PureConverter

Convert WEBM to M4A

Convert WEBM files to M4A locally, completely free and with maximum privacy.

Drag and drop your files here

or click to browse local files (large files supported, limited only by browser RAM)

Upload Files

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How to convert WEBM to M4A

  1. Drop your .webm files above, or click Upload Files. You can add many files at once.
  2. M4A is already selected as the output. Open the settings (gear icon) to fine-tune the result.
  3. Click Convert All. FFmpeg runs inside your browser through WebAssembly; nothing is uploaded.
  4. Download your .m4a files as soon as each one finishes.

What to know about WEBM to M4A conversion

  • Only the audio track of the WEBM video is kept and encoded as M4A; the picture is discarded.
  • Videos without an audio track cannot be converted to audio.

WEBM vs M4A

WEBM (WebM Video Container): An open, royalty-free media file format designed for sharing video content directly on HTML5 web pages.

M4A (MPEG-4 Audio): An audio-only file extension for MPEG-4 files, commonly encoded with AAC or ALAC codecs for high quality.

Conversion options

  • Bitrate from 96 to 320 kbps
  • Apple Lossless (ALAC) mode
  • Sample rate: 22.05, 44.1 or 48 kHz
  • Mono, stereo or 3D spatial audio
  • Playback speed (0.5× to 2×)

Frequently asked questions

Is it safe to convert WEBM to M4A here?

Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.

Is there a file size limit?

There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.

Can I convert several WEBM files at once?

Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.

Related conversions

Convert WEBM to other formats

Convert other formats to M4A

See every WEBM converter and M4A converter, or browse the full converter directory.