Convert JSON
to SMI
Drop in a .json (JSON cue array) file, get a clean .smi (SAMI (Synchronized Accessible Media Interchange)) back. SAMI (Synchronized Accessible Media Interchange) is Microsoft's HTML-like caption format from Windows Media Player era. Still required by some Korean and Japanese broadcast pipelines. The conversion runs entirely in your browser — your captions never leave the page.
Frequently asked
Why convert JSON to SMI?+
JSON cue array is a structured array of `{ index, start, end, text }` objects — clean for any captions pipeline. SAMI (Synchronized Accessible Media Interchange) is built for legacy Windows Media workflows and certain Asian broadcast deliverables. 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.