DuoSubs

Dual-language subtitles on any video. Overlay multiple SRT tracks at once, each styled and positioned independently.

Two languages on screen at the same time. DuoSubs overlays your own SRT subtitle files on any HTML5 video on any site - and unlike normal players, it shows multiple tracks simultaneously. English on top, Vietnamese on the bottom. Japanese and English. Whatever pair you are learning. DUAL-LANGUAGE, MULTI-TRACK - Load two (or more) SRT files and see them together: one language at the top of the video, the other at the bottom. - Each track is fully independent: its own position (top, middle, bottom, plus pixel-precise X/Y nudging), its own font, colors, size, and timing. - Perfect for language learners: read the language you are studying while the translation stays in view. - Switch the active track with Alt+1..9. WORKS ON ANY VIDEO - Any site with an HTML5 video: streaming sites, embedded players, iframes, multi-player mirror pages. It attaches to the video you are actually watching. - Pick your .srt files in the popup, hit Apply, done. - Tracks and settings are remembered between sessions. STYLE EVERYTHING - 20+ fonts, text color and opacity, background color and opacity, size. - Per-track styling, saved automatically. STAY IN SYNC - Timing offset per track, adjustable live with buttons or Alt+, / Alt+. (hold Shift for 2-second jumps). Sync each language separately. FULLSCREEN THAT WORKS - Overlays and control panel stay visible in fullscreen. - Draggable on-video control panel; hide it with Alt+S. LOCAL FILES - The DuoSubs Viewer page plays a local video file (mp4, webm, mkv and more) with full dual-subtitle and fullscreen support. Drag, drop, watch. PRIVATE BY DESIGN - No accounts, no analytics, no data collection. Subtitles and settings are stored locally in your browser and never leave your machine.