📈 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. Parsing is quote-aware per RFC 4180, so a quoted field containing a comma stays in one cell and a doubled quote ("") collapses to a single literal quote. Each parsed row becomes a spreadsheet row and each field its own cell, written into a single worksheet inside the workbook.
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.
Will a code like 007 keep its leading zeros?
This is the main reason to convert rather than double-click a CSV: Excel auto-parses a raw CSV and can strip leading zeros or show long numbers in scientific notation. A generated .xlsx has each cell already written, so codes and long IDs are preserved as they appeared in the CSV text.
How many sheets does the output have?
One, a CSV is a single table, so it maps to a single worksheet. To combine several CSVs into one multi-sheet workbook, convert each separately and copy the sheets together in Excel.
Is my CSV uploaded?
No, the workbook is built in your browser with SheetJS. The data stays on your device and it works offline.