PixScript logoPixScript
← Back to Blog

SRT vs VTT: Which Subtitle Format Should You Use?

Rachel Nguyen··8 min read
SubtitlesVideo ToolsFormats
Laptop on wooden desk showing video editing timeline with subtitle tracks, headphones and smartphone beside it

You've got a video and you need subtitles. You open the export menu and see two options: SRT and VTT. They look almost identical. Both have timestamps. Both display text on screen. So which subtitle format do you actually pick?

Short answer: Use SRT if you're uploading to YouTube, TikTok, or most social platforms. Use VTT if you're embedding video on your own website with HTML5. Both formats contain the same core data — timed text — but they differ in styling support, platform compatibility, and technical details.

The rest of this guide breaks down exactly when to use each one, how they differ under the hood, and how to convert between them.

What Is an SRT File?

SRT stands for SubRip Subtitle. It's the oldest and most widely used subtitle format, dating back to the early 2000s. The format is dead simple — a plain text file with numbered entries, timestamps, and text.

Here's what an SRT file looks like:

1
00:00:01,000 --> 00:00:04,500
Welcome to our channel.

2
00:00:05,000 --> 00:00:08,200
Today we're covering subtitle formats.

Each entry has four parts:

  • A sequential number (1, 2, 3...)
  • A timestamp range with start and end times
  • The subtitle text (one or two lines)
  • A blank line separating entries

Notice the comma in the timestamp (00:00:01,000). That comma separates seconds from milliseconds. It's one of the key technical differences from VTT, and it trips people up when converting between formats.

SRT files don't support styling. No bold, no italic, no colors, no positioning. Just plain text with timing data.

What Is a VTT File?

VTT stands for Web Video Text Tracks (WebVTT). The W3C designed it specifically for HTML5 video. If SRT is the old reliable, VTT is the modern upgrade built for the web.

Here's the same content as a VTT file:

WEBVTT

00:00:01.000 --> 00:00:04.500
Welcome to our channel.

00:00:05.000 --> 00:00:08.200
Today we're covering subtitle formats.

The differences are subtle but real:

  • VTT files start with WEBVTT on the first line (required header)
  • Timestamps use a period (.000) instead of a comma (,000)
  • Entry numbers are optional
  • VTT supports styling: bold, italic, font color, and text positioning
  • You can add metadata and cue settings for advanced formatting

VTT also supports something SRT can't: CSS-based styling. You can control font size, background color, and text position using ::cue selectors in your stylesheet.

SRT vs VTT: Side-by-Side Comparison

Here's how the two formats stack up across the factors that actually matter:

FeatureSRTVTT
File extension.srt.vtt
Timestamp separatorComma (,)Period (.)
Required headerNoneWEBVTT
Entry numberingRequiredOptional
Bold/ItalicNot supportedSupported
Font colorNot supportedSupported
Text positioningNot supportedSupported
CSS stylingNot supportedSupported via ::cue
Browser native supportNeeds JavaScript libraryNative HTML5 <track>
Social media supportYouTube, TikTok, Facebook, VimeoLimited
File sizeSlightly smallerSlightly larger

The biggest practical difference: browsers only support VTT natively through the HTML5 <track> element. If you try to use an SRT file with <video> tags on your website, nothing will display without a JavaScript parser.

When to Use SRT

SRT is your go-to format for distribution. Here's where it works best:

Social media and video platforms. YouTube, TikTok, Facebook, Vimeo, LinkedIn, and Netflix all accept SRT files. It's the universal format that works almost everywhere.

Video editing software. Premiere Pro, Final Cut Pro, DaVinci Resolve, and CapCut all import SRT files without issues.

Maximum compatibility. If you don't know where your subtitles will end up, SRT is the safer choice. It's been around for 20+ years and virtually every tool supports it.

Sharing with clients or collaborators. SRT files are simple to open in any text editor. No special software needed to read or edit them.

Pick SRT when you're creating subtitles for platforms you don't control, or when you need one file that works everywhere.

When to Use VTT

VTT wins when you control the playback environment. Here's where it shines:

Your own website. If you're embedding video with HTML5 <video> tags, VTT is the only subtitle format browsers support natively. No libraries, no plugins — just add a <track> element pointing to your .vtt file.

