Bilingual Subtitle Merge
Match the secondary subtitle to the primary timeline by maximum time overlap and append it as a second line, producing a bilingual subtitle file in SRT, VTT, or ASS.
Primary subtitle (timeline base)
Secondary subtitle (second language)
Output format
How to Merge Bilingual Subtitles
- 1Upload the primary subtitle (timeline base) and the secondary subtitle (second language).
- 2Choose the output format (SRT, VTT, or ASS).
- 3Click 'Convert Now' and wait for the conversion to complete.
- 4Download the merged bilingual subtitle file.
About Bilingual Subtitle Merge
Bilingual subtitles meet requirements including side-by-side reference for language learning, review for cross-border team collaboration, and original text reference for hearing accessibility. Two monolingual subtitle files can be obtained from different subtitle sites, adapting to usage requirements of various playback scenarios.
This tool uses the primary subtitle as the timeline skeleton. For each time segment in the primary subtitle, it matches the entry with the highest time overlap from the secondary subtitle, and appends the secondary text as a second line. Primary subtitle entries without a match remain monolingual, and unmatched secondary entries are discarded directly.
If there is a fixed time offset between the two subtitle files, you need to correct it with the timeline offset tool before merging. Output supports three formats: SRT, VTT, ASS. SRT has the widest compatibility, ASS supports adding custom styles later. Arrange the order of primary and secondary subtitles according to your requirements.
FAQ about Bilingual Subtitle Merge
How to align subtitles with inconsistent timestamps?
This tool uses the primary subtitle as the skeleton, and matches secondary subtitle entries by maximum time overlap. If there is a fixed offset between the two subtitle files, you need to correct it with the timeline offset tool before merging.
How to choose primary/secondary order and output format?
Set the subtitle that needs to be placed on the top line as the primary subtitle, and the one on the bottom line as the secondary subtitle. Available output formats are SRT, VTT, ASS. SRT has the widest compatibility, and ASS supports adding custom styles later.
What is the maximum single file size limit?
The maximum single file upload size for this tool is 50MB, and only one file can be processed per conversion. This service is free of charge, output files have no watermark, and no account registration is required to use it.
Will user files be stored?
Conversion is completed on the server side. Files are uploaded to the server via HTTPS, and the server immediately deletes both the source file and the output file after conversion is complete. No files are stored.