How to convert SRT to VTT for HTML5 video

If your subtitles started as SRT and the destination is an HTML5 video player, VTT is usually the correct final format.

Quick answer

Use SRT while collecting or exchanging subtitle files, then convert the final delivery file to VTT before browser playback.

That conversion mainly does three things:

• adds the WEBVTT header
• switches timestamp commas to dots
• removes SRT cue numbering

Why HTML5 video usually wants VTT

Most browser-based players expect WebVTT because it is the web-native caption format. That includes:

• plain HTML5 <track> playback
• custom video components
• many JavaScript player libraries

SRT may still work in some workflows, but VTT is the safer default when captions are meant to render inside a browser.

Step-by-step workflow

1. Start with a clean .srt file.
2. Open the SRT to VTT Converter.
3. Paste the file or upload it directly.
4. Review the output and confirm the WEBVTT header is present.
5. Download the converted .vtt file.
6. Test the result in the target player before shipping it.

Common mistakes

Uploading SRT directly into a browser workflow

Some players or components are strict about VTT formatting. If captions do not render, wrong file format is one of the first things to check.

Forgetting the header

VTT files need a WEBVTT header. A file that looks close to VTT but lacks that first line can still fail.

Keeping commas in timestamps

SRT uses commas in timestamps. VTT uses dots. If those timestamps are not normalized, browser playback can reject the file.

When not to convert

Keep the original SRT if:

• a client specifically asked for SRT
• you are archiving a delivery file that already works
• the next tool in the workflow only supports SRT

In that case, treat VTT as the playback export rather than the only master file.

Related guides

• Best subtitle format for HTML5 video
• SRT vs VTT
• How to convert subtitle files for web players