Convert IMSC
to iTT
Drop in a .xml (Internet Media Subtitles and Captions) file, get a clean .itt (iTunes Timed Text) back. ITunes Timed Text is Apple's TTML 1.0 profile used by iTunes and Final Cut Pro. Strict XML with limited per-element styling. The conversion runs entirely in your browser — your captions never leave the page.
Frequently asked
Why convert IMSC to iTT?+
Internet Media Subtitles and Captions is the modern W3C streaming profile of TTML used by Netflix, Apple TV, and most streaming services. ITunes Timed Text is built for iTunes Connect ingest and Final Cut Pro caption tracks. Converting lets you take a file produced for one workflow and use it in the other without re-typing or re-timing anything.
Is timing preserved exactly?+
Yes. The converter only re-encodes the file structure — start and end times round-trip to within one millisecond.
Does any styling survive the conversion?+
Neither format carries styling, so there's nothing to lose. The text and timing transfer exactly.
Does this run on a server?+
No. The conversion is pure JavaScript running in your browser — files never upload anywhere. Works offline once the page is loaded.