Compress Audio
Reduce audio file size for upload and sharing. Works with multiple audio formats.
No signupFast processingAuto file cleanup
Compress Audio
Compress audio files online for free. Supports MP3, WAV, AAC, M4A, OGG and more with bitrate controls.
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Upload a file to get started.
Supported Input and Output
- Accepted input
- MP3, WAV, AAC, M4A, OGG, FLAC, and WMA audio
- Output
- Compressed MP3 audio
- Upload limit
- Up to 25 MB per file under the default server configuration
- Controls
- Output bitrate
What This Processing Changes
The audio is encoded to MP3 at the selected bitrate. Lower bitrates usually reduce size but can make artifacts more audible.
How to Check the Result
- Verify the duration and audio codec in the downloaded file.
- Listen for distortion; increasing bitrate cannot restore discarded source detail.
Limits and Troubleshooting
- Speech usually tolerates a lower bitrate than complex music.
- Repeatedly compressing an already lossy file compounds quality loss.
Related Audio Tools
Worked Example: Encode a WAV tone at 64 kbps for a smaller distribution file.
- Upload tone.wav from the downloadable example.
- Choose bitrate: 64 kbps.
- Process, download, and listen to the complete result.
Check Your Download
- Verify the duration and audio codec in the downloaded file.
- Listen for distortion; increasing bitrate cannot restore discarded source detail.
Limit: The sample is a synthetic tone, not speech or music. Its size and quality are not representative of every recording.
Download the example input and repeat the steps above. These are generated test files, not customer uploads.
- Input bytes
- 176,478
- Output bytes
- 16,553
- Verified result
- 2.000 seconds; mp3
- Test date
- 2026-10-06
Measurements apply to this sample and these settings. Other inputs and codec versions can produce different sizes and results.