Stereo to Mono Converter
Mix stereo audio down to mono for podcasts, voice recordings, phone systems and smart speakers — or keep only one channel when a mic was recorded on the left or right. Bonus: a simple vocal remover for karaoke. Private and free.
- No upload
- Mix, left or right
- Vocal remover
- Free
Drop audio files here
or
You can also paste with Ctrl+V (⌘+V on Mac) or drop a whole folder.
MP3 · WAV · M4A · AAC · FLAC · OGG · OPUS · MP4 / MOV video
Your files are processed on your device and are never uploaded.
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Done — your files are ready
You changed the settings — click the button again to update the result.
How to convert stereo to mono
Three steps.
- 1
Add stereo files
Drop one or more audio or video files onto the page.
- 2
Choose the source
Mix both channels, keep left or right, or remove the vocals.
- 3
Convert & download
Listen, compare and download the mono files.
Clean mono downmixes
For voice, broadcast and compatibility.
Proper downmix
Left and right are averaged, so the result never clips. 5.1 files use standard downmix coefficients.
One channel
Rescue interviews where each person was recorded on a separate side.
Vocal remover
Cancel the centre-panned voice to make a quick karaoke or practice track.
Smaller files
Mono WAV and FLAC files are half the size of stereo ones.
A/B compare
Switch between stereo original and mono result.
Batch
Convert whole folders and download a ZIP.
Private
Your recordings stay on your device.
Free
No limits, no watermark.
When should you use mono?
Most speech — podcasts, audiobooks, lectures, voice messages — gains nothing from stereo. Mono files are easier to process, sound the same on every speaker and, for uncompressed formats, are half the size.
If an interview was recorded with one microphone per channel, keep both in a mix — or pick left only / right only when one side contains just noise.
The vocal remover subtracts the right channel from the left. Everything recorded identically in both channels — typically the lead vocal, bass and kick drum — cancels out, while instruments panned to the sides remain. Results depend on the mix and work best on studio recordings.
File size per minute (WAV 16-bit / 44.1 kHz)
| Channels | Size | Typical use |
|---|---|---|
| Stereo | 10.1 MB | Music |
| Mono | 5.0 MB | Speech, podcasts, phone systems |
| 5.1 surround | 30.3 MB | Film |
Tips
- Make mono files even smaller with the MP3 Compressor (64 kbps mono is ideal for speech).
- Need stereo again later? Use Mono to Stereo.
- Even out the level with the Volume Normalizer.
- Check the channel layout with the Audio Metadata Viewer.
Frequently asked questions
Can’t find your answer? Contact us — we reply quickly.
How do I convert stereo audio to mono?
Drop the file onto this page, keep “Both channels” selected and click “Convert to mono”.
Will the mono file be quieter?
Mixed mono is the average of both channels, so centred sound keeps its level; sound panned hard to one side becomes about 6 dB quieter.
Can I keep only one channel?
Yes — choose “Left only” or “Right only”.
How does the vocal remover work?
It subtracts one channel from the other, removing everything that is identical in both — usually the lead vocal. It is a quick effect, not studio-quality stem separation.
Does mono make files smaller?
For WAV and FLAC, yes — about half the size. For MP3/M4A the size depends on the bitrate, which you can lower for mono.
Are my files uploaded?
No. Everything is processed in your browser.
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