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Subtitle Time Shifter & Sync Fixer

Video & Subtitles

Shift .SRT and .VTT timestamps forward or backward with exact millisecond precision and live split-screen preview.

Subtitle Time Shifter & Sync Fixer

Shift .SRT and .VTT timestamps forward or backward with exact millisecond precision and live split-screen preview.

3/3 Free Daily Uses
Tool Overview & Guide

What is Subtitle Time Shifter & Sync Fixer?

Fix out-of-sync subtitles for movies, series, YouTube videos, and presentations in seconds. Shift SubRip (.SRT) and WebVTT (.VTT) timestamps forward or backward by exact milliseconds with side-by-side before/after preview. 100% in-browser with zero cloud uploads.

Technical Specifications & Supported Formats
Processing Engine:FFmpeg WebAssembly (WASM 64-bit Client Engine)
Privacy & Security:100% In-Browser (Zero File Upload)
Supported Formats:MP4, WebM, MKV, AVI, MOV, FLV, 3GP, GIF
Max File Limit:2048 MB (2 GB)

How to use Subtitle Time Shifter & Sync Fixer

3 simple steps to complete your task directly in your browser:

  1. Upload Subtitle File

    Drag & drop your .srt or .vtt subtitle file into the upload zone or browse from your device.

  2. Adjust Time Offset

    Use quick +/- buttons (0.5s, 1.0s, 5.0s) or type an exact millisecond offset. Enter positive values if subtitles appear too early, or negative values if they appear too late.

  3. Inspect Split-Screen Preview

    Examine the real-time before and after timestamp comparison table to verify synchronization across initial cues.

Common uses

  • Movie & Streaming Fans: Fix audio delay sync mismatches when playing foreign films in VLC, Plex, or media centers.
  • Video Editors & Content Creators: Retime translated subtitle tracks when editing video cut durations.
  • Language Translators & Subtitlers: Adjust caption cue points between different video frame rate cuts (e.g. 23.976fps vs 25fps).
  • Accessibility Coordinators: Repair caption drift on online lectures and webinar recordings.

Why choose VersaTools

100% private

Your files are processed inside your browser and are never uploaded to a server.

Free, no account

No sign-up, no watermark, no paywalled “premium” tier. Just open a tool and use it.

Instant

No upload, no queue, no server round-trip — work starts the moment you drop a file.

Runs in your browser

Built on open web standards. Works on any modern desktop browser, nothing to install.

No upload size caps

Nothing leaves your device, so there’s no server file-size limit — only your machine’s memory.

Yours to keep

Results download straight to your device in clean, standard file formats.

Frequently asked questions