WMA Won't Open? Convert to MP4 Instantly
Fast, instant WMA to MP4 conversion. No signup required. Just drop your .wma file and get .mp4 in seconds.
Batch Settings
Generation loss — quality may degrade
WMA uses lossy compression, and so does MP4. Converting means decoding and re-encoding — each cycle can permanently degrade quality. Convert from the original source file whenever possible.
Some metadata may not survive
Your WMA file may contain ASF metadata, DRM tags metadata. MP4 has limited or no support for these metadata types. Location data (GPS), camera settings, and color profiles may be stripped during conversion.
What compression artifacts to expect
MP4 lossy compression can produce blockiness, banding in gradients, mosquito noise. At the high quality settings CocoConvert uses by default, these are usually invisible to the eye. Lower quality settings trade visual fidelity for smaller file sizes.
About WMA to MP4 Conversion
Dealing with a WMA file that won't open on your device? You're not alone — WMA compatibility issues are one of the most common reasons people search for a file converter. WMA (Windows Media Audio) is Microsoft's audio codec — less common today but still found in legacy collections.
The fix is simple: convert your WMA to MP4. MP4 (MPEG-4 Part 14) is the universal video container supporting H.264/H.265 codecs — plays on virtually every device. This conversion lets you improve file compatibility across devices, solving the problem in seconds rather than hours of troubleshooting.
Full Name: WMA uses Windows Media Audio, while MP4 uses MPEG-4 Part 14. Compression: WMA uses Lossy, while MP4 uses Lossy. Color Depth: WMA uses —, while MP4 uses 8-bit (H.264) or 10-bit (H.265/AV1). WMA uses lossy compression, and so does MP4. Converting means decoding and re-encoding — each cycle can permanently degrade quality. Convert from the original source file whenever possible.
CocoConvert processes your WMA file on secure servers in Germany — upload, convert, download. Your files are encrypted via TLS and automatically deleted within 24 hours. No account needed, no software to install, and it works on any device with a browser.
This conversion is ideal when you Your WMA file won't open on a recipient's device or in an application, or when you A website, service, or platform only accepts MP4 uploads. Common misconception: ""I'll convert to MP4 and then back to WMA — it'll be the same"" — in reality, each lossy conversion cycle permanently degrades quality. going wma → mp4 → wma will produce a noticeably worse file than the original. always keep your source file.
The conversion engine behind CocoConvert uses FFmpeg, Sharp, and qpdf — the same open-source libraries trusted by Netflix, YouTube, and enterprise platforms. Pro users can batch convert up to 100 files at once.
How to Convert WMA to MP4
- 1
Add your WMA file
Drag and drop your .wma file into the converter, or tap "Browse" to pick it from your device. Multiple files are supported for batch processing.
- 2
Pick MP4 output
Select .mp4 as the target format. CocoConvert automatically applies the best quality settings for this conversion.
- 3
Start conversion
Hit the Convert button. The audio engine processes your file server-side — no CPU drain on your device.
- 4
Save your file
Once done, download your .mp4 file. For batch jobs, download all at once as a zip.
What Happens When You Convert WMA to MP4
Your WMA file is decoded and re-encoded as MP4.
Your WMA file is uploaded and the format is validated
The file content is decoded into its raw representation
The data is re-encoded in MP4 format with optimal settings
The converted file is ready for download
WMA vs MP4 — Detailed Comparison
| Feature | .WMA | .MP4 |
|---|---|---|
| Full Name | Windows Media Audio | MPEG-4 Part 14 |
| Compression | Lossy | Lossy |
| Color Depth | — | 8-bit (H.264) or 10-bit (H.265/AV1) |
| HDR Support | — | Yes |
| Typical File Size | 1 MB per minute at 128 kbps | 50–200 MB per minute (1080p H.264) |
| Platform Support | Limited | Universal |
| Browser Support | none | Universal |
| Year Created | 1999 | 2001 |
| Open Standard | No | Yes |
Should You Convert WMA to MP4?
When to Convert
- ✓You need just the audio track from a video recording
- ✓You're creating a podcast or audio file from video content
- ✓You need a file that works in web browsers
- ✓You need maximum device and software compatibility
When NOT to Convert
- ✗You're converting just because the file "seems old" — re-encoding lossy-to-lossy always degrades quality
Common Mistakes When Converting WMA to MP4
"I'll convert to MP4 and then back to WMA — it'll be the same"
Each lossy conversion cycle permanently degrades quality. Going WMA → MP4 → WMA will produce a noticeably worse file than the original. Always keep your source file.
Frequently Asked Questions
Why won't my WMA file open?
WMA files may not open if your device lacks the right codec or application. Converting to MP4 — a more widely supported format — usually resolves this. MP4 (MPEG-4 Part 14) is the universal video container supporting H.264/H.265 codecs — plays on virtually every device.
Is it safe to convert WMA to MP4 online?
Yes. CocoConvert encrypts your file via TLS, processes it on isolated servers in Germany, and permanently deletes it within 24 hours. Your files are never shared or analysed.
Will I lose quality converting WMA to MP4?
WMA uses lossy compression, and so does MP4. Converting means decoding and re-encoding — each cycle can permanently degrade quality. Convert from the original source file whenever possible. CocoConvert uses high-quality encoder defaults to preserve as much fidelity as possible.
How large can my WMA file be?
Free users can convert files up to 250 MB each. Pro users get a 5 GB limit per file, and Business API users have custom limits.
Can I convert WMA to MP4 on my phone?
Absolutely. CocoConvert works in any modern browser — iOS Safari, Android Chrome, and all desktop browsers. No app required.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.