SRT Timestamp Shifter: Delay or Advance Subtitles

An SRT timestamp shifter moves every SRT time written as hh:mm:ss,mmm by a fixed number of seconds. The page shows the default example: two cues shifted by plus 2 seconds, so 00:00:01,000 becomes 00:00:03,000. A negative shift cannot go below zero.

Transcribe a recording

Send your voice message, audio or video to @potok_now_bot on Telegram and the text comes back in the chat.

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Files up to 2 GB · export to TXT, MD, DOCX, PDF, SRT and VTT · speaker labels and timestamps · about 30 languages

Key facts

Both times of every cue move together, so the length of each cue stays the same and only the start of the whole track changes.
The example page is static: it prints the original SRT and the shifted SRT side by side with a shift of 2 seconds, and has no input field.
The shifter looks for times written as hh:mm:ss,mmm with a comma. Times in WebVTT form, with a period, are left alone.
A result below zero is set to 00:00:00,000, so a large negative shift can make several cues start at the same moment.

Calculator

Default example: shifting every time by +2 seconds.

1
00:00:01,000 --> 00:00:03,500
Let's start the meeting.

2
00:00:04,000 --> 00:00:07,200
First, we'll review last week's results.

1
00:00:03,000 --> 00:00:05,500
Let's start the meeting.

2
00:00:06,000 --> 00:00:09,200
First, we'll review last week's results.

What Potok can do
Feature	Details
Where it works	Telegram bot @potok_now_bot; large files go through the bot's mini app
File size	Up to 2 GB
Export	TXT, MD, DOCX, PDF, SRT, VTT
Speakers and time	Speaker labels and timestamps can be switched on
Languages	About 30 languages with good published results; a few more with warnings
Translation	The transcript is not translated into another language
Dictation	A separate Potok desktop app lets you dictate text into any program; it recognises Russian speech

See the full list of languages, the tools and the glossary.

Frequently asked questions

How do I delay subtitles by two seconds?

Add 2 to every start and end time in the file. The example shows the first cue moving from 00:00:01,000 --> 00:00:03,500 to 00:00:03,000 --> 00:00:05,500.

How do I make subtitles appear earlier?

Use a negative number of seconds, which subtracts from every time. Any time that would fall below zero is set to 00:00:00,000.

Does the shift change the subtitle text?

No. Only the numbers in the time lines change. The cue numbers, the text and the blank lines between cues stay exactly as they were.

Can I shift a WebVTT file the same way?

The idea is the same, but this shifter reads the comma form of SRT only. Convert the WebVTT file to SRT first, or shift the times in the original by hand.

Why do shifted cues still drift out of sync?

A fixed shift fixes a constant offset only. If the delay grows through the video, that often points to a frame-rate or edit mismatch, which one fixed shift cannot correct.

Sources

Each source was opened by hand on the date shown. Pages change, so open the source if a detail matters to you.

SubRip and the .srt format (Wikipedia), Wikipedia · checked 2026-10-18
Subtitle (Wikipedia), Wikipedia · checked 2026-10-18

Try it on your own recording