VOB Won't Open? Convert to MKV Instantly
Fast, instant VOB to MKV conversion. No signup required. Just drop your .vob file and get .mkv in seconds.
Batch Settings
Generation loss — quality may degrade
VOB 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 VOB file may contain DVD IFO data 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DVDコレクション、特にあの限定版アニメや特撮シリーズを、もっと手軽に、そして高画質で楽しみたいと思いませんか？ VOB形式はDVDの標準ですが、現代の多様なデバイスやメディアプレイヤーでの再生には少々不便を感じることも。そこで、VOBファイルを汎用性の高いMKV形式へ変換する出番です。MKVは複数の音声トラックや字幕、チャプター情報などを一つにまとめられるため、まるでディスクをそのままデジタル化したかのような体験を提供します。この変換によって、大切な映像資産を未来へと継承し、いつでもどこでも、お好みの環境で鑑賞できるようになります。手元のVOBファイルをMKVにすることで、より自由で快適なデジタルライフが待っています。
- 限定版アニメDVDのデジタル保存
- ビジネスプレゼン用映像の汎用化
- 同人作品の複数音声・字幕対応
日本のアニメや特撮作品には、本編以外に特典映像やオーディオコメンタリーがVOB形式で収録されていることが多いため、MKVへの変換はこれらの付加価値を損なわずにデジタルアーカイブする上で特に有効です。
About VOB to MKV Conversion
Dealing with a VOB file that won't open on your device? You're not alone — VOB compatibility issues are one of the most common reasons people search for a file converter. VOB is the DVD video format containing MPEG-2 streams, audio, subtitles, and menus.
The fix is simple: convert your VOB to MKV. MKV (Matroska) is an open container supporting virtually any codec, multiple audio tracks, and subtitles. This conversion lets you improve file compatibility across devices, solving the problem in seconds rather than hours of troubleshooting.
Full Name: VOB uses DVD Video Object, while MKV uses Matroska Video. Compression: VOB uses Lossy, while MKV uses Lossy. Color Depth: VOB uses 8-bit, while MKV uses 8–10 bits (codec dependent). VOB 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.
CocoConvert processes your VOB 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 VOB 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. Common misconception: ""I'll convert to MKV and then back to VOB — it'll be the same"" — in reality, each lossy conversion cycle permanently degrades quality. going vob → mkv → vob 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 VOB to MKV
- 1
Add your VOB file
Drag and drop your .vob file into the converter, or tap "Browse" to pick it from your device. Multiple files are supported for batch processing.
- 2
Pick MKV output
Select .mkv as the target format. CocoConvert automatically applies the best quality settings for this conversion.
- 3
Start conversion
Hit the Convert button. The video engine processes your file server-side — no CPU drain on your device.
- 4
Save your file
Once done, download your .mkv file. For batch jobs, download all at once as a zip.
What Happens When You Convert VOB to MKV
Your VOB video is transcoded — video and audio streams are decoded and re-encoded into the MKV container. This is a lossy process that takes time proportional to the video duration.
Your VOB file is demuxed — video, audio, and subtitle streams are separated
The video stream is decoded frame-by-frame, then re-encoded with MKV-compatible codecs (typically H.264 for MP4)
The audio stream is decoded and re-encoded (or copied if the codec is compatible)
Subtitle and chapter data is preserved where the target supports it
Streams are muxed into the MKV container and the file is saved
VOB vs MKV — Detailed Comparison
| Feature | .VOB | .MKV |
|---|---|---|
| Full Name | DVD Video Object | Matroska Video |
| Compression | Lossy | Lossy |
| Color Depth | 8-bit | 8–10 bits (codec dependent) |
| HDR Support | No | Yes |
| Typical File Size | 200–400 MB per minute (DVD quality) | 50–200 MB per minute |
| Platform Support | Limited | Very Wide |
| Browser Support | none | Limited |
| Year Created | 1996 | 2002 |
| Open Standard | No | Yes |
Should You Convert VOB to MKV?
When to Convert
- ✓Your VOB file won't open on a recipient's device or in an application
- ✓A website, service, or platform only accepts MKV uploads
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 VOB to MKV
"I'll convert to MKV and then back to VOB — it'll be the same"
Each lossy conversion cycle permanently degrades quality. Going VOB → MKV → VOB will produce a noticeably worse file than the original. Always keep your source file.
Frequently Asked Questions
Why won't my VOB file open?
VOB files may not open if your device lacks the right codec or application. Converting to MKV — a more widely supported format — usually resolves this. MKV (Matroska) is an open container supporting virtually any codec, multiple audio tracks, and subtitles.
Is it safe to convert VOB to MKV 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 VOB to MKV?
VOB 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. CocoConvert uses high-quality encoder defaults to preserve as much fidelity as possible.
How large can my VOB 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 VOB to MKV 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.