This MP4 to VOB conversion does not run here
VOB is the video format on a DVD, and almost nothing on the web wants it.
Browsers cannot create a DVD VOB file.
What to do instead
Keep the MP4, or convert to MPEG if an old player asks for it. Authoring a real DVD needs desktop software.
The page that does work is mp4-to-mpeg.
MP4 to VOB without the extra promises
MP4 to VOB sits on this site because MP4 and VOB are not interchangeable, even when they look similar in a file list. VOB is the video format on a DVD, and almost nothing on the web wants it. Phones, browsers, Instagram, YouTube, and WhatsApp all expect MP4. People want VOB when they are building a DVD, and MP4 when they want the movie to play.
Browsers cannot create a DVD VOB file.
Read this about MP4 before you upload
MP4 with H.264 video and AAC audio is the safest video file to share in 2026. Soft subtitles such as ASS or PGS, and extra audio languages, are awkward or dropped when a tool re-encodes.
Keep the original MP4. Treat every other container as a compatibility copy.
Read this about VOB before you send the download
The download has to be VOB, because that is the format the next step named. People want VOB when they are building a DVD, and MP4 when they want the movie to play. Playing or re-encoding a VOB you are allowed to use can produce an MP4 or MPEG.
Use MP4 or MPEG for playback. A VOB export is not available here.
Keep, check, then delete
People lose time when they convert before they know which rule failed. Size, pixel dimensions, codec, font encoding, and layout are different rules. MP4 to VOB only addresses the MP4 to VOB step. VOB is the video format on a DVD, and almost nothing on the web wants it. Browsers cannot create a DVD VOB file. Keep the MP4, or convert to MPEG if an old player asks for it. Authoring a real DVD needs desktop software. The file stays on your device. The first run downloads a converter, so keep this tab open. A phone runs out of memory on long files. A computer is the safer place for a big clip. Do the test with a short or simple file first when the real file is large. A one-page PDF, a single photo, or a one-minute clip will show you whether the output is the kind of file you needed. After that test looks right, run the real file once. Keep both the MP4 original and the VOB download until the receiving person or the upload form accepts it. Video files hide the real problem inside the container. MP4 to VOB re-encodes on your device. It does not silently copy every audio language and every subtitle the way a desktop remux can. If you needed those extra tracks, this download is the wrong result even when the picture plays. Convert a one-minute piece before a full movie, and stay on the tab while the converter downloads the first time.
Here is the decision for MP4 to VOB. You start with MP4 and you stop when a real program accepts VOB. If the other person can open only one video format, MP4 is that format. Browsers cannot create a DVD VOB structure. Menus and extra titles are out of scope. If those two sentences describe a tradeoff you do not want, do not convert. Renaming the extension by hand will not do this job. Running the tool twice on its own output will not do it either.
Keep the MP4, or convert to MPEG if an old player asks for it. Authoring a real DVD needs desktop software.
A related step, if you still need one, is AVI to MP4.
Other jobs start from the homepage, where each tool is named for the conversion it actually does.