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Software · Video editing

Subtitle Composer

Video subtitle editor that supports basic and advanced editing operations.

  • Completely free
  • Linux
  • Open source

Overview

Subtitle Composer is a subtitle editor, available on Linux.

Features described in its Flathub listing and on its official website: subtitles, text recognition (OCR), voice input and commands.

File formats mentioned: SRT, RAR and MOV.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “Video subtitle editor” — official website, 10 November 2026
  • “Video subtitle editor” — official website, 10 November 2026
  • “Open/OCR Graphics Subtitle Formats - VobSub (.idx/.sub/.rar), BluRay/PGS (*.sup), formats supported by ffmpeg (DVD/Vob, DVB, XSUB, HDMV-PGS)” — Flathub, 10 November 2026
  • “Speech recognition from audio/video file using PocketSphinx” — Flathub, 10 November 2026

At a glance

Subtitle Composer is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (GPL-2.0+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

  • Open source code
  • Commercial use allowed

About

Subtitle Composer is an open source text-based subtitle editor that supports basic and advanced editing operations. 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, 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 w/ audio stream selection Preview/editing of subtitles on graphical audio waveform w/ audio stream selection Sync by 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).

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Flathub (credit card, publisher, licence, free status, platforms, commercial use, version) —
  • Facts collected from Official plan pages (pricing, licence, terms) (commercial use) —
  • Last technical check: 6 November 2026
  • Description from Flathub — AppStream (Flathub)

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