Questions, answered

SRT and WebVTT fully — parse, convert, shift and edit. Plain-text transcript export works from either. ASS/SSA is on the Pro roadmap.

No. Files are read with the browser FileReader API and processed in memory. There is no upload endpoint.

Not yet — ASS support is planned for Pro. SRT and VTT cover the vast majority of workflows.

VTT cue settings (position, line alignment) are preserved on VTT→VTT operations but dropped when converting to SRT, which cannot represent them. That is a format limitation, not a bug.

No — burning requires video encoding, which needs ffmpeg.wasm or a server. SubCraft handles the subtitle files themselves.

Only what your browser can hold in memory — typically hundreds of MB of text, far beyond any real subtitle file.

Current version edits cue text and supports add/remove. Global timing shifts are handled precisely by the shifter tool.