Audio Compressor & MP3 Reducer

Reduce large audio files to your exact target size or bitrate. Features mono channel downmixing, custom sample rates, and side-by-side A/B audio quality preview on your device.

Target Size (MB/KB) Mono Downmix A/B Audio Player → Lightweight MP3
Compression Engine LameJS CBR Encoder
Size Savings Up to 85% Reduction
A/B Audition Live Dual-Track Player
Privacy 100% In-Browser Execution
original size • duration

Select an audio file to compress

Supports MP3, WAV, M4A, FLAC, OGG, and AAC up to 100MB

Choose Audio File

•

MB

Calculated optimal bitrate:

Audio Channel Optimizations

Resample Audio Rate

Lower sample rates reduce high frequency data load.

A/B Audio Comparison

Compression Summary

Estimated storage savings

Original Size:
Estimated Compressed:
Space Saved:
Local Compression Guarantee

Unlike online converters that transmit files to third-party web servers, this audio compressor encodes audio locally inside your browser with LameJS 1.2.1.

Encoder Engine: LameJS 1.2.1 (LGPL-3.0)
Encoding Architecture: Isolated Web Worker
Privacy: Zero Network Transfers

How to Compress Audio Files Online

Learn how to balance file size against perceptual audio quality using bitrate adjustment and mono downmixing.

1

Upload Any Audio Track

Upload large MP3, WAV, FLAC, or M4A voice memos.

2

Select Target Size or Rate

Choose an exact target MB ceiling or select speech-optimized presets.

3

Audition & Download

Switch between Track A and B to verify clarity, then save your MP3.