AUDIO · COMPRESS
Compress
Pick a bitrate and compress to mp3.
First run downloads the engine (~31MB)
- 1.Add an audio file.
- 2.Choose either bitrate mode or target-size mode.
- 3.Adjust the kbps slider or target size (MB) — the estimated file size updates instantly.
- 4.Click Compress, then download the compressed result.
→ Output: A size-reduced MP3 re-encoded at the bitrate you choose.
Upload a file and run to see the result.
About this tool
Reduces file size by lowering the bitrate. Speech recordings stay intelligible at bitrates well below what music needs, so they can shrink a lot. Processing finishes inside the browser.
When to use it
- —Getting a long meeting recording small enough to email
- —Lightening a batch of voice files for archiving
- —Meeting an upload size limit
Good to know
- —Compression is not reversible; raising the bitrate later does not restore lost quality, so keep the original.
- —Speech holds up around 64 kbps, but music degrades noticeably at that rate.
- —Recompressing an already compressed file stacks the losses and sounds worse.