Keep just the sound from an MP4
Music videos, lectures, recordings: the audio track lifts out cleanly, instantly when it is already AAC.
Runs in your browser. Your file never leaves your computer.
- Typical caseAAC copied out, lossless
- TimeSeconds, even for long videos
- ResultAudio-only, phone-friendly
- TrimStart and end points
The talk you want to listen to on a run, the concert recording for the car, the lecture for the archive: MP4s often matter for their audio alone. Since MP4 soundtracks are usually AAC, extraction is typically a bit-for-bit copy into an M4A, finished in seconds with zero quality change. Non-AAC audio re-encodes at 256 kbps instead. Trim takes just the segment you need, and the whole operation stays inside your browser.
Questions
Is the audio identical to the video's?
When the track is AAC, bit-identical: it is copied, not converted. Otherwise it is re-encoded at 256 kbps, which is transparent for nearly all content.
Can I take just ten minutes of a two-hour file?
Yes, trim points under More options extract only the span you set.
Does a 4 GB video work in a browser?
Yes, it is read as a stream; size is not the obstacle it sounds.
Related conversions
- MP4 to MP3Audio out of video, in the format the past two decades of hardware agree on. 320 kbps, trimmed as needed.
- MP4 to WebMHardware VP9 or AV1 encoding for the toolchains and platforms that want open-format video.
- WAV to M4AAAC at 256 kbps: better sound per megabyte than MP3, native on every Apple device, fine everywhere else.
- AIFF to M4AFrom a studio-size file to a share-size one: AAC at 256 kbps, native on the Apple gear the AIFF came from.
- FLAC to M4AYour lossless library, made playable on iPhones and everything else, at 256 kbps AAC.
- MP3 to M4AWhen a workflow or app insists on M4A. Honest note: this cannot make the MP3 sound better, only fit better.
Part of convert video in your browser. Every other conversion is on the conversions index.