Subtitle frame rate converter
Fix subtitles that slowly drift out of sync because they were timed for a different video frame rate. Your inputs stay in this browser tab.
Your result
A little input. A useful result.
Your result will appear here.How to use subtitle frame rate converter
Fix subtitles that slowly drift out of sync because they were timed for a different video frame rate. This free tool runs locally after you choose to start.
- Enter your own values, or start with the visible example.
- Adjust subtitles (srt, webvtt or lrc), subtitles were timed for (fps), your video plays at (fps) as needed.
- Choose the action button. Review the result, then copy text or download a file when available.
- Choose Clear all when finished to remove inputs and results from the interface.
Limits, without the small print.
Paste up to 1 MB of SRT, WebVTT or LRC text; open a subtitle file in any text editor to copy it. Times are kept to the millisecond, and your text never leaves this browser tab.
One job runs at a time. You can cancel it; jobs stop after 30 seconds. Browser and device capabilities affect performance.
Understand the safeguards →What this tool does
If subtitles start in sync but drift further off over the film, they were made for another frame rate. 25 to 23.976 is the usual fix for European subtitles on a North American video.
Example input
Subtitles (SRT, WebVTT or LRC): 1 00:00:01,000 --> 00:00:03,500 Hello, and welcome. 2 00:00:04,000 --> 00:00:06,500 Every tool runs in your browser. Subtitles were timed for (fps): 25 Your video plays at (fps): 23.976
Example result
1 00:00:01,043 --> 00:00:03,649 Hello, and welcome. 2 00:00:04,171 --> 00:00:06,778 Every tool runs in your browser.
Questions people often ask.
Does subtitle frame rate converter upload my data?
No. This tool processes your input inside your browser. Your text and files are not sent to an application server. The static host receives page and asset requests; see our privacy explanation.
Is this tool free for work and study?
Yes. No account, paid API, usage subscription or watermark fee is required. You remain responsible for your content rights and checking results. Hosting providers and their free tiers are separate from this open-source software.
What should I check before relying on the result?
Paste up to 1 MB of SRT, WebVTT or LRC text; open a subtitle file in any text editor to copy it. Times are kept to the millisecond, and your text never leaves this browser tab. Review important outputs against the source, especially financial, legal, identity, medical and research calculations.
What is the difference between SRT and VTT?
Both store timed text. SRT is the most widely supported format for video players and editors, while WebVTT (.vtt) is the standard for web video. The converters keep every time to the millisecond.
How do I open an SRT file?
An SRT file is plain text. Open it in Notepad, TextEdit or any text editor, copy everything and paste it into the tool, then use the Download button to save the result.
How do I add subtitles to a video?
Use Add subtitles to video to burn them into the picture, or load the SRT file in your video player or upload it next to your video on YouTube so viewers can switch them on and off.