CSV to Excel
Paste CSV with a header row. Download it as a real .xlsx spreadsheet.
Want the full picture? Read: CSV to Excel: Turning Plain Text into a Real Spreadsheet
Related reading: Read: CSV to Excel: Keeping Leading Zeros and Long IDs From Getting Mangled
How it works
This tool parses your CSV using the same logic as the CSV to JSON converter, then builds a real .xlsx workbook using the SheetJS library — entirely in your browser, so the file never leaves your device.
When you’d use this
- Turning a plain-text CSV export into a proper spreadsheet file to hand off to a non-technical teammate
- Getting a database or API export into Excel with correct column structure, ready for filtering and formulas
- Converting a CSV before uploading it somewhere that specifically requires an .xlsx file
Common questions
Is the downloaded file a real .xlsx, or just a renamed CSV?+
A genuine .xlsx workbook, built using the SheetJS library. It opens correctly in Excel, Google Sheets, and Numbers with proper column structure — not a text file with a changed extension.
Does this preserve number formatting or formulas?+
No — since the input is plain-text CSV, there's no formatting or formula information to preserve. Values are written as plain data; any formatting you want would need to be applied after opening the file.
Can I convert a CSV with thousands of rows?+
Yes — there's no artificial row limit since everything runs in your browser rather than through a server upload. Very large files may take a moment longer to process, but there's no hard cap like many free online converters impose.
What if my CSV uses semicolons instead of commas?+
This tool currently expects comma-delimited CSV. If your file uses semicolons (common in European locales), convert it via the CSV to JSON tool first with the semicolon delimiter option, then use JSON to CSV to get comma-delimited output before converting to Excel.