Convert CSV to XLSX
Last updated: June 1, 2026To convert CSV to XLSX, drop your CSV file into the converter above, then download the XLSX result. It's free, needs no sign-up, and there's no watermark. Your file is processed on our secure server over an encrypted connection and deleted automatically right after — never stored or shared.
Why convert CSV to XLSX?
CSV is plain comma-separated text with no formatting, formulas, or cell types, which is why opening one directly in Excel often mangles leading zeros, long ID numbers, and dates. Converting to XLSX gives you a true Excel workbook: a real spreadsheet you can format, add formulas and pivot tables to, freeze panes in, and split across multiple sheets. Upload your .csv here and download a clean, ready-to-edit .xlsx in seconds — free, no sign-up, no watermark.
- A database, CRM, or analytics export came out as CSV and you need it as a proper .xlsx workbook so colleagues can open it in Excel without running the text-import wizard.
- You want to build formulas, charts, conditional formatting, or a PivotTable on the data — none of which a flat CSV can store — and need it in native Excel format first.
- Your CSV holds postal codes, phone numbers, or SKUs with leading zeros that Excel keeps stripping, and you want them preserved in a saved workbook you can share.
CSV vs XLSX
CSV · Comma-Separated Values
CSV is plain-text tabular data — one row per line, values separated by commas. Universally importable into any spreadsheet or database, but it stores only values, not formatting or formulas.
XLSX · Microsoft Excel
XLSX is the modern Excel spreadsheet format with formulas, multiple sheets and charts, editable in Excel, Google Sheets and LibreOffice Calc.
CSV to XLSX — frequently asked questions
Will my columns and rows stay intact during the conversion?
Yes. The server reads your CSV's delimiter and maps each field into its own spreadsheet cell, so the row-and-column layout matches the original. Cells arrive unformatted (default font, no colors) because a CSV carries no styling — but every value lands in the right place, ready for you to format in Excel.
Do my CSV values keep their formulas in the XLSX file?
A CSV never contains formulas in the first place — it only stores final computed values as plain text. The converted XLSX holds those same values, and because the file is now a fully editable Excel workbook you can add live formulas, references, and functions on top of them.
Is the conversion private, and does it cost anything?
It is completely free with no account, no email, and no watermark. Your file is sent over an encrypted HTTPS connection to our conversion server, converted there, and deleted immediately afterward. It is not processed inside your browser, so a fast, reliable upload matters.
How do I convert CSV to XLSX?
Drop your CSV file (or several) into the converter, confirm XLSX is selected as the output, click convert, then download the XLSX file. The whole thing takes a few seconds.
Is this CSV to XLSX converter free?
Yes — it's completely free with no watermark and no sign-up required.
Is it safe to convert CSV to XLSX here?
Yes. Your CSV file is sent over an encrypted HTTPS connection to our conversion server, converted, and deleted automatically moments later — it is never stored, logged or shared.
Can I convert multiple CSV files at once?
Convert one CSV file at a time — finish one, then drop in the next.
Does it work on mobile?
Yes — the converter runs in any modern browser on phones, tablets and desktops.