Video
What is a VOB file?
Updated Jul 2026
A VOB (DVD Video Object) file is the container format DVDs use to store video, audio, subtitles, and menus. It holds the movie without recompressing it, so quality stays exactly as authored on the disc. The catch is that VOB files are large, often split into chunks, and most modern phones, laptops, and streaming apps won't play them directly.
- Extension
- .vob
- Type
- Video
- Typically
- DVDs
Why VOB exists
VOB is part of the DVD-Video standard from the 1990s. Pop open a DVD's file structure and you'll find a VIDEO_TS folder full of .VOB files, usually named things like VTS_01_1.VOB through VTS_01_4.VOB. Each one is a chunk of the disc's video, audio tracks, subtitle streams, and menu data, all bundled into a single container.
The reason DVDs split a movie into multiple VOB files is a legacy limit: early DVD file systems capped individual files at about a gigabyte, so a two-hour film gets broken into several pieces that play back to back. Inside, the video itself is MPEG-2, the same compression used for broadcast TV at the time, which is why quality is solid but the files are large for what they show.
People run into VOB files today mostly when ripping an old home movie DVD or digging up disc backups, since the format itself isn't lossy or damaged, it's just tied to physical discs and old players. A phone, tablet, or modern media app typically expects MP4 or MKV, so the VOB files need converting before they'll play anywhere but a DVD player or an older desktop program.
The trade-offs
Strengths
- Preserves the DVD's original video and audio without recompressing it
- Keeps subtitle tracks and multiple audio languages intact
- Straightforward to pull directly off a DVD's file structure
Watch-outs
- Large file sizes for the video quality they contain
- Long videos are split across several separate .VOB files
- Barely supported outside DVD players and older desktop software
- Commercial DVDs often add copy protection that blocks copying the files
A note on privacy
A VOB file itself carries little personal metadata beyond what was authored onto the disc, but the footage inside is often a home movie or personal recording you'd rather not hand to a stranger's server. Uploading it to an online converter means that video sits on someone else's system, even temporarily. Converting on your own machine keeps the file, and whatever it shows, entirely on your computer.
Questions
How do I open a VOB file?
Some desktop media players will open a VOB directly, but many phones, tablets, and streaming apps won't. Converting it to MP4 is the more reliable way to get it playing everywhere.
Is VOB better than MP4?
For raw quality off a DVD, VOB preserves what's on the disc without recompressing it. For everything else, MP4 wins: smaller files, far wider support, and it plays on essentially every modern device.
Why does my DVD have multiple VOB files instead of one?
Old DVD file systems capped individual files at around a gigabyte, so longer videos get split into several VOB chunks that play in sequence.
Can I convert a VOB file without uploading it?
Yes. A desktop app like Morphjet converts VOB files on your own computer, so the footage never has to leave your machine.
Why won't my VOB file play on my phone?
Phones generally don't support the VOB container at all. You'll need to convert it to MP4 or a similar format the device actually recognizes.
Morphjet opens and converts VOB and 1,800+ other formats, all on your own computer. Launching this July.