How to convert WebM to M4A (AAC/ALAC)
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Upload your file
Drag and drop a file or click to select one. Keep this page open while the file uploads and converts.
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Convert WebM to M4A (AAC/ALAC)
NexMedia converts WebM to M4A (AAC/ALAC) on its own servers. Processing time depends on the file size and how busy the queue is.
- 3
Download the converted file
When the conversion finishes, the download appears on this page. Your converted file is kept for 2 hours, then deleted.
About WebM
WebM is an open, royalty-free video format developed by Google and based on the Matroska container. It holds VP8, VP9 or AV1 video with Vorbis or Opus audio.
It is made for the web: all major browsers play it in the HTML video element, and it is common for screen recordings and short clips.
WebM allows only its own small set of codecs, so H.264 video or AAC audio has to be re-encoded to fit.
Convert WebM to M4A online free, no account required — M4A is an MPEG-4 audio file, usually holding AAC.
Change WebM to M4A without losing quality — convert WebM to M4A free in your browser.
Why can't I upload my WebM video to Instagram or TikTok? Social apps almost always demand MP4, so a WebM made for the web needs converting before it will upload.
About M4A (AAC/ALAC)
M4A is an MPEG-4 audio file: the MP4 container holding only audio, usually AAC and sometimes Apple Lossless (ALAC).
Music bought on iTunes, iPhone voice memos and many podcast downloads.
Whether an M4A is lossy or lossless depends on the codec inside, which the file extension does not show.
Why convert audio to M4A? It wraps efficient AAC audio with chapter marks and cover art in one small file that Apple, Android and Windows all play.
What changes when you convert WebM to M4A
- The soundtrack of the WebM is re-encoded as M4A at the default settings, so it is close to the original but not bit-identical.
- Only the sound is kept: the M4A file contains the audio track of your WebM, and the picture is dropped.
Settings you can change
Before you convert WebM to M4A, you can adjust: Audio codec, Rate control, Audio bitrate, Quality (VBR), Sample rate, Channels, Normalize loudness, Trim start, Trim duration, and Keep tags.
Limits
Each plan sets a maximum file size and a number of conversions per day, and video and audio files also have a maximum length. Guests can convert files up to 100 megabytes and 5 per day; a free account raises this to 500 megabytes and 25 per day; paid plans go up to 100 gigabytes.
Your converted M4A file is kept for 2 hours, then deleted.
WebM to M4A: questions and answers
Does converting WebM to M4A reduce quality?
The soundtrack of the WebM is re-encoded as M4A at the default settings, so it is close to the original but not bit-identical.
What is the difference between WebM and M4A?
WebM is an open, royalty-free web video format with VP8, VP9 or AV1 video and Opus or Vorbis audio. M4A is an MPEG-4 audio file, usually holding AAC.
Can I change the settings when converting WebM to M4A?
Before you convert WebM to M4A, you can adjust: Audio codec, Rate control, Audio bitrate, Quality (VBR), Sample rate, Channels, Normalize loudness, Trim start, Trim duration, and Keep tags.
Do I need an account to convert WebM to M4A?
No. You can convert WebM to M4A without an account; signing in raises the file-size and daily limits.
How long is my converted M4A file kept?
The M4A file you convert from WebM is kept for 2 hours, then deleted automatically.
When I convert WebM to M4A, can I keep just the sound?
Only the sound is kept: the M4A file contains the audio track of your WebM, and the picture is dropped.
Will converting WebM to M4A change my original file?
No. The conversion reads your WebM and writes a new M4A file, leaving your original WebM file untouched.