My subtitles are always 2 seconds late. What do I use?

Enter -2s in Offset and click Apply shift. Use a positive value such as +1.5s when subtitles appear too early.

The start is in sync but the end drifts. Why?

The subtitles were timed for a different frame rate or a different cut. Try Convert fps (often 23.976 → 25), or use Two-point sync with the real times of the first and last lines.

Can I shift only part of the file?

Yes. Set From cue # to the first cue that is out of sync — useful when an intro or ad break was added mid-video.

Does it convert SRT to VTT?

Yes. Choose SRT or VTT in the Output panel. Timestamps, header and numbering are rewritten for the chosen format.

What does Remove [SDH] do?

It deletes hearing-impaired descriptions in brackets or parentheses, speaker labels like JOHN: and music notes, then drops cues that become empty.

Are my files uploaded?

No. Subtitles and the optional preview video are read and processed only in your browser.

SRT & VTT Subtitle Time Shifter & Editor

Shift subtitle timing, fix drift and fps mismatch, edit cues and convert SRT ↔ VTT.

Support

Works Offline

Privacy First

No Login

No API

File API

HTML5 Video

TextTrack

Load subtitles

Drop an .srt or .vtt file, or paste the text. Nothing leaves your browser.

Drop a file here

SRT or WebVTT, any size

Cues

Ends at

00:00:09,000

Overlaps

Invalid timings

Shift & resync

Offset+1.5s, -800ms, -00:01:20

From cue #

Timed for (fps)

Video is (fps)

Two-point sync — fixes drift that grows over time

First line: subtitle time

First line: real time

Last line: subtitle time

Last line: real time

Clean up text

Find

Replace with

Regex

Cues left empty after cleaning are removed and the rest renumbered on export.

Preview with your video

Optional — the video plays locally with the current subtitles on top.

Drop a file here

MP4 or WebM — stays on your device

Cues (3)

Edit times or text directly. Click # to jump the video there.

#	Start	End	Text
			[MUSIC PLAYING] Welcome back to the show.
			<i>Tonight we test subtitle sync.</i>
			JOHN: Downloaded from example-subs.com

Output

1
00:00:01,000 --> 00:00:03,200
[MUSIC PLAYING]
Welcome back to the show.

2
00:00:03,600 --> 00:00:06,000
<i>Tonight we test subtitle sync.</i>

3
00:00:06,400 --> 00:00:09,000
JOHN: Downloaded from example-subs.com

About the SRT & VTT Subtitle Time Shifter & Editor

Load an .srt or .vtt file and fix out-of-sync subtitles: shift every cue (or from a chosen cue onward) by a fixed offset, convert between 23.976, 24, 25 and 29.97 fps, or use two-point sync to correct drift that grows over the film. Clean hearing-impaired tags, formatting and ad lines, edit cues inline, preview against your own video and export SRT, VTT or a plain transcript — all inside your browser.

Popular uses

subtitle time shifter
srt time shifter
fix subtitle sync
resync srt
subtitle delay
srt to vtt
vtt to srt
subtitle fps converter

Examples

Subtitles 2 s late

00:00:03,000 --> 00:00:05,000 · offset -2s

Output

00:00:01,000 --> 00:00:03,000

PAL video, film subs

subs timed at 23.976 fps → video at 25 fps

Output

All cues scaled by 0.95904 — drift removed

Format convert

movie.srt

Output

movie.vtt with WEBVTT header and dot milliseconds

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Play M3U8 (HLS), MP4, WebM and local video files right in the browser.

Video Editor

Video & Media

Edit video with a live preview: visual trim timeline, aspect crop, colour, text overlay and background music — export MP4, WebM or GIF in your browser.

Video Format Converter

Video & Media

Convert video between MP4 and WebM with resolution control.

Video to Audio Extractor

Video & Media

Extract the soundtrack from a video and save it as WAV or Opus.

Video Resizer & Cropper

Video & Media

Resize or crop video to 9:16, 1:1, 4:5 and other social presets.

Frequently asked questions

How to fix out-of-sync SRT and VTT subtitles in your browser
Fix subtitles that are early, late or drift over time: offset shifts, 23.976 vs 25 fps conversion, two-point sync, SDH cleanup and SRT ↔ VTT conversion — without uploading anything.

Version 1.0.0 · Updated 2026-10-19 · Runs entirely in your browser

SRT & VTT Subtitle Time Shifter & Editor

About the SRT & VTT Subtitle Time Shifter & Editor

Popular uses

Examples

Keyboard shortcuts

Related tools

Video Trimmer & Cutter

Online Video Player (M3U8 / HLS)

Video Editor

Video Format Converter

Video to Audio Extractor

Video Resizer & Cropper

Frequently asked questions

My subtitles are always 2 seconds late. What do I use?

The start is in sync but the end drifts. Why?

Can I shift only part of the file?

Does it convert SRT to VTT?

What does Remove [SDH] do?

Are my files uploaded?

Read more