SRT vs TTML: Which Should You Use?
Side-by-side comparison of SRT and TTML subtitle formats — features, pros, cons, and conversion options.
SRT is best for Basic video subtitles and captions for maximum compatibility. TTML is best for Professional broadcast, streaming platforms, and accessibility-compliant subtitle delivery.
Quick Verdict
- ✓ Simplest and most widely supported subtitle format
- ✓ Plain text that is trivial to create and edit manually
- ✓ Supported by virtually every video player and platform
- ✗ No styling, formatting, or font control
- ✓ W3C standard used by Netflix, Amazon, and broadcast
- ✓ XML-based with rich styling and accessibility metadata
- ✓ Supports multiple regions and complex positioning
- ✗ Verbose XML structure compared to SRT or VTT
Specs Comparison
Side-by-side technical comparison of SRT and TTML
| Feature | SRT | TTML |
|---|---|---|
| Category | Subtitle | Subtitle |
| Year Introduced | 2003 | 2010 |
| MIME Type | text/srt | application/ttml+xml |
| Extensions | .srt | .ttml, .xml |
| Karaoke | ✗ | ✗ |
| Plain Text | ✓ | ✗ |
| Positioning | ✗ | ✓ |
| Styling | ✗ | ✓ |
| Web Support | ✗ | ✓ |
Pros & Cons
SRT
- ✓ Simplest and most widely supported subtitle format
- ✓ Plain text that is trivial to create and edit manually
- ✓ Supported by virtually every video player and platform
- ✗ No styling, formatting, or font control
- ✗ No positioning — subtitles always appear at the bottom
- ✗ No native web browser support without a player library
TTML
- ✓ W3C standard used by Netflix, Amazon, and broadcast
- ✓ XML-based with rich styling and accessibility metadata
- ✓ Supports multiple regions and complex positioning
- ✗ Verbose XML structure compared to SRT or VTT
- ✗ Complex to edit manually
- ✗ Limited support in consumer video players
When to Use Each
Choose SRT when...
- You need files optimized for Basic video subtitles and captions for maximum compatibility
- Simplest and most widely supported subtitle format
- Plain text that is trivial to create and edit manually
Choose TTML when...
- You need files optimized for Professional broadcast, streaming platforms, and accessibility-compliant subtitle delivery
- W3C standard used by Netflix, Amazon, and broadcast
- XML-based with rich styling and accessibility metadata
How to Convert
Convert between SRT and TTML for free on ChangeThisFile
Frequently Asked Questions
SRT is best for Basic video subtitles and captions for maximum compatibility, while TTML is best for Professional broadcast, streaming platforms, and accessibility-compliant subtitle delivery. Both are subtitle formats but they differ in compression, compatibility, and intended use cases.
It depends on your use case. SRT is better for Basic video subtitles and captions for maximum compatibility. TTML is better for Professional broadcast, streaming platforms, and accessibility-compliant subtitle delivery. Consider your specific requirements when choosing between them.
Go to the SRT to TTML converter on ChangeThisFile. Upload your file and the conversion processes on the server, then auto-deletes. It's free with no signup required.
Yes. ChangeThisFile supports TTML to SRT conversion. Upload your file for server-side conversion — files are auto-deleted after processing.
File size varies depending on the content, compression method, and quality settings of each format. In general, lossy formats produce smaller files than lossless ones. Test with your specific files to compare actual sizes.
Yes, SRT supports plain text, but TTML does not. This may be important depending on your use case.
Both SRT and TTML are supported file formats that are free to use. You can convert between them for free on ChangeThisFile — server-side conversions are free with no signup required.
TTML is newer — it was introduced in 2010, while SRT dates back to 2003. Newer formats often offer better compression and features, but older formats tend to have wider compatibility.
Related Comparisons
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