# Subtitle Sync & Shifter

> Fix out-of-sync subtitles by shifting every cue, or stretching them for a frame-rate change.

Out-of-sync subtitles have two different causes. A constant offset means every cue is early or late by the same amount and needs shifting. Drift that grows through the film means the subtitles were timed for a different frame rate, and needs the timings stretched by a speed factor.

**URL:** https://convertto.tech/t/subtitle-shifter
**Category:** Audio & Video Tools (https://convertto.tech/c/media-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Enter or paste your subtitle file.
2. Choose the correction.
3. Set the shift by.
4. Choose the units.
5. Set the speed factor.
6. Set the apply from cue.
7. The result appears immediately — copy or download it.

## FAQ

### How do I know whether to shift or stretch?

Check the first and last lines. If both are out by the same amount, shift. If the first is nearly right and the last is out by many seconds, the frame rate differs and you need to stretch — start with 1.0427 or 0.9590, which cover the 23.976 and 25 fps mismatch.

## Related tools

- [Subtitle Converter](https://convertto.tech/t/subtitle-converter): Convert between SRT, WebVTT, ASS/SSA, MicroDVD and plain text.
- [Subtitle Merger](https://convertto.tech/t/subtitle-merger): Join two subtitle files end to end, or stack two languages into bilingual cues.
- [Transcript to Subtitles](https://convertto.tech/t/transcript-to-subtitles): Turn a plain transcript into timed SRT or WebVTT cues at a realistic reading speed.
- [Subtitle Quality Checker](https://convertto.tech/t/subtitle-quality-checker): Check subtitles against broadcast standards for reading speed, line length and duration.
- [Audio to Subtitles](https://convertto.tech/t/audio-to-subtitles): Generate timed SRT or WebVTT subtitles from an audio recording.
- [Subtitles to Plain Text](https://convertto.tech/t/subtitles-to-text): Turn an SRT, VTT or ASS subtitle file into a clean transcript.
- [Video to Subtitles](https://convertto.tech/t/video-to-subtitles): Generate timed SRT or WebVTT subtitles from a video, in your browser.
- [ROT13 & ROT-N Cipher](https://convertto.tech/t/rot13-rotn-cipher): Shift letters by any amount — ROT13, ROT47 and every rotation in between, with a full table.