MP4 is a video container — keeping the whole file just for the audio is bulky. Extract the track to lightweight M4A for Apple devices.
About MP4
Common video container format
MP4 is the most widely used video container, bundling video, audio (usually AAC), and subtitles together; this tool extracts the audio track and converts it to common audio formats.
- Excellent compatibility — plays on nearly every device and platform
- Requires extracting the audio track first; the full video file is much larger than the audio alone
About M4A
Common audio container in Apple ecosystem
M4A is an MPEG-4 audio container, usually AAC or ALAC encoded, widely used across Apple devices and iTunes with a good balance of size and quality.
- Good balance of size and quality
- Native to the Apple ecosystem
- Limited support on some non-Apple players
MP4 to M4A FAQ
Will converting MP4 to M4A lose quality?
Both MP4 and M4A are lossy formats. Re-compression may further reduce quality — choose a higher bitrate to minimize additional loss.
Will the file size change after conversion?
Converting to a lossless format (WAV) usually increases size, while converting to a lossy format (MP3, AAC) usually decreases it, depending on the chosen bitrate and sample rate.
How do I batch convert MP4 to M4A?
Just drop multiple MP4 files in; they are converted to M4A one by one via a queue. You can download them individually or as a single ZIP.