Convert MP4 to AU

There are strong reasons to convert MP4 to AU:

Cross-device access: AU Audio files open seamlessly on Windows, macOS, Linux, iOS and Android — unlike MP4 Video, which may require specialized software.

Embedding support: AU Audio files embed cleanly in websites, documents, and presentations without requiring additional plugins or viewers.

Feature support: AU Audio supports simple format with wide Unix/Linux tool support, which may not be available or optimal in the MP4 Video format.

Metadata handling: AU Audio has robust metadata support, allowing you to embed titles, tags, and descriptions that travel with the file.

Industry standard: In many audio workflows, AU Audio has become the go-to format, making this conversion a frequent necessity.

Converting MP4 to AU with Xonvert is straightforward:

1. Upload source — Drop your MP4 file onto this page. Works with files from any location on your device.
2. Verify and adjust — Check that the source was detected correctly. Tweak advanced options if you're an experienced user.
3. Process — Click Convert. Xonvert's engine handles the MP4 to AU transformation in-browser.
4. Save output — Your AU file downloads with the original name and new extension. Ready for immediate use.

Frame rate, resolution, and aspect ratio are maintained during conversion. Xonvert avoids unnecessary re-encoding when possible. When converting from MP4 Video to AU Audio, the conversion is lossless, meaning every bit of data is preserved exactly as in the original. MP4 Video already discards some data during compression. Converting to AU Audio adds no further quality degradation since it uses lossless compression. Xonvert selects parameters that maximize quality for the target format.

Extracting audio from MP4 Video video to AU Audio format strips the video track and saves only the audio content. This is perfect for extracting music from music videos, saving podcast audio from video recordings, or creating audio-only versions of lectures and presentations. The audio quality depends on the original video's audio track bitrate and codec.

Important: Converting from lossy MP4 to lossless AU does not restore previously discarded data. The output perfectly preserves your current file quality without adding further degradation, but quality lost during the original MP4 encoding cannot be recovered.

Common scenarios for MP4 to AU conversion:

• Cross-platform workflows — Moving from MP4 (Video) to AU (Audio) bridges different tools and operating systems.
• Blog posts — Convert MP4 to AU for faster-loading blog content that improves SEO and reader experience.
• Email attachments — AU files are typically smaller, making them easier to send via email without exceeding size limits.
• E-commerce listings — Online marketplaces like Amazon, eBay, and Etsy prefer AU for product video content.
• Mobile compatibility — AU works across all mobile devices, ensuring playback on phones and tablets.
• Newsletter content — Email marketing platforms have strict format requirements. Converting MP4 to AU ensures your content renders correctly in every inbox.