How to merge and split subtitles for edited videos

Merge subtitles with the correct offset

Suppose the first video part lasts 90 seconds, but its final caption ends at 86 seconds. The second part begins at 90 seconds in the combined video. Its first caption at 2 seconds should therefore start at 92 seconds. Adding only 86 would make that caption four seconds early.

Add both files to Merge Subtitles. Leave the first offset at zero and set the second to 90. If two tracks already refer to the same full video, leave both offsets at zero. The tool orders the cues and keeps repeated or overlapping text; it does not align translations into bilingual pairs.

Part 1: offset 0 seconds
Part 2: offset 90 seconds

Part 2 cue before: 00:00:02,000 --> 00:00:05,000
Combined cue:     00:01:32,000 --> 00:01:35,000

• Merge subtitle files with offsets

Split SRT or VTT at the video cut

Enter the same cut time used in your video editor. At a cut of 90 seconds, captions that end by 90 belong to Part 1. Captions starting after 90 belong to Part 2. A caption spanning 89–92 seconds appears in both outputs: 89–90 in the first, and 0–2 in the second when its timeline is reset.

Keeping the words on both sides avoids silently losing part of a crossing caption. Review that cue against the video: if the sentence itself needs splitting, edit each exported part manually rather than assuming which words occur before the cut.

• Split subtitles at a chosen time
• Edit a caption that crosses the cut

A timeline reset should preserve initial silence

Resetting Part 2 subtracts the cut time from all of its timestamps. It does not force the first caption to begin at zero. If the cut is at 90 seconds and the next person starts speaking at 93, the new clip should still have three seconds before that caption appears.

Turn off Reset second part to zero only when you want the second file to keep the original recording's timestamps. Neither option cuts or rewrites your video; the output is a separate caption file.

Check synchronization after the edit

Play a clear phrase near the start, the join or cut, and the end. A constant error calls for a time shift. A known playback-speed change may need frame rate conversion. Missing scenes or several different edits require individual or section adjustments, not one global multiplier.

1. Check that each subtitle file is paired with the correct video part.
2. Check crossing captions and any overlap notes against the actual playback.
3. Download all parts before leaving the page; the tools do not save a cloud copy.

• Shift every caption by a fixed amount
• Retime captions for a known playback rate change