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Subtitle Merger

Join two subtitle files end to end, or stack two languages into bilingual cues.

Merging subtitles serves two purposes: stacking two languages into bilingual cues for language learning, or joining files for a video split across parts. Bilingual merging pairs cues by timing overlap rather than by index, because translated files rarely share the same cue boundaries.

Runs in your browser
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Why do bilingual subtitles need timing overlap matching?

Because a translation rarely breaks its sentences in the same places as the original, so cue 5 in one file may span cues 5 and 6 in the other. Pairing by index would misalign the languages; pairing by overlap does not.

How to use the subtitle merger

  1. 1Enter or paste your first subtitle file.
  2. 2Enter or paste your second subtitle file.
  3. 3Choose the combine by.
  4. 4Set the offset for the second file.
  5. 5Enter or paste your separator between languages.
  6. 6The result appears immediately — copy or download it.

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Put the working subtitle merger on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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