How do I edit SRT subtitle files online?

Upload your `.srt` file or paste text, edit subtitle text, adjust start/end timestamps, add or delete cues, preview against a video, and export your updated SRT file.

Can I adjust subtitle timing while watching video preview?

Yes. Upload a reference video to scrub along the timeline and synchronize subtitle cues with spoken dialogue.

Does the SRT editor fix formatting errors?

Yes. The editor validates standard timestamp syntax (`00:00:00,000 --> 00:00:00,000`) and repairs overlapping cues automatically.

NexLove Media

SRT Subtitle Editor & Visual Studio

Edit SubRip (.srt) and WebVTT (.vtt) subtitle files online with synchronized video preview, real-time CPS reading speed auditing, batch time shifting, overlap repair, and multi-format export.

TL;DR: SRT Subtitle Editor & Visual Studio is a 100% free browser-based media utility. Comprehensive client-side subtitle studio with live video sync preview, CPS speed auditing, batch time shifting, and multi-format export.

Select Subtitle File (.SRT / .VTT / .TXT)

Supports SubRip (.srt), WebVTT (.vtt), and text transcripts (100% private)

Understanding SRT Subtitle Editor & Visual Studio

Edit SubRip (.srt) and WebVTT (.vtt) subtitle files online with synchronized video preview, real-time CPS reading speed auditing, batch time shifting, overlap repair, and multi-format export. 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

\text{CPS} = \frac{\text{Character Count}}{T_{\text{end}} - T_{\text{start}}}, \quad \text{Optimal CPS} \le 17.0

Formula Variables Explained:
Calculates characters-per-second reading speed for each caption block to ensure viewers have sufficient reading time without eye strain.

Step-by-Step Worked Example

A 42-character subtitle displayed for 2.5 seconds has a reading speed of 16.8 CPS (Comfortable Reading Speed).

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 or paste text, edit subtitle text, adjust start/end timestamps, add or delete cues, preview against a video, and export your updated SRT file.
: Yes. Upload a reference video to scrub along the timeline and synchronize subtitle cues with spoken dialogue.
: Yes. The editor validates standard timestamp syntax (`00:00:00,000 --> 00:00:00,000`) and repairs overlapping cues automatically.

Embed This Tool

Add the live SRT Subtitle Editor & Visual Studio to your own website with this embed code:

<iframe src="https://nexlove.org/embed/srt-editor.html" width="100%" height="650" style="border:1px solid #e2e8f0;border-radius:12px" title="SRT Subtitle Editor & Visual Studio — NexLove" loading="lazy"></iframe>

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