Runs in your browser

Subtitle Timeline Editor

Edit subtitle text and timing on a visual timeline. Import SRT or VTT, preview with video, and export when your captions are ready.

Your files stay privateSRT · WebVTT · MP4 · MOV · WebM · MKV · AVI

Drop an SRT, VTT, or video file anywhere in the editor

Sample project

4 cues · All changes are local

Preview without a video

Add a video to sync captions while you edit

Welcome to today’s video.

00:0201:00

TimelineSubtitles

Timeline zoom

00:0000:0500:1000:1500:2000:2500:3000:3500:4000:4500:5000:5501:00

Subtitles

Drop a subtitle file here

SRT or VTT · processed locally · 4 cues

Shortcuts
Space play/pause · ←/→ seek · Shift + ←/→ seek 1s · Delete remove cue

Supported formats
Import SRT and WebVTT subtitle files. Optional video preview accepts MP4, M4V, MOV, WebM, MKV, and AVI when your browser can decode the codec.

Subtitle editing guide

Edit subtitles online with a visual timeline

Fix timing, rewrite captions, and preview every change against your video without installing desktop software. The editor reads common subtitle files locally and exports a clean file for your next video workflow.

How to edit a subtitle file

Import your files

Choose an SRT or VTT file. Add a video when you need to check sync against the original audio.

Adjust text and timing

Select a caption, edit its text, enter precise timecodes, or drag the caption block on the timeline.

Export and reuse

Download SRT for most editors or WebVTT for web video players. Continue with the video subtitle tool when you need burned-in captions.

Supported subtitle and video formats

Import SRT and WebVTT subtitle files. Optional video preview accepts MP4, M4V, MOV, WebM, MKV, and AVI when your browser can decode the codec. Timecodes keep millisecond precision when you export.

SRTWebVTTMP4M4VMOVWebMMKVAVI

Common use cases

Fix subtitle sync

Move captions earlier or later when the subtitle track is out of sync with the dialogue.

Clean up a transcript

Correct typos, split long captions, and make line breaks easier to read on mobile screens.

Prepare captions for publishing

Use SRT for editing software and WebVTT for HTML5 players, courses, documentation, and help centers.

Private by design

Subtitle and video files are read with browser APIs and kept in temporary memory on this device. Nothing is uploaded to MediaKit; closing the page releases the local object URLs.

Subtitle editor FAQ

Can I edit subtitles without a video?

Yes. Import an SRT or VTT file and edit the timeline with the sample duration. Add a video only when you want visual or audio sync checking.

What is the difference between SRT and WebVTT?

SRT is widely accepted by desktop video editors and media platforms. WebVTT is designed for the web and supports browser text tracks. Both keep caption text and timing.

How precise can the timing be?

Timecodes support milliseconds. You can type seconds or HH:MM:SS.mmm in the timing fields, then use the timeline for quick visual adjustments.

Does this burn subtitles into the video?

No. This page exports a subtitle file. Use the related video subtitle tool when you need captions rendered into every video frame.

Are my files uploaded?

No. This editor runs in your browser. Your source video and subtitle file stay on the current device and are not sent to a server.