Tools / File Converter / F4V to AU Converter

F4V to AU Converter

Convert F4V files to AU. Free, without uploading.

This tool converts F4V files to AU. Flash MP4 video.

Sun/NeXT audio. Only the audio of the F4V video is kept and saved as AU; the picture is dropped. AU is lossless, so the audio keeps the quality it has in the F4V 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 F4V video, 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 F4V file is converted to AU inside your browser.