Import and export — Sheetwrite

Sheetwrite reads and writes XLSX through the optional @sheetwrite/xlsx package, and CSV and TSV through core. Each page says what a format keeps and what it reports as a fidelity warning.

XLSX import

Import workbook snapshots or rectangular tables with explicit fidelity warnings.

XLSX export

Download an active-sheet table or save a workbook with formulas and supported formatting.

CSV and TSV

Exchange plain table values without installing the optional XLSX package.

NewKept parts and round trips

Keep eligible unmodelled XLSX parts as original compressed bytes and surface losses after edits.

UpdatedLarge files and streaming

Read seekable files and write bounded chunks while retaining explicit XLSX resource limits.

NewLibreOffice compatibility

Understand the checked LibreOffice round trips, display fixes and known producer differences.

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