CSV to XLSX Converter

Convert your CSV files to XLSX in seconds — free and online.
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Select or drag & drop files to begin.

How to convert CSV to XLSX?

Just three simple steps — no downloads, no hassle.
Click the “Choose files” button and upload your CSV file.

You can drag and drop it too — we’re flexible!

Choose “XLSX” as the output format, then click “Convert”.

We’ll take care of the rest — it only takes a few seconds.

All done! Your file is now in XLSX format.

Just download it and enjoy. Easy, right?

At a glance: CSV to XLSX

🔁 Conversion: CSV to XLSX ⏱ Average conversion time: 20 seconds 💳 Cost: Free 📂 Category: Spreadsheets ✳️ Extensions: .csv → .xlsx 📏 Max file size: 75 MB 👩‍💻 Works on: Windows, Linux, macOS, iOS, Android

About CSV

CSV is a simple text format used to store tabular data, such as spreadsheets or databases. Each line represents a row, and values are separated by commas. CSV files are supported by nearly all spreadsheet and data-processing programs, making them a universal choice for data exchange.

About XLSX

XLSX is the modern Excel spreadsheet format introduced with Microsoft Office 2007. It uses ZIP compression and an XML-based structure, resulting in smaller files and better compatibility. XLSX supports advanced spreadsheet features and is widely used in business and data analysis.

Why Convert CSV to XLSX with MiConv?

Because it's quick, easy, and made for people like you.

No software needed

Convert your .csv files to .xlsx right in your browser — no downloads, no installs. Everything happens securely in the cloud.

Your files stay private

We never store your files permanently. Only you can access them, and they’re automatically deleted from our servers within 2 hours.

Fast, free, and effortless

Turn your CSV files into XLSX in just a couple of clicks. No registration, no limits — and it’s 100% free.

More CSV conversions you can try

Explore other formats you can turn your CSV files into — it's easy!

CSV to XLSX Converter Quality Rating

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