Convert ASS
to iTT
Drop in a .ass (Advanced SubStation Alpha) 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 ASS to iTT?+
Advanced SubStation Alpha is the heavily-styled subtitle format used by Aegisub and the fansub community. 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?+
Most styling drops in this direction. ASS supports inline styling and iTT doesn't, so override codes, cue tags, and positioning attributes are stripped. Timing and text always survive.
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.