FFsubsync

Automatically synchronizes subtitle timing to video, in-browser or via command line.

Webfree

A free tool that automatically re-syncs subtitle files that are offset or drifting from their video, usable directly in the browser with no install or as a command-line tool. It detects speech in the reference audio or video to realign subtitle timing, and can also sync against a correctly-timed reference subtitle file. Built for anyone dealing with mistimed subtitles.

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