WEBM to M4A Converter
Convert WebM (WEBM) to MPEG-4 Audio (M4A) online for free. Runs 100% in your browser. Files never leave your device. No signup, no watermarks, no limits.
Drag & drop files here
or
Choose filesProcessed on your device. Nothing is uploaded
How to WEBM to M4A convert files
- 01Add your files
Click “Choose Files” or drag and drop them onto the page. Batch conversion is supported.
- 02Adjust settings
Pick quality, size or other options. Sensible defaults are pre-selected.
- 03Convert & download
Hit Convert and download your files. Everything runs locally. Nothing is uploaded.
What is a WEBM (WebM) file?
WebM is a royalty-free web video format backed by Google, usually carrying VP8/VP9 video and Opus/Vorbis audio. It is optimized for HTML5 streaming.
- Developed by
- Initial release
- 2010
What is a M4A (MPEG-4 Audio) file?
M4A is an MP4 container holding AAC (or lossless ALAC) audio. The standard for iTunes and iPhone voice memos.
- Developed by
- Apple
- Initial release
- 2001
Frequently asked questions
How do I convert WEBM to M4A?
Click “Choose Files” or drag your WEBM file onto the page, optionally adjust the settings, then hit Convert. Your M4A file downloads straight from your browser. Nothing is uploaded anywhere.
Is this WEBM to M4A converter free?
Yes, completely free with no hidden limits, watermarks or signup. Because all processing happens on your own device, there are no server costs to pass on to you.
Are my files uploaded to a server?
No. The conversion engine runs entirely in your web browser using WebAssembly. Your files never leave your device. You can even disconnect from the internet after the page loads and keep converting.
Is there a file size limit?
We impose no fixed limit. The practical ceiling is your device's free memory, since processing happens locally. Most conversions work comfortably with files up to a few hundred megabytes, and image or document conversions handle much more.
Does it work on my phone?
Yes. The converter runs in any modern browser on Windows, macOS, Linux, Android and iOS. No app installation is required.