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#013 · Spreadsheet Conversion Tool

CSV to Excel Converter

Convert CSV or TSV data into a real Excel workbook while keeping text-like identifiers safer from unwanted numeric conversion.

Office File Tool

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How to use this office tool

  1. Upload a CSV or TSV file.
  2. Choose whether to protect text values and set the header row.
  3. Convert the parsed table, review the preview, and download XLSX.

What this tool does

Parses delimited text, detects the delimiter, preserves rows as a table, and writes a new XLSX workbook with a bounded preview.

Delimited text → parsed rows → Excel worksheet → new XLSX Blob.

CSV stores values, not Excel formatting or formulas. Review dates, long numbers, and leading-zero identifiers.

Supported formats

Accepts CSV and TSV text files and produces XLSX. Quoted fields and embedded line breaks are parsed by Papa Parse.

InputOutput
XLSX, XLS, CSV, TSV (as applicable)New XLSX file

Tips for better results

  • Use UTF-8 when possible.
  • Keep ZIP codes and account numbers quoted if leading zeros matter.
  • Check the detected delimiter in the preview before downloading.

FAQ

How do I convert a CSV file to Excel without uploading it?

Choose the CSV here; parsing and XLSX generation happen locally in your browser.

Will leading zeros survive CSV to Excel conversion?

The protect-text option writes parsed fields as text, which helps preserve values such as 00123.

Does the converter support semicolon-delimited CSV?

Yes. The CSV parser can detect common delimiters, including commas, semicolons, tabs, and pipes.

Can a CSV contain multiple Excel sheets?

No. One CSV represents one table, so the converter creates one worksheet.

What happens to CSV formulas beginning with an equals sign?

With text protection enabled, fields remain text instead of being intentionally created as executable formulas.

Processing limits

LimitValue
File size25 MB
PreviewUp to 100 rows × 12 columns

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