Audio Compressor
Shrink MP3, WAV, AAC, OGG, and M4A audio files to a fraction of their size with quality-preserving bitrates.
How to Use Audio Compressor
Select or drop your audio file (MP3, WAV, OGG, AAC, FLAC, M4A).
Pick a compression profile: High Fidelity (192 kbps), Balanced (128 kbps), Compact (96 kbps), or Voice Mode (48 kbps mono).
Click "Compress Audio" and watch the live encoding progress.
Compare the before/after sizes and download your compressed audio.
About Audio Compressor
Reduce audio file sizes for email attachments, messaging apps, podcast uploads, and storage savings. Choose a target quality profile (from studio-grade 192 kbps down to voice-optimized 48 kbps), optionally downmix stereo to mono, and let the bundled FFmpeg encoder re-encode your track entirely inside your browser. A live before/after size comparison shows exactly how much space you saved, with zero uploads โ your audio never leaves the tab.
Frequently Asked Questions
How much smaller will my audio file get?
Re-encoding an uncompressed WAV to 128 kbps MP3 typically cuts size by 90%+. Compressing an already-compressed 320 kbps MP3 to 128 kbps saves around 60%. Voice Mode with mono downmix produces the smallest files โ a one-hour voice recording can drop to roughly 20 MB.
Will compression hurt the audio quality?
Some fidelity loss is inherent to lossy re-encoding, but 192 kbps is transparent for almost all listeners, and 128 kbps is the global standard for music streaming. Voice Mode (48 kbps mono) is tuned for speech recordings and sounds crisp for talking content.
Is my audio uploaded to a server?
Never. The FFmpeg encoder compiled to WebAssembly runs inside your browser tab, processing the file in memory. Nothing touches the network.
Can I compress a video file's audio track with this?
This tool accepts audio files. To shrink a video (including its audio), use the Video Compressor instead โ it applies the same local-processing approach to the whole file.
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