How to use CSV to Excel
- Load CSV and choose its delimiter and header behavior.
- Review the bounded parsed table.
- Create and download the validated XLSX package.
CSV to Excel Converter
Convert CSV rows into a valid XLSX workbook with editable cells while preserving every value as text by default.
Private by design. CSV and JSON stay in browser memory in this tab. Nothing is uploaded, logged, saved, or executed.
Maximum 16 MB · 50,000 rows · 500 columns · 1,000,000 characters per cell.
All values remain text by default, preserving ZIP codes, long IDs, dates, leading zeros, quoted fields, and multiline cells. Formula-like prefixes are neutralized.
Add CSV data, then process it.
Create a real Excel workbook without silently changing ZIP codes, long IDs, dates, leading zeros, or quoted values.
How OpenFileTools processes it
Local processing, explicit choices.
One shared deterministic parser handles UTF-8, BOM, quoted fields, escaped quotes, embedded line breaks, and explicit delimiter modes. Cells render only as text, and output is created locally after review.
Questions, answered.
Will Excel change 00123 into 123?
The converter writes text cells, so leading zeros and numeric-looking identifiers remain visible.
Is the source uploaded?
No. Source data and generated output remain in browser memory in this tab.
Related guide
Read the related guide