Online Subtitle Time Shifter

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Operation: Amount:

Raw Subtitles (.SRT / .VTT)

Shifted Subtitles

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How to Use the Subtitle Time Shifter

Upload or Paste: Click the "Upload" button to load your .srt or .vtt file, or simply paste the raw subtitle text into the left text area.
Choose Operation: Select Add if the subtitles are appearing too early (this will delay them). Select Subtract if the subtitles are appearing too late (this will hasten them).
Set the Amount: Enter the exact time you want to shift by. You can choose to input the value in Seconds (e.g., 1.5 for one and a half seconds) or Milliseconds (e.g., 1500).
Shift Subtitles: Click the "Shift Subtitles" button to instantly recalculate all timestamps.
Save and Use: Click "Save File" to download the updated subtitle file to your device, ready to be played with your video.

Core Features

Universal Support: Fully supports the two most popular subtitle formats: SubRip (.srt) and WebVTT (.vtt).
Precision Adjustments: Adjust subtitle sync down to the exact millisecond for perfect audio-visual matching.
Client-Side Processing: Your subtitle files are processed instantly inside your web browser. No files are uploaded to our servers, guaranteeing your privacy.
Format Retention: Safely preserves all your original subtitle text, HTML formatting tags (like <b> or <i>), and WebVTT positioning data.

Benefits of Fixing Subtitle Sync

Nothing ruins a movie night faster than reading a punchline three seconds before the actor actually says it. Subtitles often become desynchronized due to minor variations in video cuts, different broadcasting frames per second (FPS), or ripped versions of media. Instead of searching the web for a perfectly matched subtitle file, our tool allows you to manually correct the offset in seconds, saving you time and frustration.

Common Use Cases

Home Theater Enthusiasts: Fixing out-of-sync subtitles for Plex, Jellyfin, or Kodi media servers.
Video Editors: Shifting caption tracks to align with a newly trimmed video edit before uploading to YouTube.
Language Learners: Adjusting dual-language subtitles so they display perfectly on screen alongside the dialogue.
Content Creators: Bulk-shifting auto-generated captions that drifted slightly out of sync during export.

Shift Examples

Here is an example of what happens to the timestamps when a +2.500 Second (Delay) shift is applied:

Format	Original Timestamp	Shifted Timestamp (+2.5s)
SRT	`00:01:10,000 --> 00:01:15,000`	`00:01:12,500 --> 00:01:17,500`
VTT	`01:10.000 --> 01:15.000`	`01:12.500 --> 01:17.500`

Pro Tips for Perfect Syncing

Identify the Offset: Pause your video exactly when an actor begins to speak. Look at the current video timestamp, then find the corresponding dialogue in your subtitle file. Subtract the two numbers to find your exact shift amount.
Drifting Sync vs Fixed Offset: This tool fixes a fixed offset (e.g., subtitles are consistently 2 seconds late for the entire movie). If the subtitles start in sync but slowly drift out of sync over time, you have a framerate mismatch (e.g., 23.976 fps vs 25 fps), which requires a framerate converter, not a simple time shift.
Negative Limits: You cannot shift a subtitle timestamp below 00:00:00,000. If you subtract too much time, any timestamps that drop below zero will be safely clamped to zero.

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Frequently Asked Questions (FAQ)

Why are my subtitles out of sync?

This usually happens if the subtitle file was created for a different cut of the video (like an Extended Edition vs a Theatrical Release), or if the video has a different opening studio logo that adds extra seconds to the beginning.

Does this tool support WebVTT (.vtt) files?

Yes. The tool automatically detects WebVTT formatting (which uses periods for milliseconds, e.g., 00:00.000) and preserves VTT-specific metadata and alignment tags.

Is my subtitle file uploaded to your server?

No, all time calculations and formatting happen locally in your web browser. Your subtitle text and data are completely private and are never sent over the internet.

How do I know if I need to Add or Subtract?

If you see the text on screen before the actor speaks, the subtitles are too early. You need to Add (delay) time. If you hear the actor speak and the text appears late, you need to Subtract (hasten) time.

Will this fix subtitles that slowly drift out of sync?

No. If the first line is perfect, but the last line of the movie is off by 10 seconds, that is a framerate stretching issue. This tool only applies a flat time shift to the entire file.