What is the SRT Subtitle Timestamp Shifter?
Paste an SRT subtitle file and enter an offset in seconds (positive to delay, negative to advance). Every timestamp shifts by that amount. Fixes the most common subtitle sync problem in seconds.
The tool is part of the Calabi free tools hub — a collection of 99+ browser-based utilities for developers, designers, and content creators. Everything runs client-side: your files and data never leave your device.
How to use the SRT Subtitle Timestamp Shifter
- Step 1: Paste the SRT file content.
- Step 2: Enter an offset in seconds (e.g. 3.5 or -2).
- Step 3: Copy the shifted SRT.
The tool updates in real time as you interact with it. No button-clicking required for most tools — results appear instantly.
Example
SRT offset +3.5s → all timestamps shifted forward
Privacy & security
The SRT Subtitle Timestamp Shifter is designed with privacy as a hard constraint, not an afterthought:
- No upload: Your data is processed in your browser's JavaScript engine. No HTTP request is made to any server while you use the tool.
- No account required: The tool works instantly — no email, no sign-up, no cookie consent wall.
- No logging: Calabi does not log what you paste, upload, or generate. The server only delivers the HTML/JS page — it never sees your content.
- Open to inspection: Open your browser's network inspector while using the tool. You'll see zero outbound requests related to your data.
This architecture is particularly important for the Video & Media category of tools, where the inputs often contain sensitive or proprietary information.
Frequently asked questions
Does the SRT Subtitle Timestamp Shifter work with large video files?
Yes, within browser memory limits. Most modern browsers can handle video files up to several GB. The tool uses browser-native APIs and never uploads the file anywhere.
What video formats are supported?
MP4 (H.264/H.265), WebM (VP8/VP9), and MOV files work in most modern browsers. AVI and MKV support depends on your browser's built-in codec support.
Is the SRT Subtitle Timestamp Shifter free?
Yes, completely free with no sign-up required. The tool runs entirely in your browser.
Will the SRT Subtitle Timestamp Shifter work on mobile?
Yes. The tool works on any modern mobile browser (Chrome on Android, Safari on iOS). Large video files may be slower on mobile due to memory constraints.
About Video & media tools
The SRT Subtitle Timestamp Shifter is part of the Video & media tools category in the Calabi tools hub. Fix out-of-sync subtitles by shifting all timestamps in an SRT file forward or backward — in your browser. All tools in this category run entirely in your browser with no server involvement.