How do I shift subtitle timing forward or backward to sync with video?

Upload your SRT file, specify a time offset in milliseconds or seconds (e.g. +1.5s to delay or -2.0s to advance), and download your perfectly synced subtitle file.

Can I sync subtitles when audio and text drift apart over time?

Yes. Use framerate time-stretching (e.g. 23.976 FPS to 25 FPS) to fix gradual subtitle audio drift.

NexLove Media

SRT Time Shift & Subtitle Sync Adjuster

Shift all subtitle timestamps forward or backward by milliseconds or seconds to fix audio sync delay without editing lines manually.

TL;DR: SRT Time Shift & Subtitle Sync Adjuster is a 100% free browser-based media utility. Synchronize out-of-sync subtitles by shifting all timecodes forward or backward.

Select .SRT File to Shift Timestamps

Shifts all timecodes forward (+) or backward (-)

Understanding SRT Time Shift & Subtitle Sync Adjuster

Shift all subtitle timestamps forward or backward by milliseconds or seconds to fix audio sync delay without editing lines manually. Designed for creators, video editors, audio engineers, web designers, and developers who need instant, high-precision processing without software installation, watermarks, or file uploads.

Mathematical Formula & Technical Methodology

t_{\text{new}} = \max(0, \ t_{\text{orig}} + \Delta t_{\text{shift}})

Formula Variables Explained:
Adds signed time offset $\Delta t$ across all cue start and end values.

Step-by-Step Worked Example

Shifting by +1.5 seconds (+1500ms) aligns late subtitles with audio dialogue.

100% Client-Side Privacy Guarantee

All media decoding, manipulation, calculations, and encoding execute locally inside your web browser using HTML5 Canvas, Web Audio API, WebCodecs, Web Crypto, and modern JavaScript engines. Zero server uploads, zero telemetry, and no registration required.

Frequently Asked Questions

: Upload your SRT file, specify a time offset in milliseconds or seconds (e.g. +1.5s to delay or -2.0s to advance), and download your perfectly synced subtitle file.
: Yes. Use framerate time-stretching (e.g. 23.976 FPS to 25 FPS) to fix gradual subtitle audio drift.

Embed This Tool

Add the live SRT Time Shift & Subtitle Sync Adjuster to your own website with this embed code:

<iframe src="https://nexlove.org/embed/srt-time-shift.html" width="100%" height="650" style="border:1px solid #e2e8f0;border-radius:12px" title="SRT Time Shift & Subtitle Sync Adjuster — NexLove" loading="lazy"></iframe>

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