Free browser-local tool
Subtitle Merger
To merge subtitles, append two to ten same-format SRT or basic VTT files in the exact order you choose.
SRT or basic VTT · 2 to 10 files · 2 MB combined
Files stay in your browser. Nothing is uploaded.
Selected files
0 of 10 files
Use zero for a continuous append, or up to three decimal places.
Result
Your current output and download actions will appear here.
Related free subtitle tools
How to merge subtitle files
- Add two to ten same-format files.
- Check the order and choose an optional gap.
- Merge, review the facts, and download one subtitle file.
Example
The sample loads opening.srt and closing.srt. At a zero-second gap, the second file starts exactly when the first file's maximum end is reached.
What is preserved and what changes
Cue text, relative timing, valid overlap, and selected order are preserved. Later files receive one constant time offset; SRT cue numbers are regenerated.
Limitations
This is sequential append only. It does not overlay, interleave, deduplicate, cross-convert, or synchronize subtitles to media.
When to use the subtitle merger
Episode and segment merging
When a long project is delivered as several subtitle files — one per episode, chapter, or work session — the subtitle merger appends them in the order you choose. Each file keeps its own cue timing; the next file starts after the selected gap, so the result is one continuous subtitle file for review and delivery.
How the merge is deterministic
When you merge subtitles, the operation is sequential and deterministic: files are appended in your selected order, later files receive one constant time offset, SRT cue numbers are regenerated, and conflicting VTT identifiers are renamed. You can reorder the files before merging, and the output always follows the order you see in the list. The tool does not reorder, deduplicate, or recalculate timing on its own, so the output matches exactly what you selected — no surprises.
Format and file-count rules
The subtitle merger accepts two to ten files, and every file must use the same detected format, SRT or basic VTT. The same-format rule exists because a merge is a pure append: cross-converting formats would be a different operation, and mixing them could silently change how cue numbers and identifiers behave. Whether you combine SRT files or VTT files, they must share one format.
When not to use it
This subtitle merger is for sequential append. It is not for bilingual track overlay, where you want two parallel language tracks, and it is not for overlapping timelines, where cues from different files share the same time range. For those jobs, keep the tracks as separate files or rebuild timing with Script + Audio.
Subtitle Merger FAQ
Can I merge SRT and VTT together?
No. Every selected file must use the same detected format.
Can I add the same subtitle file twice?
Yes. Repeated files are intentional and stay in the selected order.
Does this synchronize subtitles to audio?
No. It only appends files using their existing cue timing and your selected gap.
Can I merge files with different formats?
No. Every selected file must use the same detected SRT or basic VTT format, because a merge is a sequential append and does not cross-convert.
Why can I merge only two to ten files?
The two-file minimum guarantees a real merge, and the ten-file cap keeps the browser-local operation predictable and reviewable. Long series can be merged in several passes.
Does the merger fix overlapping cues?
No. It appends files using their existing cue timing and your selected gap. If source cues overlap, review the merged file with the subtitle checker before delivery.
Can I add the same file twice?
Yes. Repeated files are intentional and stay in the selected order — for example, when one segment appears in two parts of a program.
What does the gap do?
The gap is a constant offset added before each later file. Use zero for a continuous append or a small positive value to separate chapters cleanly.
Can I merge files in several passes?
Yes. Merge the first batch, download the result, and add it to the next batch. Because the append is deterministic, multi-pass merging keeps the same order and offsets.
What happens to VTT cue identifiers?
Conflicting VTT cue identifiers are renamed so the merged file stays valid; the wording and timing are not changed.
Can I combine SRT files from different tools?
Yes. As long as every file is detected as the same SRT or basic VTT format, files from different editors merge in your chosen order.
How do I merge subtitles with a gap?
Add the files in order and set a positive gap; each later file starts after the previous file's maximum end plus the gap.
Is the merged file ready to upload?
The merged file is structurally valid, but review it with the subtitle checker first: overlaps, line length, and reading speed still need a human-quality pass before delivery.
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