Audio converters
Compress Audio
Make audio files smaller for email and uploads by re-encoding them as a lower-bitrate MP3.
Drop audio files here, or click to choose
Up to 3 files, 200.0 MB each · Files stay on your device
How it works
How to use the Compress audio converter
- Drop your MP3 files into the box.
- Choose a quality and, if you like, a start and end time.
- Click Convert and download the MP3.
Formats
About the formats
- MP3 audio
- MP3 is the universal compressed audio format. It plays on every device.
- WAV audio
- WAV is uncompressed audio. Quality is perfect but files are about ten times bigger than MP3.
- M4A (AAC) audio
- M4A is AAC audio in an MP4 container, used by iTunes, Apple Music and voice memos. It sounds better than MP3 at the same size.
FAQ
Frequently asked questions
Are my files uploaded?
No. The conversion runs inside your browser using WebAssembly, so your files never leave your device. Nothing is sent to our servers.
How big can my audio files be?
Up to 200 MB each on the free plan and 2 GB with Pro. Very large files depend on your device's memory.
Why is the first conversion slower?
The first time, your browser downloads the converter (a few MB). It's cached, so later conversions start right away. Where your browser supports it, video uses your device's hardware encoder.
Keep going
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