Manual Chapter Marker Creator
Write video chapter markers and export an FFmetadata text file.
Work locally
Use the controls above to begin. Files stay on this device.
Results
How to use manual chapter marker creator
Select a local file if requested, or enter values and review them. Choose Process in browser, review the output and download it before leaving the page. If the browser cannot decode a file, the tool reports the limitation rather than uploading it elsewhere.
Method and accuracy
Add time and titles manually. This utility does not embed metadata or rewrite a video file. Processing occurs within device and browser limits; actual player compatibility can differ by format. No generated captions, speech transcription or AI enhancements are offered.
Related tools
Manual caption editor · Basic media inspector · Bitrate calculator
How this tool works
Write video chapter markers and export an FFmetadata text file.
What to check before sharing
This analysis uses browser APIs or sampled data, so it may not identify every stream, event or edge case. Treat results as diagnostic estimates and verify important findings in a full media player.
No AI or paid processing API. The site does not intentionally upload selected media. See privacy, current format limitations and browser processing explained.