Gaupol

Gaupol brings subtitle editing, translation, timing and error correction together in a desktop tool, with video playback to help align captions. Its free GPL license and Linux packaging make it a practical choice for Linux users who want a focused editor without a subscription.

Overview

Gaupol works with text-based subtitle files, supporting creation and translation as well as timing adjustments against video. It also aims to correct common subtitle errors. Multiple subtitle formats and SRT and VTT export cover familiar file workflows, while the included aeidon library can be installed separately for reading, writing and manipulating text-based subtitles.

The built-in player is useful when timing captions, and Gaupol can also launch an external player. The integrated player relies on GStreamer, so broader container and codec support depends on installing additional GStreamer plugins. That flexibility is helpful on Linux, but playback may take more setup than an editor with a self-contained video stack.

Key features

• Subtitle editing and translation: Create and translate text-based subtitle files, adjust timing to video and correct common errors.
• Format support: Work with multiple subtitle formats and export to SRT or VTT, useful when a project needs common delivery formats.
• Video playback: Use the integrated GStreamer player or launch an external player. GStreamer plugins can expand container and codec support.
• Optional dependencies: The installation guide identifies libspelling for spell-check and charset-normalizer for automatic character-encoding detection. These capabilities depend on the optional packages.
• Help and issue reporting: Documentation, discussions and an issue tracker provide routes for guidance and reporting problems.

Pricing

Gaupol — free. The free plan is Free Software under the GNU General Public License (GPL), with no paid tier or trial to weigh against it. Linux users get the editor without a license charge; the trade-off is that setup and playback support may depend on their distribution and installed GStreamer plugins.

Platforms

Linux is the practical supported choice. Gaupol is packaged for most popular Linux distributions, with a Flatpak release and source code also offered.

Windows is a limited legacy option: installers are no longer built, the latest Windows version is 1.3.1, and its built-in player is disabled. That makes Windows a poor fit for anyone seeking a maintained installation path or integrated video playback.

Who it's for

Gaupol suits Linux users who need a free desktop editor for text-based subtitles, especially those who value translation, timing and correction tools in one application. It is less compelling for Windows users who need current installers or built-in playback, and for anyone who wants video compatibility without configuring GStreamer plugins.

Pros and cons

• Pros: Free GPL software with Linux distribution packages, Flatpak and source code; supports multiple subtitle formats, subtitle translation, SRT and VTT export; offers integrated and external-player workflows.
• Cons: Windows installers are discontinued and the built-in player is disabled; integrated playback depends on GStreamer and may need extra plugins; spell-check and encoding auto-detection depend on optional packages.

Alternatives

For a broader choice of subtitle tools, browse Subtitle Software.

• Editsub is worth considering if you want web or macOS access as well as Linux and Windows, and can work within its free plan's 10 subtitle files or paid credit allowance.
• Jubler is another free Linux desktop editor; choose it if macOS or Windows support matters and VLC-based video preview and audio waveform fit your workflow.
• Subtitle Edit is a free, open-source option for readers considering Windows, macOS or Linux.
• Aegisub is a free, open-source alternative for Linux, macOS and Windows.
• SRTGen may suit web or API workflows; its free tier includes SRT, VTT and TXT export, with a five-minute screen-recording limit and 2 GB storage.
• Zubtitle is a web, iOS and Android option if you work with videos and can accept a free plan capped at two videos per month, with a watermark and resolutions up to 720p.
• GNOME Remote Desktop is a different kind of free Linux software, for remote desktop access rather than subtitle editing.
• GNOME Subtitles is another free Linux subtitle editor, specifically for GNOME.

Verdict

Choose Gaupol if you use Linux and want a free, format-flexible subtitle editor with translation, timing tools and video playback options. Its clearest advantage is that focused editing workflow without a license cost; look elsewhere if you need a current Windows installation or playback that does not rely on GStreamer setup.