TTML is the W3C Timed Text Markup Language, an XML subtitle format used in broadcast, streaming and professional caption workflows.

DFXP is the earlier name and namespace used by TTML. This converter reads common legacy DFXP documents and writes them using the current TTML namespace.

Are frame and tick timings supported?

Yes. The parser supports clock time, offset units, frames, subframes, ticks, frame-rate multipliers and timed parent containers.

Can I convert TTML back to SRT or VTT?

Yes. Upload TTML or DFXP to the existing SRT or VTT converter. Cue ranges and dialogue remain, while regions and format-specific presentation metadata are simplified.

Is XML processed safely?

Yes. DTD and custom entity declarations are rejected, external network loading is disabled, and unsupported XML is never expanded.

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Convert to TTML

W3C timed text

Move captions into a professional TTML timeline.

Convert SRT, VTT, SBV, LRC or legacy DFXP into canonical TTML. The parser resolves clock, frame and tick grammar before writing one predictable timeline.

TTML 1/2 structure Legacy DFXP Batch + ZIP

Timing grammar map Normalized to ms

Clock

00:01:12.480

Direct media position

Frame

00:01:12:14.1

Uses rate + multiplier

Tick

1812t

Resolved by tickRate

<p begin="00:01:12.480" end="00:01:15.200">
Caption text
</p>

01 / Source files

Upload subtitle or timed-text files

Up to 100

Drop files here or browse SRT, VTT, SBV, LRC, iTT, TTML, DFXP, XML · ZIP/RAR/7Z batches

02 / TTML output

Preservation contract

Cue ranges stay precise

Begin and end positions are written as stable millisecond clock values.

Unicode and portable emphasis stay

Multiline dialogue plus bold, italic and underline spans are normalized safely.

Layout metadata is simplified

Regions, animation, fonts, colors and vendor extensions do not have portable equivalents across every input format.

Need the reverse direction?

The SRT and VTT tools now detect both modern TTML and legacy DFXP.

TTML → SRT TTML → VTT

Upload at least one subtitle file to continue.

CLOCK · FRAME · TICK

Real timing grammar

Supports parent offsets, durations, sequential containers, effective frame rates, subframes and tick rates—not just simple clock timestamps.

DFXP → TTML

Legacy namespace upgrade

Older DFXP timed text is read through its historical W3C namespaces, then emitted as compact, current TTML XML.

XML HARDENED

No external entities

DTD and entity declarations are rejected and network resolution is disabled before the XML document reaches the timing engine.