Convert CSV
to IMSC
Drop in a .csv (Comma-separated values) file, get a clean .xml (Internet Media Subtitles and Captions) back. Internet Media Subtitles and Captions is the modern W3C streaming profile of TTML used by Netflix, Apple TV, and most streaming services. The conversion runs entirely in your browser — your captions never leave the page.
Frequently asked
Why convert CSV to IMSC?+
Comma-separated values is one row per cue with index, start, end, and text columns — opens in any spreadsheet. Internet Media Subtitles and Captions is built for streaming delivery to HLS / DASH manifests and modern OTT ingest. 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.