MP3 Compressor
Re-encode an MP3 using a selected bitrate to work toward a smaller listening copy. Files must be up to 15 minutes long. The output is not guaranteed to be smaller than every source.
Choose a file
MP3. Maximum 15 minutes per file. 100 MiB on desktop, 50 MiB on touch devices.
Settings
MP3 and M4A use bitrate settings. WAV uses 16-bit PCM, OGG uses quality-based encoding, and FLAC uses lossless compression. Conversion cannot restore lost audio detail.
Result
Your result will appear here.
Files and generated text stay on this device. Processing code is downloaded from ICANDL; speech model files are downloaded from Hugging Face. No media upload or server fallback is used.
This tool was developed by Utilza Team.
How to use MP3 Compressor
- Choose an MP3 file up to 15 minutes.
- Select a target bitrate for the new MP3.
- Compress locally, then compare and download the result.
A lower bitrate can reduce file size
Reducing the bitrate often reduces the data used for each second of audio. The result depends on the original encoding, duration and chosen settings. A file already encoded at a lower bitrate can become larger when processed with a higher setting.
Listen before replacing the original
MP3 compression is lossy, and re-encoding can add artifacts. Speech may tolerate different settings from dense music. Save the original and check the new copy on the device where it will be played, especially when a strict upload size limit applies.
Frequently asked questions
Will compression always make my MP3 smaller?
No. The result depends on the source bitrate and output settings. Compare the final file size instead of assuming every re-encode will reduce it.
Can I target an exact file size?
The selected bitrate affects the expected size, but encoding overhead and other settings can change the result. Check the completed file against your destination's limit.
Does MP3 compression affect sound?
It can. Re-encoding at a lower bitrate may make artifacts more audible, and re-encoding an MP3 does not restore quality.
Where does compression run?
Compression runs on your device in the browser. Accepted MP3 files must be no longer than 15 minutes and still need sufficient browser memory.