Compress audio files to MP3
Reduce the size of voice notes, recordings and music by re-encoding them as MP3 at a lower bitrate.
FFmpeg WebAssembly EngineThe engine (~25MB) loads from a CDN on first run, then processes everything locally.
Upload media (MP4, MOV, MP3, WAV…)
or click to browse your files
Max File Size: 200MBHow to use the Compress Audio tool
- 1Choose or drop an audio file.
- 2Pick a bitrate — 128 kbps suits music, 64 kbps is fine for speech.
- 3Convert and download the compressed file.
Good to know
- Your files are processed in your browser and never uploaded to our servers.
- Powered by FFmpeg compiled to WebAssembly; the engine downloads once on first use.
- Output can be MP3 (compressed) or WAV (uncompressed).
Frequently asked questions
What bitrate should I use?
128 kbps is a good default for music; 64–96 kbps is plenty for speech and podcasts.
Can I compress a WAV file?
Yes. Converting WAV to MP3 usually reduces the size by around 90%.
Does it compress video?
No — this tool outputs audio only. To get the soundtrack from a video, use Video to MP3.
Related tools
Video to MP3Extract the audio track from MP4, MOV and WebM videos and save it as MP3. Free, private and runs in your browser with FFmpeg.Trim AudioCut a section out of an audio file by start and end time and save it as MP3 — for ringtones, clips and podcasts. Free and in your browser.Compress ImageReduce image file size with an adjustable quality slider. Compress JPG, PNG and WebP photos for web, email and forms — free, without uploading.