Convert SRT to DFXP Online Free
Convert SRT subtitle files to DFXP XML format for broadcast delivery, professional subtitle tools, and legacy systems that require the DFXP distribution profile.
By ChangeThisFile Team · Last updated: March 2026
ChangeThisFile converts SRT to DFXP on a secure server. Upload your SRT subtitle file and it is converted to DFXP XML format with proper TTML namespace declarations and begin/end timestamps. Files are auto-deleted after conversion. Free with no signup required.
Convert SRT to DFXP
Drop your SRT file here to convert it instantly
Drag & drop your .srt file here, or click to browse
Convert to DFXP instantly
SRT vs DFXP: Format Comparison
Key differences between the two formats
| Feature | SRT | DFXP |
|---|---|---|
| Structure | Plain text blocks | XML (TTML-based) |
| Styling | Basic bold/italic | XML styling attributes (tts:*) |
| Positioning | Not supported | Named regions with coordinates |
| File size | Compact | Larger due to XML overhead |
| Editability | Any text editor | XML editor recommended |
| Player support | All video players | Broadcast and professional tools |
| Use case | Consumer distribution | Broadcast and archive delivery |
When to Convert
Common scenarios where this conversion is useful
Delivering subtitles to a broadcast archive system
Legacy broadcast archive systems and subtitle management platforms often require DFXP as the ingest format. Converting SRT to DFXP makes your subtitles compatible with these systems.
Meeting broadcast delivery specifications
Some TV networks and film deliverables specify DFXP in their delivery requirements. Converting your SRT working files to DFXP at the end of the workflow meets those specifications.
Importing subtitles into legacy subtitle authoring tools
Older professional subtitle tools like Cavena or older versions of Timed Text Author require DFXP or TTML input. Convert SRT to DFXP to import into these systems.
How to Convert SRT to DFXP
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1
Upload your SRT file
Drag and drop your SRT subtitle file onto the converter, or click browse to select it. The upload is encrypted.
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2
Server-side conversion
The server parses each SRT cue, converts timestamps to TTML HH:MM:SS.mmm format, and writes a well-formed DFXP XML document using standard TTML namespace declarations.
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3
Download the DFXP
Save your converted DFXP file. The server copy is automatically deleted after processing.
Frequently Asked Questions
DFXP (Distribution Format Exchange Profile) is an XML subtitle format used for professional subtitle exchange in broadcast, film post-production, and archive systems. It is an older profile of TTML.
DFXP is a distribution profile of TTML from 2006. Modern TTML (1.0 and 2.0) superseded it. They share nearly identical XML structure and ChangeThisFile handles both.
Yes. The output uses standard W3C TTML namespace declarations and element structure. It is compatible with systems that accept DFXP or TTML 1.0 input.
Subtitle text is preserved. SRT HTML formatting tags like <b> and <i> are output as-is in the DFXP text content. They are not mapped to tts:fontStyle or tts:fontWeight attributes in this converter.
Yes. The DFXP output is valid XML. You can open it in an XML editor and add tts:* styling attributes and region definitions to meet your delivery specification.
Yes. Files are transferred over HTTPS and automatically deleted after the DFXP is ready for download.
SRT files are plain text. The 50 MB server limit is not a concern for subtitle files.
DFXP files typically use .dfxp or .ttml as the file extension. Both are interchangeable for TTML-profile files.
Yes. ChangeThisFile supports DFXP to SRT conversion for reversing the process.
For new projects, use TTML 1.0 or IMSC-1 rather than DFXP. DFXP is a legacy profile. However, if your delivery spec requires DFXP, this converter generates the required format.
Related Conversions
Need to convert programmatically?
Use the ChangeThisFile API to convert SRT to DFXP in your app. No rate limits, up to 500MB files, simple REST endpoint.
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