Online Tool Store
Stereo to Mono Converter
Merge a stereo audio file's channels into a single mono channel by averaging samples, then preview and download it as a WAV file in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
How the stereo to mono converter works
- Choose an audio file.
- Click Convert to mono — every channel is decoded and averaged together, sample by sample, into a single channel.
- Preview the result and download it as a WAV file.
The method
mono sample = (left sample + right sample) ÷ number of channels
Averaging rather than dropping a channel keeps content that's present on both channels (like a centered vocal) at its original volume, and blends content that differs between channels — the standard approach most audio software uses for a stereo-to-mono downmix.
FAQ
Why would I want mono instead of stereo?
Voice recordings, podcasts, and voicemail greetings are often better as mono — it avoids stereo separation quirks on mono playback systems (like phone speakers), and produces a smaller file since there's only one channel to store.
Does merging channels reduce volume or quality?
This tool averages the channels together rather than simply discarding one, which preserves the overall loudness better than a naive "just keep the left channel" approach. Content that's identical in both channels merges cleanly; content that's different (like some stereo music) blends together.
What if my file is already mono?
The tool detects that and still produces a mono WAV — there's nothing to actually merge, but the output will match your original.
Is my audio uploaded anywhere?
No. Decoding and merging both happen using the Web Audio API directly in your browser — the file is never sent to Online Tool Store or any other server.
How we compare
| Feature | Online Tool Store | Audacity (desktop app) | Online Audio Converter |
|---|---|---|---|
| No install required | ✓ | Desktop app install | ✓ |
| File never uploaded to a server | ✓ | ✓ | Uploads to server |
| Free, no watermark | ✓ | ✓ | ✓ |
For a quick stereo-to-mono merge without installing audio editing software, the Online Tool Store Stereo to Mono Converter does it right in your browser.