Styled subtitles. Need colored text, specific positioning, or custom fonts? VTT handles all of that. SRT gives you plain white text and nothing else.

Accessibility compliance. WCAG guidelines reference WebVTT as the standard for web video captions. If you're building an accessible website, VTT is the recommended format.

Online course platforms. Many e-learning platforms (Teachable, Thinkific, custom LMS) prefer or require VTT for their video players.

Pick VTT when you're publishing on your own domain and want more control over how subtitles look.

How to Convert SRT to VTT (and Back)

Converting between the two formats is straightforward because the underlying data is the same. You're mostly changing three things:

  1. The header: Add WEBVTT at the top (for SRT to VTT) or remove it (for VTT to SRT)
  2. The timestamp separator: Swap commas for periods (or vice versa)
  3. Entry numbers: Add them (for VTT to SRT) or remove them (optional for SRT to VTT)

You can do this manually in a text editor for short files. For longer subtitle files, online converters like Subtitle Tools or HappyScribe handle it in seconds.

The better approach: generate your subtitles in the right format from the start. If your transcription tool exports both SRT and VTT, just pick the one you need and skip the conversion step entirely.

How PixScript Handles Subtitle Formats

PixScript exports transcripts in both SRT and VTT formats, so you don't need to pick one and convert later. Paste a YouTube, TikTok, or Instagram Reels URL, and you get a timestamped transcript you can download as either format with one click.

The Pro plan ($9/mo) includes SRT, VTT, PDF, and TXT exports for every transcript. The free tier gives you TXT exports for up to 10 transcripts per month across all platforms.

If you're creating subtitles for both a social media upload (SRT) and your own website (VTT), PixScript lets you grab both from the same transcript without running the video through two different tools.

Common Mistakes to Avoid

A few things catch people off guard when working with subtitle files:

Mixing up the timestamp format. SRT uses commas (00:00:01,500), VTT uses periods (00:00:01.500). Get this wrong and the file won't parse. Most errors come from manual editing where someone accidentally uses the wrong separator.

Forgetting the WEBVTT header. A VTT file without WEBVTT on the first line is just a broken text file. Browsers will ignore it silently — no error message, just no subtitles.

Using SRT on a website without a parser. The HTML5 <track> element only accepts VTT. If you drop an SRT file into your <track src>, browsers won't display anything. You'd need a JavaScript library like video.js to parse SRT on the web.

Over-styling VTT files. Just because VTT supports colors and positioning doesn't mean you should use them. Keep subtitles readable — high contrast text on a semi-transparent background works best. Fancy formatting often hurts readability on mobile screens.

Frequently Asked Questions

Can I use SRT files on my website?

Not directly. HTML5 video players only support VTT natively through the <track> element. You'd need a JavaScript library like video.js or plyr to parse SRT files in the browser. The easier option is to convert your SRT to VTT — the content is identical, just the format wrapper changes.

Which format does YouTube accept?

YouTube accepts both SRT and VTT for manual subtitle uploads, but SRT is the more common choice. YouTube also auto-generates captions, which you can download in SRT format from YouTube Studio under Subtitles > your language > Download.

Is one format more accurate than the other?

No. SRT and VTT contain the same data: timestamps paired with text. Accuracy depends entirely on the transcription quality, not the file format. A poorly transcribed VTT file isn't better than a well-transcribed SRT file.

Can I convert between SRT and VTT without losing data?

For basic subtitles, yes — the conversion is lossless. The text and timestamps transfer perfectly. If your VTT file uses styling (bold, colors, positioning), those features will be lost when converting to SRT since SRT doesn't support formatting.

What about ASS and SSA subtitle formats?

ASS (Advanced SubStation Alpha) and SSA are older formats with rich styling support — fonts, colors, animations, positioning. They're popular in anime fansubs but rarely used on modern platforms. For most creators, SRT or VTT covers everything you need.

If you need subtitles from a video, PixScript can help. Paste any YouTube, TikTok, or Instagram URL and download the transcript as SRT or VTT — whichever format your project needs.