SSA to TTML Subtitle Converter
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100% local processing in your browser. No upload. No waiting.
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Supports .ssa files up to 50 MB
More Subtitle Tools
How It Works
Upload SSA File
Drag & drop or select your .ssa file
Convert Instantly
We process it locally in your browser
Download TTML
Get your .ttml file immediately
More Conversions You Might Need
Why Choose AllSubConverter?
Your Privacy Matters
Everything runs in your browser. Your files are never uploaded.
Lightning Fast
Optimized processing engine converts files in seconds.
Free & Local
Each file can be up to 50 MB. Batches can contain up to 200 files or 1 GB total.
Works Everywhere
Works on Windows, Mac, Linux, iOS, Android - any modern browser.
Free Online SSA to TTML Converter
Our SSA to TTML converter reads SubStation Alpha input and produces a basic Timed Text Markup Language document entirely in your browser. Source SSA timing becomes second-based begin and end attributes such as 1.500s. SSA override tags are stripped, XML special characters are escaped, and line breaks become <br/> elements. The conversion runs client-side, so your subtitle files are never uploaded to a server.
Input Format
SSASSA (SubStation Alpha v4) is the predecessor to ASS and shares the same section-based structure: [Script Info], [V4 Styles], and [Events] with Dialogue lines. SSA supports fonts, colors, and basic positioning but predates some ASS additions such as blur. Because SSA and ASS use the same Dialogue layout, they are parsed identically.
Output Format
TTMLTTML (Timed Text Markup Language) is a W3C XML subtitle format. This converter emits a basic UTF-8 document with a default TTML namespace, xml:lang="en", body and div elements, and <p> cues using second-based begin and end attributes. It does not add IMSC, ITT, or broadcaster profile metadata.
Features
Why Convert?
Format Differences
Common Use Cases
Streaming Delivery
Create a basic TTML starting point for tools that ingest timed-text XML.
Professional Interchange
Use TTML as a structured interchange format for XML-based timed-text workflows.
IMSC / ITT Profiles
Generate basic TTML that downstream tooling can validate and profile as required.
Related Formats
SRT (SubRip)
The universal plain-text alternative: convert to SRT for maximum device compatibility.
VTT (WebVTT)
The web alternative: convert to VTT if your target is HTML5 video or YouTube.
SCC (Scenarist Closed Captioning)
The North American broadcast alternative: convert to SCC for CEA-608 caption delivery.
Frequently Asked Questions
It reads a SubStation Alpha file, parses each cue's timing and text, and writes a basic UTF-8 TTML document with second-based begin and end attributes, escaped text, and <br/> line breaks.
Absolutely. Every conversion runs client-side in your browser. No subtitle data, file contents, or metadata is ever transmitted to a server.
Yes. SSA styling and override tags are dropped. XML special characters are escaped and line breaks become <br/> tags; timing is converted to TTML expressions.
Yes, completely free with no sign-up, no watermarks, and files up to 50 MB each. All processing happens in your browser, so your files are never uploaded to a server.
Source SSA timing (H:MM:SS.cc centiseconds) is converted to TTML timing (seconds (1.500s) or clock values).
Yes. The responsive page works in modern mobile browsers.