Audio Compressor

Reduce audio file size with bitrate presets — private, free, powered by FFmpeg.

🖥️

Your computer does 100% of the processing — not a server, not the cloud.

FFmpeg runs directly inside your browser via WebAssembly. Your audio files never leave your device.

✓Files stay on your computer — zero upload, zero cloud
✓Works offline once the engine has loaded
⚠First use downloads ~32 MB FFmpeg engine — cached after that

🎵

Drop an audio file here or browse files

MP3 · WAV · AAC · FLAC · OGG · OPUS and more

About the Audio Compressor

Audio compression works by re-encoding the file at a lower bitrate. This tool uses FFmpeg running in your browser via WebAssembly. Your files never leave your device.

Frequently asked

Are my files uploaded? No. FFmpeg runs locally in your browser. Your audio never touches a server.

Can I re-compress an already-compressed MP3? Yes, but re-encoding introduces generation loss. Start from a lossless source (FLAC, WAV) when possible.

Related reading

from the blog

How to Compress Audio Files Without Losing QualityLarge audio files slow down uploads and eat storage. Here's how to reduce file size without making your audio sound noticeably worse.How to Convert HEIC Photos to JPEG or PNG Without Installing SoftwareiPhone saves photos as HEIC by default, but most apps and websites won't accept them. Here's how to convert HEIC to JPEG or PNG instantly in your browser — no app download needed.How to Compress Images Without Losing QualityUncompressed images slow down websites and fill up storage. Here's how to shrink JPEG, PNG, and WebP files without visible quality loss.