Timestamp syntax
SRT commas become WebVTT periods while the start and end times stay in place.
SRT to WebVTT converter
SRT to VTT converter for video captions.
Paste an SRT subtitle file or upload one from your computer. AutoCaption converts the cue timing into WebVTT format so you can copy or download a .vtt file for web video, client handoff, or caption QA.
Browser subtitle converter
Convert SRT captions to WebVTT.
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Conversion happens in your browser. This page changes subtitle file formatting only. Use the caption generator if you need to create captions from a video.
When a VTT file is the right export
WebVTT is the caption format used by HTML video text tracks. If a web player, documentation site, learning platform, or product page asks for a .vtt file, convert the SRT file before uploading it.
The important difference is syntax. SRT commonly uses comma-based milliseconds, while WebVTT uses periods and starts with a WEBVTT header. This converter handles that formatting change and keeps the caption text visible for review.
To create a caption file from a video instead of converting an existing subtitle file, start with the AutoCaption caption generator. If you are starting with a WebVTT file and need an SRT file instead, use the VTT to SRT converter. If the caption text needs translation, use the video subtitle translator. If the cues are out of sync with the video, correct that first with the subtitle timing shifter, and to pull the words out as a readable transcript use the SRT to text converter. For format choice guidance, read the SRT vs VTT guide.
SRT to VTT conversion checks
Cue text
Caption text is preserved inside each cue block so you can review it before download.
Browser workflow
The converter reads local text in the page and gives you a copy or download action.
SRT to VTT questions
What does this SRT to VTT converter do?
It changes an SRT subtitle file into a WebVTT file by adding the WEBVTT header, converting comma-based milliseconds to periods, and keeping the caption text in timed cue blocks.
Does my subtitle file upload to AutoCaption?
No. The converter runs in your browser. The file text is read locally so you can copy or download the converted VTT file.
Can I convert a video into captions on this page?
No. This page converts subtitle text files. To generate captions from a video, use the AutoCaption caption generator. Open the caption generator.
Why can I not just rename .srt to .vtt?
A valid VTT file needs WebVTT formatting, including a WEBVTT header and period-based timestamp milliseconds. Renaming the file does not fix the subtitle syntax.
Should I use SRT or VTT for video captions?
Use VTT for HTML video tracks and web players. Use SRT when a platform, editor, or client asks for a simpler subtitle file. Keep both if the caption file will move between web, social, and archive workflows.
Need captions from a video?
Use the editor when you need transcription, translation, styling, SRT export, VTT export, or a captioned video.