Jubler is an open-source editor for creating, correcting and synchronizing text-based subtitles. It works with formats such as SubRip, SubStation Alpha, Advanced SubStation Alpha, SubViewer, MicroDVD and MPL2. Video preview, waveform tools and playback testing help check timing, while spell checking, translation mode and style editing support text work.

Jubler is an open-source editor for text-based subtitles, suited to people creating captions from scratch as well as those correcting or adapting existing files. It brings subtitle text and timing into an editing workspace, where entries can be reviewed, adjusted and checked alongside video. Its range of supported formats makes it useful for working with subtitles from different sources without first converting every file to the same type.

The editor opens and saves common formats including Advanced SubStation Alpha, SubStation Alpha, SubRip, SubViewer, MicroDVD, MPL2 and Spruce DVD Maestro. Subtitle entries can be added or revised, and their timing can be synchronized with a movie. A video preview based on FFmpeg helps check how subtitles appear against the current frame; waveform display and listening functions offer additional ways to inspect timing. When a compatible player is used, subtitles can be played for testing while edits are made, new entries are added during playback, or synchronization is corrected against the video.

For subtitle files that support them, Jubler provides style editing, including styles applied to a subtitle or individual characters. The graphical display allows subtitles to be moved and resized, while color marking helps distinguish entries during editing or playback. Spell checking can use a selected dictionary to catch text errors. A translation mode presents parent and child editors, supporting work on a translated subtitle alongside its source rather than treating the two texts as unrelated files.

Text handling is not limited to a single encoding: Jubler supports encodings available through the Java platform, including UTF-8, and lets users choose preferred encodings when opening localized subtitles. This is useful when files contain accented or non-Latin characters. The interface also supports internationalization through gettext utilities, and the program includes an automatic update feature. Its combination of timing tools, preview, text checking and translation functions supports both straightforward subtitle cleanup and more involved editing projects.

Jubler is free and open source, with versions available for Windows and other operating systems. On Windows 7 it can serve as a desktop tool for preparing, translating, synchronizing and reviewing subtitle files. Video preview functionality relies on FFmpeg support, and playback testing uses the MPlayer video player; the generic installer for other platforms does not include FFmpeg support. These dependencies matter when selecting an installation and setting up a workflow that includes in-editor video preview or playback.

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