Subtitle Composer - KF5/Qt Video Subtitle Editor
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SubtitleComposer TravisCI build

An open source text-based subtitle editor that supports basic and advanced editing operations, aiming to become an improved version of Subtitle Workshop for every platform supported by Plasma Frameworks.


  • Open/Save Text Subtitle Formats
    • SubRip/SRT, MicroDVD, SSA/ASS, MPlayer, TMPlayer and YouTube captions
  • Open/OCR Graphics Subtitle Formats
    • VobSub (.idx/.sub/.rar), formats supported by ffmpeg (DVD/Vob, DVB, XSUB, HDMV-PGS)
  • Demux/OCR/Import Graphics/Text Subtitle Formats directly from video
    • SRT, SSA/ASS, MOV text, MicroDVD, Graphic formats supported by ffmpeg (DVD/Vob, DVB, XSUB, HDMV-PGS)
  • Speech Recognition from audio/video file using PocketSphinx
  • Smart language/text encoding detection
  • Live preview of subtitles in integrated video player (GStreamer, MPlayer, MPV, Xine, Phonon) w/ audio stream selection
  • Preview/editing of subtitles on audio waveform w/ audio stream selection
  • Quick and easy subtitle sync:
    • Dragging several anchors/graftpoints and stretching timeline
    • Time shifting and scaling, lines duration re-calculation, framerate conversion, etc.
    • Joining and splitting of subtitle files
  • Side by side subtitle translations
  • Text styles (italic, bold, underline, stroke, color)
  • Spell checking
  • Detection of timing errors in subtitles
  • Scripting (JavaScript, Python, Ruby and other languages supported by Kross).

Main Window




Instructions for building from sources can be found on wiki page


Submit bug reports or feature requests to the issue tracker on GitHub.

Video tutorials are very welcome as are any kind of documentation/tutorials/examples, please let us know if you make some.

Feedback and/or ideas on how to make Subtitle Composer better are welcome and appreciated.

Pull requests and patches are welcome. Please follow the coding style.


Subtitle Composer is released under GNU General Public License v2.0