MP3 Compressor — Compress Audio Files Online Free
Compress MP3 and audio files in your browser. Re-encode WAV, M4A, FLAC, and MP3 to a smaller MP3 — free, private, no upload, no sign-up.
Drop your audio file here, or click to browse
Files are processed in your browser — nothing is uploaded.
What is an MP3 compressor?
What is it
An MP3 compressor reduces the size of an audio file by re-encoding it at a lower bitrate. filecompressor.app uses FFmpeg compiled to WebAssembly, so the process runs entirely in your browser and your audio never gets uploaded.
It accepts MP3, WAV, M4A, OGG, and FLAC, outputting a smaller standard MP3 that plays on every device. The result is private, free, and easy to share.
How to compress an MP3
How to use
Compressing audio is fast and private:
- 1
Drop your MP3, WAV, M4A, OGG, or FLAC file into the dropzone above, or click to browse.
- 2
The compressor re-encodes the audio to a smaller MP3 at a balanced bitrate, then shows the new size and percentage saved.
- 3
Click Download to save the smaller MP3. The output plays on every phone, computer, and music app.
Why use this MP3 compressor?
Why use it
100% private — audio is processed in your browser and never uploaded.
Free with no sign-up, no watermarks, and no limits.
Accepts MP3, WAV, M4A, OGG, and FLAC, outputting a universal MP3.
Up to 60% reduction with quality that stays clear for casual listening.
Works on desktop and mobile with no app install.
FAQ
Common questions about this compression tool.
Frequently Asked Questions
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