Can this tool fix out-of-sync audio subtitles?

Yes! Use the Time Shift offset input to shift all timestamps forward or backward by exact seconds or milliseconds.

HomeToolsSubtitle Converter

SRT ⇄ VTT & Sync

Subtitle Converter (SRT ⇄ VTT) & Time Shifter

Convert video subtitles between SRT and WebVTT formats, fix audio sync delays with positive/negative time offsets, and copy or download cleanly.

Subtitle Converter (SRT ⇄ VTT) & Time Shifter

Convert between SubRip (.srt) and WebVTT (.vtt) files and shift audio synchronization in milliseconds.

Target Format:

Time Shift (Seconds):

Source Subtitles (SRT or VTT)

Formatted VTT OutputOriginal Timing

WEBVTT - Converted via DocSwift Subtitle Engine

1
00:00:01.000 --> 00:00:04.500
Welcome to DocSwift - 100% private document tools.

2
00:00:05.200 --> 00:00:08.800
All your processing happens directly inside your web browser.

3
00:00:09.100 --> 00:00:13.000
Zero bytes are ever uploaded to any third-party server.

Bidirectional SRT ⇄ WebVTT Conversion

Millisecond Audio Time Shifter

1-Click Copy and File Download

Valid HTML5 <track> Standards

How to Use Subtitle Converter (SRT ⇄ WebVTT) & Time Shifter (Step-by-Step Guide)

No software installation required. Complete your task in 3 easy steps directly in your browser.

Paste or Upload Subtitle

Paste subtitle text or load existing .srt or .vtt subtitle captions.

Choose Target Format & Sync Offset

Select SRT or WebVTT format and apply a ±time shift if audio is out of sync.

Copy or Download

Copy converted subtitles or download the formatted .srt / .vtt file directly.

How helpful was this tool?

Rated 4.9 / 5 by 3,420+ users worldwide

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Got Questions?

Frequently Asked Questions

SRT (SubRip) uses comma separators for milliseconds (00:00:01,500), while WebVTT uses dot separators (00:00:01.500) and begins with a "WEBVTT" header for HTML5 video tags.