Tools / File Converter / AMR to AU Converter

AMR to AU Converter

Convert AMR files to AU. Free, without uploading.

This tool converts AMR files to AU. AMR is a low-bitrate speech format used by older phones and voice recorders.

Sun/NeXT audio. AU is lossless, so the audio keeps the quality it has in the AMR file.

Conversion runs on your device; your file is never sent to a server. The components download once on first use, and later conversions start right away.

How to use

1. Choose the AMR file, drag it in, or paste its link.
2. Choose the audio quality; optionally enter a start and end time.
3. Press "Convert" and download the AU file.

Frequently asked questions

Will audio quality drop when converting to AU?

No. AU is lossless.

Is there a file size limit?

No fixed limit; your device’s memory decides. Computers usually handle files up to 1–2 GB.

Is my file uploaded?

No. Your AMR file is converted to AU inside your browser.