File compatibility

Import

Format	Becomes
CSV / TSV (auto-detected)	Table
Parquet	Table
JSON / JSONL	Table
gzip of the above	Table
XLSX	Editable sheets

Imports are streamed and reviewed in a side pane with column types and samples before commit. Drag and drop or pass a path on the command line.

Export

Source	Formats
Any table or filtered view	CSV, Parquet, JSON lines
Sheets	XLSX, with a report of anything XLSX cannot hold

XLSX round-trip

Formatting (bold, italic, underline, strikethrough, sizes, colours, borders, alignment, wrap, number formats, merged cells) and layout (frozen rows and columns, sizes, hidden rows and columns) are kept through XLSX import and export.

Storage

Every workbook is a DuckDB file plus sheet data in a plain directory (--data-dir, default ./alephgrid-data). Nothing is uploaded anywhere: backups are file copies, covered in the operations guide.