Free online VOB to WEBM converter

Source format overview

VOB is a video container format used on DVD-Video discs. It typically stores MPEG-2 video, AC-3 or DTS audio, subtitles, and navigation data in files such as VIDEO_TS.VOB. VOB files are commonly used by DVD authoring systems, disc rippers, and media players that can read DVD structures. They are well suited for physical disc playback, but they are not ideal for modern web delivery or compact storage.

Target format overview

WebM is a modern open media container designed for the web. It usually contains VP8 or VP9 video with Opus or Vorbis audio. WebM is widely supported by browsers and many streaming platforms, and it offers efficient compression, good quality at smaller file sizes, and royalty-free codecs. It is a strong choice for online playback, HTML5 video, and sharing video files in a web-friendly format.

How to perform the conversion

The most reliable method is to use FFmpeg, which can read VOB files directly and encode them to WebM. If your VOB comes from a DVD, make sure you convert the correct title or file segment, since DVDs often split content across multiple VOB files.

Basic conversion example:

ffmpeg -i input.vob -c:v libvpx-vp9 -crf 32 -b:v 0 -c:a libopus output.webm

This command converts the video to VP9 and the audio to Opus. For faster encoding, you can use VP8 instead:

ffmpeg -i input.vob -c:v libvpx -crf 10 -b:v 0 -c:a libvorbis output.webm

If you prefer a graphical workflow, use a desktop converter or editor that supports export to WebM. Open the VOB file, then choose File → Export or File → Save as, select WebM as the output format, and start the export. On 101convert.com, you can convert the file online for free without installing any software.

Notes on quality and compatibility

VOB to WebM is a re-encoding conversion, not a simple container swap, because the source and target formats use different codecs. That means some quality loss is possible, especially if the VOB is already compressed or interlaced. For best results, use a high-quality source and choose a sensible CRF value: lower values preserve more quality but create larger files.

DVD video is often interlaced, while WebM playback is usually best with progressive video. If the source looks combed or jagged, deinterlacing may be needed during conversion. Also note that some DVD VOB files contain multiple audio tracks, subtitles, or chapter navigation; not all of these features transfer cleanly to WebM. Browser support for WebM is excellent in modern environments, but older devices and legacy players may not support it.