WMA to MKV — Format Comparison & Online Converter
Fast, instant WMA to MKV conversion. No signup required. Just drop your .wma file and get .mkv in seconds.
Batch Settings
Generation loss — quality may degrade
WMA uses lossy compression, and so does MKV. 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. MKV 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
MKV lossy compression can produce codec-dependent. 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.
お気に入りのオーディオコンテンツを、より汎用性の高い動画フォーマットで楽しみたいとお考えですか？WMA形式の音声ファイルを、高画質な動画コンテナであるMKVへ変換するお手伝いをいたします。WMAはかつて広く利用されましたが、今日では対応デバイスや再生環境が限られることも少なくありません。一方、MKVは複数の音声トラックや字幕、チャプター情報などを柔軟に内包できるため、メディア管理において非常に便利なフォーマットです。この変換サービスをご利用いただくことで、過去のライブラリ資産を現代の多様な視聴環境に適合させ、より豊かなデジタルライフを実現します。手間なく、迅速に、そして品質を損なうことなく、大切なコンテンツを新しい形でお楽しみください。
- アニメの音声特典を映像と統合
- ビジネス会議録のアーカイブ化
- 朗読コンテンツの視覚的付加
日本国内では、特にアニメやドラマの特典音声がWMA形式で配布されることが過去にあり、これらをMKVに変換することで、PCだけでなく様々なメディアプレイヤーでの視聴互換性が向上します。
About WMA to MKV Conversion
WMA (introduced 1999) and MKV (introduced 2002) are both audio formats, but they differ in important ways. WMA (Windows Media Audio) is Microsoft's audio codec — less common today but still found in legacy collections. MKV (Matroska) is an open container supporting virtually any codec, multiple audio tracks, and subtitles.
Full Name: WMA uses Windows Media Audio, while MKV uses Matroska Video. Compression: WMA uses Lossy, while MKV uses Lossy. Color Depth: WMA uses —, while MKV uses 8–10 bits (codec dependent).
When you convert WMA to MKV, the goal is to improve file compatibility across devices. WMA uses lossy compression, and so does MKV. Converting means decoding and re-encoding — each cycle can permanently degrade quality. Convert from the original source file whenever possible. Understanding these technical differences helps you choose the right format for your workflow.
Your WMA file is decoded and re-encoded as MKV. The conversion involves 4 steps: (1) your wma file is uploaded and the format is validated, (2) the file content is decoded into its raw representation, (3) the data is re-encoded in mkv format with optimal settings, (4) the converted file is ready for download.
CocoConvert's converter handles the entire pipeline server-side using FFmpeg, Sharp, and qpdf — battle-tested libraries used by streaming platforms and enterprise tools. Files are encrypted in transit and deleted within 24 hours.
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 MKV uploads. For the opposite direction, CocoConvert also supports MKV to WMA conversion.
How to Convert WMA to MKV
- 1
Upload .wma file
Select your WMA file by dragging it to the upload zone or using the file picker. Batch upload is available for multiple files.
- 2
Choose .mkv
Set MKV as the output format. The converter uses optimal settings based on the WMA→MKV conversion profile.
- 3
Convert
The server-side engine decodes your WMA file and re-encodes it as MKV. Processing time depends on file size and complexity.
- 4
Download result
Grab your converted .mkv file. Multiple output files can be downloaded together.
What Happens When You Convert WMA to MKV
Your WMA file is decoded and re-encoded as MKV.
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 MKV format with optimal settings
The converted file is ready for download
WMA vs MKV — Detailed Comparison
| Feature | .WMA | .MKV |
|---|---|---|
| Full Name | Windows Media Audio | Matroska Video |
| Compression | Lossy | Lossy |
| Color Depth | — | 8–10 bits (codec dependent) |
| HDR Support | — | Yes |
| Typical File Size | 1 MB per minute at 128 kbps | 50–200 MB per minute |
| Platform Support | Limited | Very Wide |
| Browser Support | none | Limited |
| Year Created | 1999 | 2002 |
| Open Standard | No | Yes |
Should You Convert WMA to MKV?
When to Convert
- ✓You need just the audio track from a video recording
- ✓You're creating a podcast or audio file from video content
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 MKV
"I'll convert to MKV and then back to WMA — it'll be the same"
Each lossy conversion cycle permanently degrades quality. Going WMA → MKV → WMA will produce a noticeably worse file than the original. Always keep your source file.
Frequently Asked Questions
What is the difference between WMA and MKV?
WMA (Windows Media Audio) is Microsoft's audio codec — less common today but still found in legacy collections. MKV (Matroska) is an open container supporting virtually any codec, multiple audio tracks, and subtitles. Full Name: WMA uses Windows Media Audio, while MKV uses Matroska Video. Compression: WMA uses Lossy, while MKV uses Lossy. Color Depth: WMA uses —, while MKV uses 8–10 bits (codec dependent).
Does WMA to MKV conversion affect quality?
WMA uses lossy compression, and so does MKV. Converting means decoding and re-encoding — each cycle can permanently degrade quality. Convert from the original source file whenever possible.
Which format has better compression, WMA or MKV?
WMA uses lossy compression. MKV uses lossy compression. The better choice depends on whether you prioritize file size or quality.
How long does WMA to MKV conversion take?
Most conversions finish in seconds. Larger files or complex audio content may take 10–30 seconds. CocoConvert processes files in parallel for batch jobs.
Is WMA or MKV better for long-term storage?
Both formats use lossy compression, so consider keeping your original source file for long-term storage.
Versions are pinned in our worker Dockerfile and re-built via CI on every change.