, MP3, M4A, FLAC, OGG, Opus and more, up to 30 minutes or 200 MB.
Leveler
How it works
Towards the recording's own average.
The level is read every 50 ms, and each passage is moved towards the average of the passages that are not pauses.
Pauses left alone.
A stretch 30 dB or more under the loudest is a pause; it keeps the gain before it, so its noise is not raised.
Peaks held.
Afterwards the free tools' limiter holds the peaks under -1 dBFS, and the result says for how long it worked.
When to use it
Two voices at two levels.
Levelling helps where the loudness changes between passages, not within a word.
An interview on one microphone.
The near voice comes down, the far one comes up.
A lecture that wanders.
A speaker who turns away and back stays at one level.
Then set the loudness.
Level first, then normalize the result to the target you need.
Questions
About levelling.
Will it raise the noise?
Not in the pauses, which keep the gain before them. Under a quiet voice that is raised, the noise under it comes up with it.
6 or 12 dB?
Start with 6. Use 12 when one voice is much quieter than the other.
Is it a compressor?
It works like a slow one: it moves whole passages, not single words, so the voice keeps its own rise and fall.
How loud is the result?
About as loud as the recording's average was. The loudness checker measures it.
Is my recording uploaded?
No. Your browser opens the file and does the work on this device; nothing is sent to Solipsium. Checking a recording for noise, hum and clipping is another page: the home page checks it in your browser too.
Free audio tools
Related free tools.
For levels.
- Normalize audio
Set the result to a loudness target.
- Make audio louder
Raise a whole recording with a limiter.
- Loudness checker
Measure loudness, peaks and the noise floor.
- Noise gate
Quiet the pauses between words.
- All free audio tools
Every free tool on one page.
A quiet voice under noise?
Raising it raises the noise under it. Drop the recording on the home page to check its noise, and hear its first 20 seconds with a steady floor lowered.
Check a recording
The check and the 20-second try need no account.