OTTSub - Subtitle Sync for Netflix

Adjust Netflix subtitle timing and enjoy dual subtitles with intuitive keyboard shortcuts and controls.

Having trouble with out-of-sync subtitles or looking to learn a language with simultaneous dual subtitles on Netflix? OTTSub provides the most seamless, responsive, and lightweight subtitle synchronization and dual subtitle experience built directly for the Netflix player. [Key Features] 1. Ultra-Precise Primary & Secondary Subtitle Sync - Live visual display and independent fine-tuning for both Primary and Secondary subtitle sync offsets. - Accurate 0.1s (100ms) sync slider and convenient keyboard shortcuts without conflicting with native Netflix controls. - Keyboard Shortcuts: * [ / ] : Adjust primary subtitle sync by ±0.1s * \ : Instantly reset primary sync to 0.0s * Alt + [ / Alt + ] : Independently adjust secondary subtitle sync by ±0.1s * Alt + \ : Instantly reset secondary sync to 0.0s * Alt + D : Toggle dual subtitles ON / OFF * Alt + L : Toggle subtitle position lock ON / OFF 2. True Independent Dual Subtitles - Displays Primary (original spoken audio) and Secondary (translation) subtitles concurrently in dedicated upper and lower slots. - Smart credits detection with adaptive top collision avoidance. - Stable split-baseline layout preventing vertical jitter when subtitle lines change length. 3. Independent Styling & Contrast Background Boxes - Independent font size scaling (60% to 140%) for primary and secondary subtitles to establish ideal visual hierarchy. - Four curated high-contrast color presets (White, Yellow, Mint, Green) selectable per language track. - Independent semi-transparent black background box for primary and secondary subtitles to ensure sharp legibility in bright backgrounds. - Independent line spacing (steps 0 to 6) and vertical position offsets (-50px to +50px). 4. 100% Privacy & Lightweight Performance - Zero telemetry, zero tracking, zero external network requests. - Completely runs locally within your browser with zero collection of personal data or viewing history. - Built with high-performance CSS containment and Dirty Checking for zero video frame drop.