Subtitle Composer

Linux

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Freedom report

Two barsScore 6.3

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

Subtitle Composer is ranked #7 of 31 in subtitle software on Freedom251. It runs on Linux. There is a free plan.

Subtitle Composer plans and pricing

All plans

Subtitle Composer Free Free No paid plans or usage limits stated apps.kde.org · 3 Oct 2026

Compared on subtitle software

Free plan: Yes
Auto-captioning: Yes
Subtitle translation: Yes
Speaker labels: Yes
SRT export: Yes
VTT export: Yes

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The record

What it does: Subtitle Composer is an open-source, text-based subtitle editor for basic and advanced editing.
Subtitle formats: It opens and saves text formats including SRT, MicroDVD, SSA/ASS, MPlayer, TMPlayer, and YouTube captions, and can open or OCR several graphics subtitle formats.
Video and audio: It can demux subtitle streams from video files and preview subtitles in an integrated video player or on an audio waveform, with audio stream selection.
Editing tools: Features include synchronization, time shifting and scaling, frame-rate conversion, joining and splitting files, side-by-side translations, text styling, spell checking, and timing-error detection.
Speech recognition: The application supports speech recognition from audio or video files using PocketSphinx.
Translation engines: The 0.8.0 release notes say DeepL and Google Cloud translation engines were added.
Scripting: The feature list describes scripting through languages supported by Kross; the 0.8.0 release notes say Kross was replaced with QJSEngine and Python and Ruby support were removed.
Download: The product page lists Linux installation through Discover or another AppStream store, distribution package managers, and Flathub, plus an x86_64 AppImage and source downloads.
Runtime requirement: The 0.8.2 release announcement says Subtitle Composer requires FFmpeg version 5.1.5 or later.
Security and privacy: KDE's software privacy policy says KDE software generally does not transmit information from end-user devices except after an explicit user action, and says any telemetry is opt-in and disabled by default where present.
Support: The product page links to KDE's Discuss help forum and provides a bug-report link.
License: The product page lists the license as GPL-2.0+.
Maker: KDE describes itself as an international community developing free, open-source software and says it has done so since 1996.
Legal entity: KDE says its legal and financial matters are represented by KDE e.V., a registered non-profit in Germany.
Price from: Free

Where it ranks on Freedom251

Best Subtitle Software in 2026#7 of 31

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Sources

apps.kde.org/subtitlecomposer/· checked 3 Oct 2026
subtitlecomposer.kde.org/2025/09/14/subtitle-composer-0.8.2-rele· checked 3 Oct 2026
kde.org/privacypolicy-apps/· checked 3 Oct 2026
kde.org/community/whatiskde/· checked 3 Oct 2026