CSV to Excel

Upload a CSV and Plotiq builds an OOXML .xlsx file in the browser with correct cell types — no Microsoft Office needed, no leading zeros stripped, no "1/2" auto-turned into a date.

Solves Excel's native CSV-import quirks in one conversion.

1. Upload or paste your CSV

Drop a .csv into the input pane. Plotiq parses it with RFC 4180 quoting rules, preserving leading zeros.

2. Review the typed preview

Plotiq previews which cells it will type as numbers, dates, or booleans before you export — catches mistakes early.

3. Download the .xlsx workbook

Output is a standard OOXML workbook that opens in Excel, Google Sheets, Numbers, and LibreOffice Calc.

Why does Excel strip leading zeros from CSVs, and does Plotiq fix it?

Excel's default CSV opener treats every numeric-looking cell as a number. Plotiq writes cells with leading zeros as text, so "007" stays "007".

Will the downloaded .xlsx open in Google Sheets or Numbers?

Yes. Plotiq emits a standard OOXML workbook — opens in Excel, Google Sheets, Apple Numbers, LibreOffice Calc, and any library that reads .xlsx.

Does the converter auto-detect dates?

Only when the cell unambiguously matches ISO / US / EU date formats and makes calendar sense. Fractions and gene names ("SEPT2") stay text.

Can I keep the first row as a bold header in Excel?

Yes. Toggle Bold Header on — the first row writes with a bold cell style, ready for filters and pivot tables on open.