Free online AVR to M4A converter

What the AVR format is

AVR means Audio Visual Research in the audio-format context. It is an older digital audio format associated with Audio Visual Research software and hardware, and it is commonly encountered in archived recordings, sample libraries, and files exported by legacy audio applications.

AVR files generally contain sampled audio such as uncompressed PCM, with the exact bit depth, channel count, and sample rate depending on the file variant. Modern players and editors do not consistently support the format, so conversion software may need to decode the file before creating a newer audio container.

What the M4A format is

M4A is an MPEG-4 audio filename extension. It normally contains AAC audio for compact, broadly compatible files, or ALAC audio when lossless storage is required.

AAC M4A files are suitable for phones, media players, messaging, and general sharing because they are much smaller than uncompressed audio at comparable listening quality. ALAC M4A preserves the decoded source audio but produces larger files and may have less support outside Apple-oriented software.

How to convert AVR to M4A

Using the online converter

1. Open the AVR-to-M4A converter on 101convert.com.
2. Upload the .avr file and select M4A as the output format.
3. Choose an AAC quality or bitrate if the converter provides that option. Use about 128–192 kbps for speech and 192–256 kbps for general music.
4. Start the conversion and download the resulting .m4a file.
5. Play the output from beginning to end and check its duration, channels, and volume before deleting the AVR original.

Using FFmpeg on a desktop

FFmpeg can decode AVR files when the installed build includes its AVR demuxer. In a terminal, run:

ffmpeg -i input.avr -c:a aac -b:a 192k output.m4a

Replace input.avr with the actual filename. The command creates a broadly compatible AAC M4A file. To inspect whether FFmpeg recognizes the source and identify its audio properties, run:

ffprobe input.avr

For a lossless M4A output, use Apple Lossless instead:

ffmpeg -i input.avr -c:a alac output.m4a

If FFmpeg reports that the input format is unknown or cannot decode the file, use a desktop audio converter with AVR import support, such as Awave Studio, then choose Export or Save as M4A. AVR variants are not always identical, so a converter that opens one file may not open every AVR recording.

Quality, compatibility, and limitations

Converting AVR to AAC M4A is normally a lossy re-encoding step: the source is decoded and AAC discards some information. Do not repeatedly convert between lossy formats. Use ALAC when retaining the decoded source is more important than file size, but note that ALAC does not restore information already absent from the AVR file.

Keep the original AVR file as an archival master. If the AVR contains speech, prioritize intelligibility over a high music bitrate; for music, avoid reducing the sample rate unless the destination requires it. Verify that the output preserves the original duration and channel layout, because some legacy AVR files contain metadata or channel configurations that newer software may interpret differently.