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CSV to XLSX Converter

Convert CSV (.csv) to Excel (XLSX) (.xlsx) via a free public conversion API from the browser. UniConvert is come-convert-leave: no account and no permanent file library.

Open the interactive CSV to XLSX Converter (loads automatically when JavaScript is available).

How to convert CSV to XLSX

Step 1. Choose a .csv file from your device.
Step 2. Confirm the output format is .xlsx — this page is already set to CSV → XLSX.
Step 3. Start the conversion, then preview, copy, or download the .xlsx result. Nothing is kept for later.

Why convert CSV to XLSX here

CSV → XLSX uses a free public API called directly from the page — no UniConvert servers in the middle.
Category: Office — Word, Excel, and PowerPoint conversions with fidelity noted when partial.
No signup, no subscription, and no permanent storage of your files on UniConvert.
Status: available now.

CSV to XLSX FAQ

Is this CSV to XLSX converter free?

Yes. UniConvert does not require an account for CSV → XLSX. Ads may appear to keep the site free.

Do you store my CSV files?

Files for this pair are sent to the free conversion provider for processing and are not stored by UniConvert afterward.

What is the difference between .csv and .xlsx?

.csv is treated as the input format and .xlsx as the output. Use this page when you specifically need CSV → Excel (XLSX) rather than a generic upload form.

Can I convert other formats in Office?

Yes — open the Office category for other pairs, or use Convert a file to pick any available source and target.

Is office layout preserved for CSV → XLSX?

Layout fidelity depends on the conversion path. Complex documents may look different from Microsoft Office or LibreOffice.