Question 1

What does this tool do?

Accepted Answer

It stretches or compresses all SRT subtitle timestamps when a video has been sped up or slowed down.

Question 2

Which calculation modes are available?

Accepted Answer

You can calculate by duration, by speed, or by entering a manual factor. The tool also lets you set an anchor time in seconds.

Question 3

When should I use the By duration mode?

Accepted Answer

If the entire video was changed at a constant speed from start to finish, the “By duration” mode is the most accurate. The factor is new duration divided by original duration.

Question 4

What if only one part of the video changed speed?

Accepted Answer

This tool works best when the whole video is uniformly sped up or slowed down. If only one section changed, split the subtitle file by section and process each part separately.

Question 5

How can I export the result?

Accepted Answer

After syncing, you can preview the updated SRT, copy it, or download the output file with the default name sub_synced.srt.