Merge Subtitles

Bilingual subtitles for language learning

Dual-language subtitles are one of the most effective ways to learn a foreign language through film and television. By displaying both the original dialogue and a translation simultaneously, you can follow the meaning while absorbing natural sentence structure, vocabulary, and pronunciation cues in context. Research consistently shows that combining audio input with written text in two languages accelerates comprehension and retention far more than either subtitles or audio alone.

This tool merges two standard SRT subtitle files into a single file where each entry contains both languages. The primary subtitle text appears on the top line and the secondary text appears below it. Timing is matched by finding the secondary entry with the greatest timestamp overlap for each primary entry, so even if the two files segment dialogue slightly differently, the correct lines are paired together. The output is a valid SRT file that works in VLC, MPV, Plex, Kodi, and any other player that supports the format.

Common use cases include pairing English subtitles with Japanese, Korean, Spanish, French, German, Portuguese, Mandarin, or any other language combination. Many learners use bilingual subtitles to watch content in their target language while keeping a safety net in their native language. Over time, you rely less on the translation and more on the original text, building genuine reading speed and listening comprehension. Teachers also use merged subtitles to prepare classroom materials from authentic media.

Everything runs entirely in your browser. Your subtitle files are never uploaded to a server. There is no file size limit beyond what your browser can handle, and processing is near-instant for typical film-length files. Simply drop your two SRT files, click merge, and download the result.