SRT vs VTT: What Is the Difference?

Short answer: they describe the same thing in slightly different syntax. SRT (SubRip) is what nearly every subtitle editor and transcription tool produces. WebVTT is what HTML5 video and browser-based players expect. If a player rejects your captions, the format is usually the reason.

What actually differs

The differences are small, mechanical and easy to get wrong by hand:

• The header. A WebVTT file begins with the line WEBVTT. An SRT file has no header at all and starts straight at the first cue.
• The timestamp separator. SRT writes milliseconds after a comma (00:00:08,200). WebVTT requires a period (00:00:08.200). This single character is the most common reason a converted file fails to load.
• Cue numbers. SRT numbers every cue. WebVTT allows optional cue identifiers but does not require them.
• Where each is used. SRT is the interchange format of the subtitling world. WebVTT is the format the web standardised on, so browsers, HTML5 <video> elements and many course and hosting platforms insist on it.

Side by side

The same cue in each format:

SRT
1
00:00:08,200 --> 00:00:11,600
Welcome to our video presentation.

WebVTT
WEBVTT

00:00:08.200 --> 00:00:11.600
Welcome to our video presentation.

The words, the line breaks and the timings are identical. Only the packaging changes.

Which one do you need?

• Use WebVTT when you are adding a caption track to a <video> element on your own site, uploading to a course platform that only accepts .vtt, or working with a video host that rejects SRT.
• Use SRT when you are handing the file to an editor, a translator, or a platform that asks for SubRip — which is still the majority of subtitling workflows.

How to convert, step by step

1. Open the SRT to VTT converter.
2. Drop your .srt file onto the page or select it from your device.
3. Press convert. The page rewrites the file in WebVTT syntax immediately — it writes the WEBVTT header and changes the timestamp commas to periods.
4. Download the .vtt file and attach it to your player.

Every cue keeps its start and end time, and two-line captions stay two-line captions, so reading speed does not change. Going the other way works the same: convert VTT back to SRT when a tool asks for SubRip.

A realistic example

You have transcribed a 20-minute training video and your transcription tool exported training.srt. Your learning platform's upload form greys out the file and says "unsupported subtitle format". Converting to .vtt takes a few seconds and the upload goes through unchanged — same words, same timings, correct syntax.

What conversion cannot fix

Conversion is a syntax translation, not a repair. If your timestamps are already malformed, out of order, or overlapping, converting the file will not correct them. Fix the source file first in a subtitle editor.

Related tools

Both converters sit under Subtitle and Translation Tools. If you do not have a caption file yet, generate subtitles from the video audio first. If you already have one and need another language, use the subtitle translator.

Frequently asked questions

Can I just rename the .srt file to .vtt?

No. Renaming does not add the WEBVTT header or change the comma in the timestamps, so a compliant player will still reject the file.

Is my subtitle file uploaded to a server?

No. The conversion happens in the page itself, so the file is not sent to the Bubixo server. Nothing is stored, which also means there is no copy to delete afterwards.

Is there a limit on how many files I can convert?

No. The converter is free, needs no account, adds no watermark and does not limit how many files you convert.

Will the styling in my subtitles survive?

The cue text, ordering and timings are preserved. WebVTT supports styling features that SRT does not, but the converter does not invent styling that was not in your source file.

Which format should I archive?

Keep the SRT. It is the more widely accepted interchange format, and generating a VTT from it takes seconds whenever you need one.

Before you convert

Subtitles are a full transcript of everything said in a video, which often makes them more sensitive than the video description. Only convert subtitle files you own or have permission to process.