DuoSubs

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.