WMA to MP4 Converter
Processing entirely on your device — large files may take a moment.
Windows Media Audio and MPEG-4 Video exist for different jobs: WMA is Microsoft’s Windows Media audio format, still found in old music collections and voice recorders. Convert to MP4 when a video must play everywhere — it is the one format you never have to worry about.
This converter runs entirely in your browser using WebAssembly — your files never leave your device, nothing is uploaded, and there are no watermarks, sign-ups or queues. Drop in several files at once to convert them as a batch.
How WMA compares to MP4
| WMA | MP4 | |
|---|---|---|
| Compression | Lossy + Lossless variants | H.264 / HEVC / AV1 + AAC |
| Quality | Respectable for its era | Depends on encode settings |
| Compatibility | Windows-centric | Plays everywhere |
| Best for | Legacy Windows libraries | Distribution, web, storage |
How to convert WMA to MP4
- 1
Select your files
Select your WMA audio file.
- 2
Convert instantly
The engine draws the waveform and syncs it as a video frame to the original audio.
- 3
Download results
Download the MP4 — upload-ready for YouTube or Bilibili.
About the WMA format
WMA (Windows Media Audio) is Microsoft's MP3 competitor from 1999, best known for DRM-protected download stores in the 2000s. The family spans standard lossy WMA, WMA Pro (up to 24-bit/96 kHz) and WMA Lossless. On Windows it integrated seamlessly; everywhere else it required goodwill.
With Microsoft's own services having moved to AAC, WMA today is a conversion source: old music libraries and ripped CDs get converted to MP3/M4A/FLAC and the format is retired. WMA Lossless files should go to FLAC to preserve their losslessness.
+ Strengths
- ✓Native Windows playback and tagging
- ✓WMA Lossless preserves bit-perfect audio
! Limitations
- −Non-Windows support is poor
- −Ecosystem abandoned by its creator
- −DRM-legacy files may be unplayable
About the MP4 format
MP4 (MPEG-4 Part 14) is the universal delivery container of digital video. It wraps H.264, HEVC or AV1 video with AAC audio, and its structure — separate metadata (moov) and media atoms — is what makes streaming, seeking and fast-start playback possible. Phones, cameras, TVs, browsers and every social platform assume MP4 first.
Quality is entirely a function of the codec and bitrate chosen at encode time, so an MP4 can be a 10 Mbps HEVC master or a postage stamp. That flexibility plus total playback coverage is why nothing has displaced it in twenty years — conversion between formats almost always ends in MP4.
+ Strengths
- ✓Plays on every device and platform in existence
- ✓Streaming-ready structure (fast start, seeking)
- ✓Choice of modern codecs: H.264, HEVC, AV1
! Limitations
- −Quality depends entirely on encode settings
- −HEVC variants hit licensing gaps on some platforms
Why convert WMA to MP4?
Think of it as moving your file to the container that fits the job. Non-Windows support is poor MP4 works differently: Plays on every device and platform in existence If any of that sounds like your task, run the conversion — it takes seconds and nothing leaves your device.
Frequently asked questions
Is this WMA to MP4 converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Is there a file size limit for WMA to MP4?
The only limit is your device's memory, since nothing is uploaded. Files up to a few hundred megabytes work fine on a modern desktop browser; very large files simply take a little longer.
Are tags like title and artist preserved?
Tag handling varies between target formats and this conversion focuses on the audio itself. For archival copies where tags matter, keep the original file; the converted copy is for playback and sharing.
Can I convert a whole folder of WMA files?
You can select many files at once and they are processed in a single batch. Output files land in one ZIP download when there is more than one result.