Phase 3 · Audio · On-device, no AI
Compress MP3 Audio
Reduce audio bitrate to create a smaller 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
Make voice notes or lectures easier to share. 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.