How to convert VOB to ASF
To convert VOB to ASF, upload your VOB file, choose ASF as the output format and press Convert. The finished ASF file is ready to save to your phone or computer in seconds, free, with no watermark and no sign-up. Your file is deleted from our server about 30 minutes after the conversion.
This free online converter turns VOB videos into ASF files in your browser, with no software to install and no watermark. When the video and audio inside your VOB file can be placed in ASF as they are, the streams are copied without re-encoding, which is faster and keeps the original quality. Otherwise the video is re-encoded as Windows Media Video 8 with Windows Media Audio 2.
Why convert VOB to ASF?
- Built for streaming over networks
- Plays in Windows Media Player
- Can hold multiple tracks and metadata
- Plays on: Windows Media Player, VLC and legacy Windows tools
What to expect from this conversion
- Expect a smaller file than the VOB original, because ASF compresses more efficiently.
- ASF output uses Windows Media Video 8 and Windows Media Audio 2, the same streams WMV files carry.
- VOB files from commercial DVDs are usually copy-protected and cannot be converted here. Files from your own home DVDs work fine.
- The first audio track is kept. Subtitle tracks, extra audio tracks and chapters are not included in the converted file.
VOB vs ASF
| Property | VOB | ASF |
|---|---|---|
| Full name | DVD Video Object | Advanced Systems Format |
| Released | 1996, DVD Forum | 1999, Microsoft |
| Generation | Legacy | Legacy |
| Typical file size | Large | Medium |
| Plays on | DVD players, VLC, Windows Media Player and most media centers | Windows Media Player, VLC and legacy Windows tools |
| Best for | converting your own home DVDs; DVD authoring | legacy Windows streaming; old media servers |
Steps to convert VOB to ASF
- Drop your VOB video file onto the converter, or click to choose it.
- Check that ASF is selected as the target and adjust the options if you want.
- Press Convert, then download your new ASF file when it finishes.
Tips for the best result
- Leave Fast mode on to keep the original quality whenever the streams can be copied.
- Pick a lower resolution if the file is for a phone or messaging app.
- Use Mute if you only need the picture.
Frequently asked questions
How do I convert VOB to ASF?
Upload your VOB file, make sure ASF is the selected target and press Convert. When the progress bar finishes, download the ASF file. No account or software is needed.
Is the VOB to ASF converter free?
Yes. It is free, with no watermark, no sign-up and no daily limit on how many files you convert. The site is supported by ads.
Will I lose quality when converting VOB to ASF?
Not necessarily. If the video and audio streams already fit inside ASF, they are copied without re-encoding, so quality stays identical. If the file has to be re-encoded, the High setting keeps almost all visible detail, while Small trades some detail for a smaller file.
Why is my ASF file smaller than the VOB original?
Expect a smaller file than the VOB original, because ASF compresses more efficiently. Choosing a lower quality or resolution reduces the size further.
Which devices can play ASF files?
ASF files play on Windows Media Player, VLC and legacy Windows tools.
How large a file can I upload?
You can upload videos up to 500 MB. Files are deleted from the server about 30 minutes after conversion.