VTT vs SUB — Comparison & Free Converter
Fast, instant VTT (WEBVTT) to SUB (MICRODVD) conversion. No signup required. Just drop your .vtt file and get .sub in seconds.
Batch Settings
字幕文件格式众多，VTT和SUB是其中常见的两种。VTT（WebVTT）因其对网络视频的支持和时间戳的精确性，常用于在线播放平台。而SUB格式，尤其是MicroDVD SUB，则因其简洁和对播放器兼容性好，在本地视频文件和一些老牌播放软件中仍占有一席之地。当您需要将在线视频字幕适配到本地播放器，或者为了在特定设备（如某些旧款电视或掌上游戏机）上更好地显示字幕时，VTT转SUB就显得尤为重要。我们深知转换过程中保持时间轴准确和文本完整的重要性，因此提供了高效稳定的转换服务，确保您的字幕无缝衔接，让观影或游戏体验不受影响。
- 微信分享自制短片
- Switch游戏录像剪辑
- 老旧DVD播放器适配
在大陆和台湾地区，SUB格式有时特指基于帧率而非时间码的MicroDVD SUB，在处理这类转换时需特别注意帧率匹配，以避免字幕错位。
About VTT (WEBVTT) to SUB (MICRODVD) Conversion
VTT or SUB — which format should you use? The answer depends on your needs. Here's a quick breakdown.
VTT (WebVTT) is the web-standard subtitle format used in HTML5 video players. It has mostly universal platform support. SUB is a widely used file format. It has common platform support.
So when should you convert VTT to SUB? This conversion is ideal when you When you need a SUB file. This conversion helps you convert between formats quickly.
Converting VTT to SUB maintains high quality with CocoConvert's optimised encoder settings.
If you've decided SUB is the right choice, CocoConvert makes the conversion effortless. Upload your .vtt file, pick SUB, and click Convert — done in seconds. The converter runs on secure servers in Germany, powered by FFmpeg, Sharp, and qpdf. Files are encrypted via TLS and erased within 24 hours.
Free tier: 5 files/hour, 250 MB each. Pro: 100 files/hour, 5 GB each. Works in every modern browser on desktop and mobile.
How to Convert VTT (WEBVTT) to SUB (MICRODVD)
- 1
Choose your VTT file
Upload your .vtt file using drag-and-drop or the file browser. Batch mode lets you add multiple files.
- 2
Set format to SUB
Select .sub from the output options. The converter applies optimal quality settings automatically.
- 3
Run the conversion
Click Convert. Server-side processing means your device stays fast — even for large subtitle / caption files.
- 4
Get your SUB file
Download your converted file instantly. Batch downloads are available as a zip archive.
What Happens When You Convert VTT (WEBVTT) to SUB (MICRODVD)
Your VTT file is decoded and re-encoded as SUB.
Your VTT file is uploaded and validated
The file is decoded (parsed into its raw data)
The data is re-encoded in SUB format
The converted file is ready for download
Format Comparison
VTT (WebVTT)
.vtt file
| Extension | .vtt |
| MIME Type | text/vtt |
| Category | Subtitle / Caption |
SUB (MicroDVD)
.sub file
| Extension | .sub |
| MIME Type | text/x-sub |
| Category | Subtitle / Caption |
Should You Convert VTT (WEBVTT) to SUB (MICRODVD)?
When to Convert
- ✓When you need a SUB file
Frequently Asked Questions
Should I use VTT or SUB?
It depends on your goal. VTT preserves full quality. SUB preserves full quality. Choose based on whether file size or quality matters more for your use case.
Is SUB higher quality than VTT?
Not necessarily. Converting VTT to SUB maintains high quality with CocoConvert's optimised encoder settings. Quality depends on the compression type and settings, not just the format name.
Can I convert VTT to SUB on Mac and Windows?
Yes. CocoConvert is a web-based tool that works in all modern browsers — Chrome, Safari, Firefox, Edge — on any operating system including macOS, Windows, Linux, iOS, and Android.
Is CocoConvert free for VTT to SUB?
Yes. Free users get 5 conversions per hour (250 MB each). Pro subscribers unlock 100 files per hour, 5 GB per file, and priority processing.
What tools does CocoConvert use for VTT to SUB?
CocoConvert uses FFmpeg for audio/video, Sharp for images, and qpdf for documents — the same open-source libraries used by Netflix, YouTube, and major enterprise platforms.