Add your SRT file
Drop one or more .srt files onto the converter above, or browse for them. They load into browser memory only — nothing is uploaded, so there is no size-based pricing and no server queue.
SRT to DFXP
Converting a .srt file to .dfxp extracts the document's content from its office package into a portable form. Free, private, and validated — the file never leaves your browser.
Private for supported formats — processed in your browser
Runs on your deviceConvert supported files
Drop SRT files here
Batch files can each use a different output. Nothing uploads for local conversions.
Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.About converting SubRip subtitles to DFXP timed text
Converting a .srt file to .dfxp extracts the document's content from its office package into a portable form. A .srt file is a SubRip subtitle document: numbered cues with start and end timestamps and plain caption text. It is the most common caption sidecar for video players, editors, and streaming toolchains that need a simple, widely understood text format.
A .dfxp file is a TTML document written to the Distribution Format Exchange Profile — the profile the W3C defined for handing finished captions to a distributor. The extension signals the profile; the contents are ordinary TTML, which is why the same parser reads both. For this route the practical draw is accepted by name across a wide set of streaming ingest specifications and fully TTML, so any TTML tool can read and validate it — balanced against the distinct extension implies a distinct format and regularly confuses tooling, which is worth knowing before you commit a large batch.
Why convert SRT to DFXP?
The practical trigger for this conversion is usually a mismatch: with .srt, no standard support for advanced styling, voices, or regions. Switching to .dfxp buys you accepted by name across a wide set of streaming ingest specifications, which is why it is the better fit for delivering captions to a platform whose spec names DFXP by extension. Because the conversion runs locally, trying it costs nothing but a few seconds of compute on your own machine.
SRT vs DFXP at a glance
| Aspect | SubRip subtitles (.srt) | DFXP timed text (.dfxp) |
|---|---|---|
| Format type | Text-based — characters and structure, so there is no visual quality loss | Text-based — characters and structure, so there is no visual quality loss |
| How it stores data | cues are blocks of an index, a timecode arrow line (HH:MM:SS,mmm --> HH:MM:SS,mmm), one or more text lines, and a blank separator | the document is TTML: a <tt> root, a <body>/<div> structure, and <p> cues with begin and end attributes |
| Strongest at | delivering captions alongside MP4 or MKV downloads | delivering captions to a platform whose spec names DFXP by extension |
| Weak spot | no standard support for advanced styling, voices, or regions | the distinct extension implies a distinct format and regularly confuses tooling |
Pick DFXP as the output
Select .dfxp in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if DFXP is selectable, the route is real and validated.
Convert on your device
Press Convert. The package is unzipped in memory and its XML content parsed locally; nothing is uploaded.
Verify and download
Each result is signature-checked before the download unlocks, so a failed encode can never masquerade as a valid DFXP file. Outputs keep the original filename with the .dfxp extension.
SRT to DFXP questions, answered
Will converting SRT to DFXP lose quality?
There is no visual quality to lose — srt is text-oriented and dfxp is text-oriented, so the question is structural fidelity. Text, ordering, and basic structure are preserved; complex layout, embedded objects, and styling beyond the target's model are simplified.
Is it private to convert SRT files here?
Yes — the .srt file is processed inside your browser tab and never uploaded. The package is unzipped in memory and its XML content parsed locally; nothing is uploaded. Close the tab and the file is gone from memory.
Where will the DFXP file work?
Streaming ingest pipelines, caption editors such as Subtitle Edit and CaptionMaker, and any TTML-aware library open .dfxp. Browsers and consumer players do not. Novus Convert reads it through the same hardened TTML parser used for .ttml — no document types, no external entities, no network access — and writes any of the twelve timed-text targets.
Will the DFXP file be bigger or smaller than my SRT?
It depends on the content: the document is TTML: a <tt> root, a <body>/<div> structure, and <p> cues with begin and end attributes. Convert one representative file first and compare before batch-processing a large set.
Can I convert DFXP back to SRT?
Yes — the reverse route exists as a separate tool. Bear in mind that round-tripping .srt → .dfxp → .srt is not a perfect undo when any lossy step is involved; keep your original if fidelity matters.