Compress audio files online - MP3/WAV/OGG/AAC support, client-side processing
Drag and drop audio file here, or click to select
Supports MP3, WAV, OGG, AAC, FLAC, M4A formats
Audio compression reduces file size by lowering the bitrate, sample rate, or merging channels. Lower bitrate means smaller files but reduced audio quality. This tool uses the browser's MediaRecorder API for encoding, all processing is done locally.
Input supports MP3, WAV, OGG, AAC, FLAC, M4A and other common formats. Output format depends on browser support, typically MP3, WebM (Opus), and OGG (Opus). Chrome/Edge support the widest range of output formats.
Recommendations: 64-96kbps for voice/podcasts, 128kbps for general music, 192-320kbps for high-quality music. Mono files are about half the size of stereo files.
Completely safe. All processing is done locally in your browser using Web Audio API and MediaRecorder API. Your audio files are never uploaded to any server.
There will be some quality reduction, which is inevitable with lossy compression. Lower bitrates reduce audio detail, but 128kbps MP3 is virtually indistinguishable from the original for most listeners.
Yes, Audio Compressor is completely free to use. No registration or login required — all features are available immediately.
Yes. Audio Compressor is fully responsive and works on phones, tablets, and desktops. The interface adapts automatically to your screen size.
No. Audio Compressor is a web-based tool — just open it in your browser and start using it. No downloads, plugins, or extensions required.
Absolutely. All processing happens locally in your browser. No data is sent to any server, so there's zero risk of data leaks. Your information stays completely under your control.
Audio Compressor has no usage limits — it's free and unlimited. Since processing is done client-side, speed depends on your device. For very large files, we recommend processing in batches for the best experience.