SubFlex - Smart Subtitle Controller & Sync

Control video subtitles with dynamic multi-point sync for cut scenes, speed adjustment, and floating dialogue scrubber.

SubFlex is the next-generation subtitle controller and synchronization tool for Chrome and Edge. Tired of subtitles that drift out of sync, or movies where YouTube/streaming cuts make the subtitles completely useless after the first scene? SubFlex fixes subtitle timing with visual feedback. 🌟 KEY FEATURES: ⚓ Cut-Scene Step Anchors (Category First!) Traditional subtitle extensions only support a single delay (+0.5s / -0.5s). The moment a song, opening logo, or scene is trimmed, normal subtitles break. With SubFlex, click "⚓ Sync Here" at any cut to lock dialogue to that exact scene! 📜 Visual Dialogue Scrubber Drawer Slide open the interactive transcript drawer. Search any spoken phrase, see real-time highlighted speech, and click any line to snap playback and subtitles into 100% sync. ⏱️ 2-Point Linear Speed Calibration Fix frame rate drift (23.976 FPS Film vs 25 FPS PAL drift) in two clicks. Mark Point 1 near the intro and Point 2 near the climax — SubFlex calculates the exact speed ratio automatically. 🎛️ Floating Cyberpunk HUD Controller A sleek on-player dock that lets you nudge timing, adjust font size/color, toggle subtitles on/off, or pause captions directly from the video player without leaving fullscreen. 🔍 16M+ Online Subtitles + Drag & Drop Drag-and-drop any local .srt or .vtt file onto the player, or search over 16 million subtitles online with 1-click streaming without downloading. 🛡️ 100% Private & Safe No analytics, no tracking, and zero personal data collection. Runs entirely in your browser memory.