CSV to Excel Converter

CSV dialects this page accepts

Paste or open a .csv (and related text delimiters the UI allows). The parser splits rows and cells, then builds a spreadsheet file in the browser for download as .xlsx. No file is uploaded to ToolPetal.

Quoted fields with commas inside them are handled with standard CSV quoting rules. Encoding is treated as UTF-8 text from the textarea or file reader.

Worked example: a two-column CSV to one sheet

CSV:

name,role
Ada,Engineer
Lin,Designer

Download yields a workbook with one sheet and those three rows (header plus two people). Open it in Excel, Sheets, or LibreOffice to confirm column splits.

Limits

Macros, multiple sheets, and Excel-specific formatting are out of scope. Extremely large CSVs may hit memory limits. If Excel still misreads separators, check regional delimiter settings (comma vs semicolon) and UTF-8 import options.

Worked delimiter pitfalls

European Excel builds often expect semicolons. If columns land in one cell, switch the delimiter in the source CSV or use Excel Text Import with the correct separator. This converter assumes comma-separated values unless the UI offers another delimiter.

After download, spot-check that leading zeros in ZIP codes or phone numbers survived. Excel may coerce numeric-looking text unless you import columns as text in the desktop wizard.

Worked example: leading zeros and quoted commas

A CSV row 00123,"Smith, Ann",2026-10-14 has three columns: the quotes keep the comma inside the name. Opened directly in Excel, 00123 often becomes 123. Converting to .xlsx lets you check columns before sharing, and the file opens the same way for everyone instead of depending on each person's import settings.

Pitfalls

• Semicolon delimiters. CSV exports from locales that use a decimal comma often separate fields with semicolons. If everything lands in one column, the delimiter is wrong.
• Row limits. An Excel worksheet holds at most 1,048,576 rows and 16,384 columns.
• Dates. 03/04/2026 is ambiguous between regions. ISO dates (2026-03-04) avoid the problem.

FAQ