Subtitle formats
Every subtitle format conversion in one place
Captionry reads SRT, WebVTT, ASS/SSA, MicroDVD, YouTube SBV and TTML/DFXP, and writes SRT, WebVTT, ASS, MicroDVD and plain text. Pick the pair you need, or drop a mixed folder on the converter and choose the output.
- Whole folders to one zip
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Pick a conversion
A page for each format pair
Each page has the converter preset to that pair, what carries over, a real before and after, and the errors people hit.
From SRT
From WebVTT
From ASS and SSA
From MicroDVD
YouTube, TTML and cleaning
The formats
What each format is for
| Format | Extension | Used for | Holds |
|---|---|---|---|
| SRT (SubRip) | .srt | Editors, desktop players, most platforms | Text, timing, italic, bold, underline |
| WebVTT | .vtt | HTML5 video and course hosts | Text, timing, basic tags, cue settings (not carried to other formats) |
| ASS / SSA | .ass, .ssa | Styled and typeset subtitles | Text, timing, styles, positions, effects |
| MicroDVD | .sub | Older frame-based files | Text and frame numbers |
| SBV (YouTube) | .sbv | Caption downloads from YouTube Studio (input only) | Text and timing |
| TTML / DFXP | .ttml, .dfxp, .xml | Broadcast, streaming and older web player captions (input only) | Text, timing, styles, regions |
| Plain text | .txt | Transcripts | Text only, no timings (output only) |
Choosing
What is lost going from one format to another
- Going to SRT or plain text removes styling, positions and effects; the words and timing stay.
- Going to WebVTT keeps italic, bold and underline and adds the required header.
- Plain text cannot be converted back to a timed format, because it has no timings.
- SBV and TTML/DFXP are input formats: they convert to the others, and there is no SBV or TTML output.
- Image-based subtitles (VobSub .sub with .idx, Blu-ray .sup) are pictures, not text, and cannot be converted.
FAQ
Questions
Which subtitle formats can I convert?
SRT, WebVTT, ASS/SSA and MicroDVD can be read and written. YouTube SBV and TTML/DFXP can be read, and any of them can be written as SRT, WebVTT, ASS, MicroDVD or plain text. Plain text is output only.
Can I convert plain text to subtitles?
No. Plain text has no timings, so it is an output format only.
Can I mix formats in one batch?
Yes. Each file is detected by its content, then written in the format you choose.
Are my files uploaded?
No. The conversion runs in your browser tab.
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