About converting MP4 to MP3
Use this free MP4 to MP3 converter to change MP4 videos into MP3 without uploading anything, installing software or signing up. MP4 with H.264 is the most broadly supported video container in existence, playing natively in every browser, phone, TV and editor without extra codecs. MP3 is the universally compatible lossy audio codec - not the most efficient one any more, but the one that plays on absolutely every device ever built.
Extracting the MP3 audio track out of a MP4 is how you turn a recorded talk, interview, lecture or music video into something listenable in the background - and the resulting file is a fraction of the original size.
Because every conversion runs on your own device through WebAssembly builds of the same open-source engines desktop tools use, there is no upload queue, no file-size cap imposed by a server, and no copy of your MP4 sitting in someone else's storage afterwards. That matters most for anything you would hesitate to hand to a third party - identity documents, contracts, medical scans, unreleased work, client material. It also means the converter keeps working with no network connection at all once the page has loaded.
MP4 to MP3 is one of many routes available here. If a direct path between two formats does not exist, the converter automatically chains several conversions together to reach the one you asked for, so you can get from almost any input to almost any output in a single step.
How to convert MP4 to MP3
- Drop your MP4 file onto the area above, or click it to browse for one.
- Confirm that "Convert from:" reads MP4 - it is detected from your file automatically.
- Check that "Convert to:" is set to MP3. It is already pre-selected on this page.
- Press Convert, then save the converted audio file when it is ready.
Frequently asked questions
- Is this MP4 to MP3 converter free?
- Yes, completely. There is no charge, no account, no watermark on the output and no daily conversion limit.
- Are my files uploaded to a server?
- No. The conversion runs in your browser using WebAssembly, so your MP4 file never leaves your device and nothing is stored anywhere after you close the tab.
- Is there a file size limit for MP4 to MP3 conversion?
- There is no server-imposed limit, because there is no server involved. The practical ceiling is your own device's available memory, so very large files convert faster on a desktop than on a phone.
- Will the MP3 output look the same as the MP4 original?
- It depends on the target format. MP3 output is produced at high quality settings, but converting into a lossy format always discards some data by design, and re-encoding an already-lossy file compounds that. Convert from the highest-quality source you have rather than from a previously converted copy.
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