Audio Compressor
Reduce audio file size while maintaining quality. Customize compression settings.
Drop an audio file here
or click to browse • Supports MP3, WAV, OGG, FLAC, M4A
🔒 Privacy First
All compression happens in your browser. Your audio files are never uploaded to any server.
How Audio Compression Works
Bitrate Reduction
Lower bitrate means smaller files. 128 kbps is good for most uses, 64 kbps for voice/speech.
Sample Rate
22 kHz is fine for speech, 44.1 kHz (CD quality) for music, 48 kHz for professional audio.
Mono vs Stereo
Mono (1 channel) is half the size of stereo. Use mono for voice recordings and podcasts.
Recommended Settings
| Use Case | Bitrate | Sample Rate | Channels |
|---|---|---|---|
| Voice/Speech | 64 kbps | 22.05 kHz | Mono |
| Podcasts | 96 kbps | 44.1 kHz | Mono |
| Music (Standard) | 128 kbps | 44.1 kHz | Stereo |
| Music (Quality) | 192+ kbps | 44.1 kHz | Stereo |
Frequently Asked Questions
How much can I reduce my audio file size?
The amount of compression depends on your settings. Switching from 320 kbps to 128 kbps can reduce file size by roughly 60%, while converting stereo to mono cuts it in half again. For voice recordings, using 64 kbps mono can shrink files by up to 90% compared to the original.
Will compressing audio make it sound noticeably worse?
At 128 kbps or higher, most listeners cannot distinguish compressed audio from the original in casual listening. Quality loss becomes more apparent below 96 kbps, especially with music that has complex instrumentation or high-frequency details.
What is the best bitrate for podcasts and voice recordings?
For podcasts and voice content, 64-96 kbps mono is the sweet spot. Human speech occupies a narrow frequency range, so lower bitrates preserve intelligibility well while keeping file sizes small enough for streaming and downloads.
Is my audio file uploaded to any server during compression?
No, all compression happens entirely in your browser using the Web Audio API. Your audio files never leave your device, ensuring complete privacy and security for sensitive recordings.
What output format does the compressor produce?
The browser-based compressor outputs WebM/Opus format, which offers excellent compression efficiency. If you need MP3 or another format, you can use our Audio Converter tool to convert the compressed file afterward.