From phone clips to browser recordings
Accepts MP4, MOV, WebM, MKV, AVI, M4V, MPEG, MPG, and MPEG-TS (.ts). The first audio track is converted; unusual source codecs may not decode.
Video to M4A Converter
Convert MP4, MOV, WebM, MKV and more to AAC in M4A at 128, 192 or 256 kbps. Trim video audio locally in your browser without uploading your files.
Local conversion workspace
Convert video to audio
Your video stays on this device. Processing starts only after you click Convert.
0 bytes uploaded
0 bytes uploadedMulti-thread mode is used only when this browser supports SharedArrayBuffer and cross-origin isolation.
Video to M4A
Audio for your phone and everyday listening
Convert different video containers into AAC audio in an M4A file. Choose the settings for your recording, not just its extension.
A bitrate for each listening task
Use 128 kbps for speech, 192 kbps for mixed content, or 256 kbps when music matters. Higher bitrate cannot recover detail already lost in the source.
Keep only the part you need
Trim a lecture, interview, or music segment before conversion. Shorter clips take less storage and reduce the amount of audio to encode.
Three steps
How to convert video to M4A
M4A is preselected with the balanced 192 kbps setting. No account or video upload is needed.
Select a local video
Choose one video up to 500 MB. Large files can still exceed available memory, especially on mobile devices.
Set the bitrate and time range
Choose 128, 192, or 256 kbps. To keep a two-minute clip, for example, enter 60 seconds as the start and 180 seconds as the end.
Convert, listen, and download
Convert the selected range, preview the result, and download the M4A. Check it in your intended player and keep the original video.
Browser-local processing
Your video stays on your device
ffmpeg.wasm processes the first audio track inside a browser Worker. M4A mode always re-encodes it as AAC, even if the source already uses AAC.
- Neither the video nor the output audio is uploaded to a conversion server
- One file at a time, up to 500 MB; available device memory can impose a lower practical limit
- Completion or cancellation terminates the Worker and releases its temporary file system
FAQ
Video to M4A questions
Understand input compatibility, quality, file size, trimming, and playback before converting.
MP4, MOV, WebM, MKV, AVI, M4V, MPEG, MPG, and MPEG-TS (.ts) are accepted. Each needs a decodable audio track. A supported extension does not guarantee every codec inside it will work; only the first audio track is converted.
No. This tool writes AAC in M4A using lossy re-encoding, including when the source already contains AAC. Choose Original mode to copy encoded audio into MKA without re-encoding. Original trimming follows audio packet boundaries.
128 kbps is a compact choice for lectures and interviews. The default 192 kbps balances size and everyday listening. Choose 256 kbps when music matters and a larger file is acceptable. No setting restores missing source detail.
For ten minutes, 128, 192, and 256 kbps correspond to about 9.6, 14.4, and 19.2 MB before container overhead. Actual sizes vary. Size depends mainly on duration and bitrate, so M4A is not automatically smaller than a lower-bitrate MP3.
Yes. Set the start and end times before converting. M4A mode re-encodes the selected range. Keep the end after the start and within the video duration when it is available.
M4A with AAC suits phones and modern players that support it. MP3 is useful for older equipment or unknown recipients; WAV is an uncompressed editing intermediate. Original preserves encoded audio in MKA, which may need a compatible player. Test the output on the destination device.
Related tools and guides
Choose the right audio workflow
Explore MP4-specific conversion, editing audio, original extraction, and format trade-offs.
MP4 to M4A
Working specifically with MP4? Learn how its container and audio track relate to M4A.
Convert MP4 to M4AVideo to WAV
Create a 16-bit, 48 kHz stereo PCM file when your next step is audio editing.
Convert video to WAVExtract original audio
Avoid re-encoding by copying the original track into MKA. Trimming follows packet boundaries.
Extract the original trackMP3 vs WAV vs M4A
Compare playback compatibility, quality, and file size before choosing your output.
Compare audio formats