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TTML to ASS Subtitle Converter

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TTML
<?xml version="1.0" encoding="UTF-8"?>
<tt xml:lang="en" xmlns="http://www.w3.org/ns/ttml">
<body>
<div>
<p begin="1.000s" end="4.000s">Hello, world!</p>
<p begin="4.500s" end="8.000s">This is a subtitle file.</p>
<p begin="8.500s" end="12.000s">Converted locally!</p>
</div>
</body>
</tt>
ASS
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:01.00,0:00:04.00,Default,,0,0,0,,Hello, world!
Dialogue: 0,0:00:04.50,0:00:08.00,Default,,0,0,0,,This is a subtitle file.
Dialogue: 0,0:00:08.50,0:00:12.00,Default,,0,0,0,,Converted locally!

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Supports .ttml, .itt, .xml files up to 50 MB

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How It Works

1

Upload TTML File

Drag & drop or select your .ttml file

2

Convert Instantly

We process it locally in your browser

3

Download ASS

Get your .ass file immediately

More Conversions You Might Need

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SRT ASSVTT ASSLRC ASSSBV ASSSSA ASSSCC ASSSTL ASSSMI ASS

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 TTML to ASS Converter

This converter reads <p> cues from a TTML document and writes an ASS file with timing and text. Supported begin, end, and duration values are converted to ASS centiseconds, <br/> elements become line breaks, and common TTML inline tags are removed. The output uses a single default ASS style rather than mapping source styling.

Input Format

TTML

TTML (Timed Text Markup Language) is an XML subtitle format. This converter looks for <p> elements with begin and end, or begin and dur, timing attributes. It accepts second-based values such as 1.500s and clock values such as 00:00:01.500. Cues without a begin attribute are skipped.

Output Format

ASS

ASS (Advanced SubStation Alpha v4+) is a text subtitle format with script information, styles, and Dialogue events. This converter creates a complete basic ASS document with one Default style, Arial 20, and a 1920x1080 play resolution. Source styling is not mapped.

Features

Reads TTML <p> cues with begin/end or begin/dur timing
Converts timing to ASS H:MM:SS.cc centiseconds
Turns <br/> elements into ASS line breaks
Removes common TTML inline formatting tags
Creates a complete basic ASS document with a Default style
Processes files locally in your browser

Why Convert?

ASS is a convenient editing format when you need to continue timing or restyling work.
ASS has broad support in desktop subtitle editors and renderer ecosystems.
The output uses a predictable default style rather than requiring source styling to be rebuilt.
Converting TTML text and timing can make the cue list easier to inspect and edit.

Format Differences

TTML is XML; ASS is a sectioned plain-text format.
TTML uses begin, end, and dur attributes; ASS Dialogue lines use Start and End fields.
TTML timing is converted to ASS centisecond precision.
TTML source styling is discarded; the ASS output uses one Default style.

Common Use Cases

Subtitle Editing

Move TTML cue text and timing into ASS for additional editing in a subtitle editor.

Restyling

Use the generated Default-style ASS document as a clean starting point for custom styling.

Timing Cleanup

Inspect converted start and end times while preserving cue text and line breaks.

Related Formats

SRT (SubRip)

Convert TTML to SRT for a simpler plain-text subtitle format.

VTT (WebVTT)

Convert TTML to VTT for a basic web-video cue format.

TTML (Timed Text Markup Language)

Keep TTML when your destination requires the original XML structure or metadata.

Frequently Asked Questions

No. Common inline formatting tags are removed during parsing, and the ASS output uses one Default style.

ASS timing is written to centisecond precision. Fractional milliseconds beyond that precision are truncated.

No. Processing stays in your browser and the subtitle file is not uploaded.

If end is present, it is used. Otherwise dur is added to begin. If neither is present, the converter uses a three-second fallback duration.

Yes. There is no registration or watermark, and conversion happens in your browser.

They are skipped because the converter cannot determine their start time.

Ready to convert your subtitles?

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Related Resources

What is TTML?What is ASS?ASS vs TTMLASS vs LRCASS vs SBVASS vs SCC