Phase 3 · Audio · On-device, no AI
Extract Left or Right Channel
Save one channel of a stereo recording as mono MP3.
Up to 35 MB desktop / 14 MB mobile combined and 90 seconds per audio file.
Select a local audio file to begin.
Results
Instructions
Choose local audio, adjust the tool settings, press Process in browser and keep this tab open. Listen to the output before download, then delete the temporary result. Some operations use CPU and memory heavily even for short recordings.
How it works
Isolate one microphone from a left/right dual-channel recording. This uses standard deterministic audio decoding and signal filters, not generative AI. Results depend on source codec, channels, sample rate, device performance and actual browser WebAssembly support.