Subtitle Composer is an open source text-based subtitles editor that supports basic operations as well as more advanced ones, aiming to become an improved version of Subtitle Workshop for every platform supported by KDE.
Key Features
- Open/Save Text Subtitle Formats:
- SubRip/SRT, MicroDVD, SSA/ASS, MPlayer, TMPlayer and YouTube captions.
- Open/OCR Graphics Subtitle Formats:
- VobSub (.idx/.sub/.rar), BluRay/PGS (*.sup), formats supported by ffmpeg (DVD/Vob, DVB, XSUB, HDMV-PGS).
- Demux Graphics/Text Subtitle Stream from video file:
- 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 (MPV, GStreamer, MPlayer, 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.
Website: subtitlecomposer.kde.org
Support: Code Repository
Developer: Mladen Milinkovic, Sergio Pistone, and translators
License: GNU General Public License v2.0

Subtitle Composer is written in C++. Learn C++ with our recommended free books and free tutorials.
Related Software
| Subtitle Editors | |
|---|---|
| Subtitle Edit | Versatile and feature-laden editor for video subtitles |
| Gaupol | Editor for text-based subtitle files |
| Aegisub | Highly customizable tool for creating and modifying subtitles |
| AutoSubs | Subtitles made simple |
| Subtitle Composer | Editor that supports basic and advanced operations |
| Jubler | Author new subtitles - convert, transform, correct and refine |
| Gnome Subtitles | Video subtitling for the GNOME desktop |
| Tero Subtitler | Feature-rich subtitle creation, translation and validation tool |
| YTSubConverter | Create styled YouTube subtitles |
| Subtitle Forge | Desktop application for working with subtitles across the full workflow |
| Sub Editor | Visual, keyboard-driven subtitle editor with waveform timing |
| Subtitle Editor | GTK+3 tool to edit subtitles |
| Subtitld | Edit, transcribe and create subtitles |
| subedit | Command-line editor written in Bash |
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Brilliant subtitle software that shows subtitles directly on the waveform. Its benefits from an excellent intuitive interface that makes it far easier to use than other subtitling tools. The waveform editor used easy-to-see waveforms and block sections that are easily adjustable. I find it easier to use that Aegisub, which is excellent but in need of redesigns of its interface.