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Load local subtitle files and display them over online videos. SubtitleX automatically synchronizes local subtitle files with same-language dialogue while you watch online videos. Load an SRT or VTT file, select the spoken language, and start Auto Sync. SubtitleX listens to a 15-second dialogue sample through Chrome Speech Recognition, finds matching subtitle text, and adjusts the subtitle timing. Key features: • Automatically synchronize same-language subtitles with spoken dialogue • Import local SRT and VTT subtitle files • Display subtitles over compatible HTML5 videos • Fine-tune subtitle timing manually in 0.5-second steps • Select Japanese subtitle words to view English meanings and readings • Process subtitle files and dictionary lookups locally For better synchronization, use Auto Sync during a dialogue-heavy scene with audible volume. If it cannot find a reliable match, try another scene or repeat the process. Auto Sync requires the film’s spoken language and subtitle language to be the same. It uses Chrome Speech Recognition and may require microphone permission. Compatibility may vary between websites. Some protected streaming players, embedded videos, or unusual video implementations may not be supported.
Aug 4, 2026
rating_count is the Chrome Web Store ratings count, not a written-review count.
Media assets
Screenshots and videos on the listing.
Has promo video
Whether the listing includes at least one video.
Languages
Declared language locales.
Developer website
Listing exposes a developer website URL.
Contact email
Listing exposes a contact email.
Keyword in name
Case-insensitive substring match in the name.
Keyword in description
Case-insensitive substring match in the description.
Keyword occurrences in description
Count of case-insensitive occurrences in the description.
Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
These are transparent listing completeness / keyword signals, not a prediction of Chrome Web Store search ranking.