Subtitle Merge Tool
Combine two subtitle files in the way you need. Create bilingual subtitles that show two languages together – ideal for language learning – by matching each cue of the first file with the overlapping cues of the second. Append a second file after the first, for films split into two parts. Or combine both files and sort all cues by time, for example captions and sign translations.
- Runs in your browser
- No sign-up
- Free to use
How to use Subtitle Merge Tool
- Paste or open the first subtitle file in the main input.
- Paste or open the second file in the field above.
- Choose bilingual, append or combine.
- Merge and download the result.
Subtitle Merge Tool features
Bilingual mode
Two languages in every cue.
Append mode
Part 2 shifted to follow part 1.
Combine mode
All cues sorted by time.
Italic second language
Easy to tell apart.
Overlap warnings
Reports cues that do not match.
Private
Runs in your browser; nothing is uploaded.
When to use Subtitle Merge Tool
- Learning a language with native and target subtitles.
- Joining CD1 and CD2 subtitles of a split film.
- Adding forced subtitles to a full subtitle track.
- Combining captions from two sources.
Subtitle Merge Tool FAQ
How are cues matched in bilingual mode?
For each cue of the first file, the cues of the second file that overlap it in time for at least 30% of the shorter cue are added below the text.
Why do few cues match?
The files are probably timed for different versions of the video. Synchronise them first with the Subtitle Time Shifter.
Where does part 2 start in append mode?
One second after the last cue of part 1, or at the time you enter, for example the length of the first video file.
Will players show two lines of text?
Yes. Bilingual cues simply have more lines; keep them short for readability.
Which formats are supported?
SRT and WebVTT (.vtt), detected automatically. Open a file or paste the text.
Is my file uploaded?
No. Everything happens in your browser.
Three ways to merge subtitles
Merging subtitle files sounds simple, but it can mean different things. Language learners want two languages at once. People with a film split across two files need one continuous file. Others want to add a second track, such as translations of on-screen signs, to an existing one. The merge tool supports all three.
Bilingual mode keeps the timing of the first file and adds text from the second. Because two translations are rarely segmented identically, the tool does not require exact matches: any cue of the second file that overlaps a cue of the first for a meaningful share of its duration is attached. Showing the second language in italics makes the two easy to tell apart.
Append mode moves the second file in time so it begins after the first. By default it starts one second after the last cue of part 1; if you know the exact length of the first video file, enter it for perfect timing. Cue numbers continue seamlessly.
Combine mode simply joins both lists and sorts them by start time. Overlapping cues are reported, because many players display them together.
All merging happens in your browser.