What Is a VTT File? SRT vs VTT for Video Captions
Learn when to export SRT or VTT for YouTube, Vimeo, HTML video, client handoff, and archives, with syntax and review checks.
A VTT file is a WebVTT subtitle file. Like SRT, it stores caption text with start and end times, but it is built for web video tracks. The practical question is not which format is better in every case. It is which file your publishing channel expects.
What is a VTT file?
VTT stands for Web Video Text Tracks. It is a plain-text format for timed captions, subtitles, chapters, or other text tracks connected to a video. A basic VTT file starts with a WEBVTT header, then lists caption cues with timestamps and text.
The format is designed for HTML video through the track element, which is why it is common on websites, product pages, learning portals, and custom video players. If you need the formal format details, read the MDN WebVTT reference or the W3C WebVTT specification.
Use SRT for broad compatibility
SRT is the plain workhorse format. It is easy to read, easy to edit, and widely accepted by video platforms and editing tools. If a client asks for a subtitle file and gives no extra detail, SRT is often the first format to check.
Use VTT for web video tracks
VTT is short for WebVTT. A VTT file is common in web video workflows because it works with HTML video text tracks. If your team publishes video on a website or product page, VTT may fit better than a burned-in caption export.
Choose by destination
The fastest way to choose is to start with the upload destination. YouTube lists SRT as a basic caption format and WebVTT as an advanced format, so a plain SRT file is usually the simpler first upload there. Vimeo supports both SRT and WebVTT and recommends WebVTT for uploaded caption files. A custom HTML video player should use WebVTT through the track element.
- Use SRT for a simple YouTube upload or a client handoff that only asks for a subtitle file.
- Use VTT for a website, product page, learning portal, or HTML video player.
- Export both when the same reviewed captions need to work across social, web, and archive workflows.
Platform rules change, so check the current help page before a high-stakes upload. YouTube publishes its supported caption file formats, and Vimeo documents its SRT and WebVTT upload support.
What changes inside the file
The caption text can be the same in both exports, but the file syntax is different. SRT uses numbered caption blocks and comma-based timestamps. VTT starts with a WEBVTT header and uses period-based timestamps. That is why the safest workflow is to review one caption source, then export the format the channel asks for.
- SRT timestamp example: 00:00:03,456
- VTT timestamp example: 00:00:03.456
- VTT can also carry optional cue settings for web-player display.
Do not just rename the file
Changing .srt to .vtt in the filename does not make a valid WebVTT file. A real VTT export needs the WEBVTT header and period-based timestamps. If you need the other format, convert the file or export it again from the reviewed caption source.
If you already have an SRT file and only need WebVTT syntax, use the SRT to VTT converter. If you still need to generate captions from a video, start with the main caption workflow instead.
Keep the caption text source editable
Do not treat SRT or VTT as the first draft. Generate or transcribe the captions, review the words and timing, then export the files. That order matters because a typo in the source track becomes a typo in every format you download from it.
When to export both
Export both when the same video will live in more than one place. A team might use SRT for a platform upload, VTT for a website, and a styled captioned video for social. Keeping the same reviewed caption text behind each output keeps the work consistent.
A quick choice before export
Choose SRT when the platform asks for a simple subtitle file or when a client has not named a format. Choose VTT when the video will play on a website through a web video track. Export both when the same reviewed captions need to move across social, web, and archive workflows.
AutoCaption supports SRT and VTT exports from the caption workflow. Upload a clip in AutoCaption, review the timed text, and download the file your channel needs.
Quick answers
What is a VTT file?
A VTT file is a WebVTT subtitle file used for timed text tracks in web video players. It starts with a WEBVTT header, uses period-based timestamps, and can use the same reviewed caption text as an SRT export.
Should I export SRT or VTT?
Use SRT when you need a simple subtitle file for broad platform or client compatibility. Use VTT when the video will use a web video track. Export both when the same reviewed captions need to work across more than one channel.
Do SRT and VTT files use the same caption text?
They can use the same reviewed caption text, but the file formats are different. Review the source captions first, then export the format your publishing channel expects.
Can AutoCaption export SRT and VTT files?
Yes. AutoCaption supports SRT and VTT exports from the caption workflow after you generate and review the timed text.
Can I rename an SRT file to VTT?
No. A VTT file needs WebVTT syntax, including a WEBVTT header and period-based timestamps. Convert the file or export VTT again from the reviewed caption source.