Channel-Only Boost
Add gain to just the left or just the right channel of a stereo file. Fix imbalanced interviews and lopsided field recordings without touching the other side.
Drop your audio file here
or click to browse a file
Boost just the left or right channel of a stereo file. Mono files become stereo with one side boosted.
Channel
+6 dB doubles the channel's perceived loudness. Above +12 dB risks clipping if the source channel was already loud.
About channel-only boost
Sometimes a stereo recording is lopsided — one mic was further from the speaker, a guest's lavalier was clipped to the wrong shirt, or a field recorder ended up with its left input set lower than its right. This tool lets you add gain to just one side of the stereo image without touching the other side, so the loud channel stays where it was and the quiet channel catches up.
Pick the channel that needs catching up, dial in how much gain you want, render. The output is a normal stereo file in the same format as the input.
How to boost one channel
- 01
Drop your stereo file
MP3, WAV, FLAC, OGG, AAC, M4A — any common format. Mono input becomes stereo with one boosted side.
- 02
Pick left or right
Pick the quieter channel — the one that needs catching up.
- 03
Set gain and render
+6 dB doubles the channel's perceived loudness. Watch for clipping above +12 dB on already-loud sources.
Why use channel-only boost
- Per-channel gain — left or right, never both
- Up to +20 dB per channel
- Same input format on the way out
- Free, private, no install
- Cleanly fixes lopsided two-mic interviews and field recordings
- Useful for ASMR mixers and stereo-imbalance correction
Channel boost FAQ
How is this different from the volume booster?
The volume booster raises the whole stereo image (both channels equally). This tool raises just one side and leaves the other side at its original level.
What if I want to lower one channel instead?
For now this tool boosts only. If you want to attenuate one side instead, run the file through the multi-track mixer or use the EQ on a stereo split.
Does it work on mono files?
Yes — mono input is treated as a duplicated stereo signal. The output will be true stereo with one side gained up.
Will it cause clipping?
It can. The tool multiplies the linear sample values by the gain factor, so if your chosen channel was already near full-scale, +6 dB will clip the peaks. Above +6 dB on a loud source, listen back and re-render with less if you hear distortion.
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