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About Stereo Width
Stereo Width — free, private, browser-based audio tool
Widen or narrow the stereo image — from mono up to extra-wide. It takes MPEG, MP4, WAV, X-WAV, OGG, FLAC, WEBM, AAC, M4A and gives you WAV, MP3. It runs in your browser, so the file is processed on your own device.
Why use Stereo Width
- ·Files stay on your device — nothing is uploaded
- ·No signup needed
- ·Works in any modern browser, on any OS
- ·Free daily use; Pro removes limits and watermarks
How to use it
- 1Drop a MPEG, MP4, WAV, X-WAV, OGG, FLAC, WEBM, AAC, M4A file on the page, or click to choose one.
- 2Pick the options you want.
- 3Download the WAV, MP3 file.
What Stereo Width does
Widen or narrow the stereo image — from mono up to extra-wide. The result is a WAV, MP3 file you download directly.
How it works
Web Audio API + AudioWorklet for low-latency DSP, ffmpeg.wasm for codec encoding, and a custom WASM SIMD path for time-stretching and pitch-shifting. The processing code runs inside the page, so your file is not uploaded to a server — you can confirm this in your browser's DevTools → Network tab.
Frequently asked questions
Does Stereo Width upload my files?+
No. Stereo Width runs in your browser and processes the file on your device. Nothing is sent to our servers.
Is Stereo Width free?+
Yes, with a daily free allowance and no signup. Xonvert Pro ($4.99/month) removes the daily limits and the watermark on exported files.
Do I need to install anything?+
No. It works in any modern browser on Windows, macOS, Linux, ChromeOS, Android and iPad.
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