📈 CSV to Excel Converter
Turn CSV text or a .csv file into a proper .xlsx spreadsheet that opens cleanly in Excel — all on your device.
Everything runs in your browser — nothing is uploaded to any server.
How the csv to excel converter works
The tool parses your CSV (from a file or pasted text) into rows and columns with SheetJS and writes a genuine .xlsx workbook, which downloads ready to open in Excel, Google Sheets or LibreOffice. Unlike simply renaming a .csv to .xlsx, this produces a real spreadsheet file with proper cells and types.
Opening a raw CSV in Excel can mangle things — leading zeros stripped from IDs, long numbers shown in scientific notation, dates reformatted. Converting to a true .xlsx gives you a clean spreadsheet to work from. It runs entirely in your browser, so the data in the CSV never leaves your device.
Frequently asked questions
How do I convert CSV to Excel?
Paste your CSV or load a .csv file, and download a real .xlsx workbook. It opens directly in Excel, Google Sheets or LibreOffice.
Why not just rename the .csv to .xlsx?
That doesn't create a real spreadsheet — Excel would still parse it as text and may mangle IDs, big numbers or dates. This writes a genuine .xlsx file with proper cells.
Does it detect the delimiter?
It parses standard comma-separated values, including quoted fields containing commas. For other delimiters, convert to commas first or use the CSV tools.
Is my CSV uploaded?
No — the workbook is built in your browser with SheetJS. The data stays on your device and it works offline.