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Subtitle Format Comparison Guide

Choosing the right subtitle format depends on where the file will be used. Use these comparison pages to make the right call — then convert for free in your browser.

Format Overview Matrix

Quick reference: which format to use for each workflow.

Format Best for Styling Web <track> YouTube Editability Conversion risk
SRT .srt General compatibility Minimal Needs VTT conversion ✅ Very easy Low
VTT .vtt HTML5 web video Medium (CSS cue) ✅ Native ✅ Easy Low
ASS .ass Styled subtitles / anime Advanced ❌ Limited ❌ Specialized High (styling lost)
SBV .sbv YouTube captions None ❌ ✅ Easy Low
TTML/DFXP .ttml Broadcast / OTT delivery Rich (XML) ❌ Not native ✅ (partial) Specialized Medium/high
SCC .scc Broadcast CEA-608 Broadcast-specific ❌ ✅ Specialized Medium/high
SSA .ssa Legacy styled subtitles Advanced (legacy) ❌ ❌ Specialized High
TXT .txt Plain transcripts None ❌ ❌ ✅ Easy No timing

Format Comparison Pages

Each page is a detailed decision guide with format definitions, syntax examples, platform compatibility tables, conversion warnings, and FAQs.

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SRT vs VTT
The most common question. Web video (<track>) vs universal compatibility. With syntax examples and platform table.
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SRT vs ASS
Compatibility vs styling. When to keep ASS for anime/typeset subtitles, and what is lost when converting to SRT.
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Subtitles vs Captions
Accessibility, dialogue, sound effects, WCAG requirements, and which HTML kind to use on a track element.
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Open vs Closed Captions
Burned-in vs toggleable. Social media, SEO implications, accessibility differences, and when to burn captions into video.
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SRT vs SBV
YouTube’s SBV format vs universal SRT. Syntax differences, when SBV files appear, and how to convert.
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SRT vs TTML
Plain text vs XML. When TTML/DFXP is required for broadcast, OTT delivery, or EBU-TT European TV.
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VTT vs TTML
Web video vs structured timed text. Browser support, streaming platform requirements, and HLS/DASH delivery.
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SRT vs TXT
Timed subtitle file vs plain transcript. Workflows for content repurposing, AI input, and converting between formats.
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SSA vs ASS
SubStation Alpha v4 vs Advanced SubStation Alpha v4+. Format differences, which to use, and how to convert old SSA files.
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SCC vs SRT
Broadcast CEA-608 captions vs online subtitles. When SCC is required and how to convert SCC files to usable SRT.

Quick Decision Guide

I need the most compatible format

  • Use SRT — works on YouTube, editors, hardware players, and most platforms
  • Convert to VTT when you need HTML5 <track>

I’m building a website with video

  • Use VTT — the only natively supported format for HTML5 <video><track>
  • Convert your SRT: SRT → VTT →

I have anime / styled subtitles

  • Keep ASS as master, generate SRT for uploads
  • Never discard the original ASS file
  • SRT vs ASS guide →

I need an accessible website

Free Subtitle Conversion Tools

All tools run in your browser — no upload, no account, 100% private.

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SRT to VTT
For HTML5 web video
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VTT to SRT
For video editors
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SRT to ASS
Add styling support
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SRT to TXT
Extract transcript
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Fix SRT
Repair numbering, timestamps
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SRT Editor
Edit subtitle text online
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Delay Fixer
Shift subtitle timing
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YouTube → SRT
Timed subtitle from transcript

About These Comparison Pages

These guides are designed as decision pages, not generic blog posts. Each one answers the specific question of which format to use, what will break during conversion, which platforms support each format, and where to convert right now. All conversion tools run locally in your browser — no file ever leaves your device.

Also see: AudioTools.space — free audio editing tools that also run 100% in your browser.