Subtitle Resync

Permanently fix out-of-sync .SRT subtitle files

🎥 1. Upload Video (for preview)
📝 2. Upload .SRT File
Upload a video to see the preview

How to Resync Subtitles Online?

  1. Upload Video & Subtitles: Select your video file (MP4, WebM, etc.) and the out-of-sync .SRT file.
  2. Check Sync: Play the video to see when the expected dialogue happens versus when the subtitle appears.
  3. Adjust Timing:
    • If subtitles appear too early, click + Shift (Delay).
    • If subtitles appear too late, click - Shift (Advance).
  4. Fine Tune: Use the manual input for precise millisecond adjustments (e.g., -1.5s).
  5. Download: Click "Download Fixed SRT" to save the permanently corrected file.

About Subtitle Resync Tool

Frustrated with subtitles that don't match the audio? The Subtitle Resync Tool is the easiest way to fix out of sync subtitles srt files directly in your browser. No need to download complex software or manually edit timestamps.

Whether you are a movie enthusiast, anime fan, or language learner, our subtitle shifter online utility helps you perfectly align text with speech. Simply load your media, apply a time offset, and resync srt file permanent changes in seconds.

This tool works entirely on your device (client-side), ensuring your video and subtitle files remain private and secure. It's the ultimate solution to delay subtitles online tool searches, providing a quick fix for any synced video playback issues.

How to Resync Subtitles & Alignment Guide

Out-of-sync subtitles can ruin any movie or video. This free tool lets you adjust timing offsets and preview captions directly against your video before downloading the fixed SRT.

Step-by-Step Instructions

  1. 1

    Upload SRT Subtitle File

    Select or drag-and-drop your .srt subtitle file into the upload area.

  2. 2

    Load Video for Real-Time Preview (Optional)

    Attach your local video file to visually verify that subtitle lines match the spoken dialogue.

  3. 3

    Adjust Timing Offset

    Use the quick shift buttons (±0.1s, ±0.5s, ±1.0s) or type an exact millisecond offset until the subtitles sync with audio.

  4. 4

    Download Resynced .SRT File

    Click Download Resynced SRT to export your permanently corrected subtitle file ready for VLC, Plex, or TV players.

Key Features & Benefits

⚡

Live Video Preview

Play your video with active captions in the browser to confirm synchronization before saving.

🎯

Precision Micro-Adjustments

Adjust timestamps in 100ms, 500ms, or exact second increments for frame-perfect alignment.

🔒

100% Private & In-Browser

No file size limits and zero cloud uploads. Your movies and private video files remain completely on your machine.

📺

Universal Player Compatibility

Exported SubRip (.srt) files comply with standard formatting for smart TVs, VLC, MPC-HC, and streaming servers.

Frequently Asked Questions

How do I know whether to shift forward (+) or backward (-)?

If subtitles appear before the actor speaks, add a positive delay (+ seconds). If subtitles appear after dialogue has already occurred, add a negative offset (- seconds).

Are my videos or subtitles uploaded to a server?

No. Everything runs 100% locally in your web browser via HTML5 File and Blob APIs. No video or subtitle file is ever transferred across the internet.

Can I resync subtitles without uploading a video?

Yes! If you already know the offset from a media player like VLC (e.g. +1.2 seconds), upload just the SRT file, enter 1.2 in manual adjustment, and download the updated file.

Will this permanently fix the subtitles for smart TVs and media players?

Yes. The downloaded .srt file contains permanently rewritten timestamps (00:00:00,000) that work on smart TVs, Plex, Kodi, Netflix players, and all mobile devices without needing runtime adjustments.