VOB Won't Open? Convert to ASF Instantly
Fast, instant VOB to ASF conversion. No signup required. Just drop your .vob file and get .asf in seconds.
Batch Settings
About VOB to ASF 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 ASF. ASF is a widely used file format. This conversion lets you convert between formats quickly, solving the problem in seconds rather than hours of troubleshooting.
Converting VOB to ASF maintains high quality with CocoConvert's optimised encoder settings.
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 When you need a ASF 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 ASF
- 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 ASF output
Select .asf 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 .asf file. For batch jobs, download all at once as a zip.
What Happens When You Convert VOB to ASF
Your VOB file is decoded and re-encoded as ASF.
Your VOB file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in ASF format
The converted file is ready for download
Format Comparison
VOB
.vob file
| Extension | .vob |
| MIME Type | video/x-ms-vob |
| Category | Video |
ASF
.asf file
| Extension | .asf |
| MIME Type | video/x-ms-asf |
| Category | Video |
Should You Convert VOB to ASF?
When to Convert
- ✓When you need a ASF 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 ASF — a more widely supported format — usually resolves this. ASF is a widely used file format.
Is it safe to convert VOB to ASF 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 ASF?
Converting VOB to ASF maintains high quality with CocoConvert's optimised encoder settings. 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 ASF 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.