Convert CSV to XLSX Online
Free, fast, and secure. Convert CSV files to XLSX directly in your browser — no uploads, no limits.
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About CSV to XLSX Conversion
Adapt your documents for any workflow or platform. From legacy format support to modern document standards, we ensure your content transfers perfectly between formats.
How to Convert CSV to XLSX
Converting files has never been easier or more secure. MixConvert uses advanced browser-based technology to process your files instantly without uploading them to a remote server. Follow these simple steps to get started:
- Select Your Files: Click "Choose Files" or simply drag and drop your CSV files (.csv) into the upload area.
- Choose Output Format: Verify that XLSX (.xlsx) is selected as your target output format.
- Convert Instantly: Hit "Convert All" and watch as your files transform instantly using our browser-based engine.
- Download: Download your converted XLSX files individually, or grab them all at once as a ZIP archive.
CSV to XLSX FAQ
How do I convert CSV to XLSX on my phone?
MixConvert works seamlessly on iOS and Android devices. Open this page in your mobile browser, select your CSV files, and convert to XLSX with the same ease as on desktop.
Is it safe to convert CSV to XLSX here?
Yes, your files never leave your device. We use WebAssembly technology to process CSV files locally in your browser, making this the most private way to convert to XLSX.
Is there a file size limit for CSV to XLSX conversion?
There are no arbitrary size limits. Since conversion happens locally, your device's RAM and processing power are the only constraints. Most modern devices handle files of any practical size.
How long does CSV to XLSX conversion take?
Most CSV files convert to XLSX in just a few seconds. Processing time depends on file size and your device's CPU. Large video files may take a bit longer.
Can I batch convert multiple CSV files?
Yes! Select multiple CSV files and convert them all to XLSX simultaneously. You can then download each file or grab everything as a single ZIP archive.
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Understanding the Formats
CSV
Comma-Separated Values
Simple data format where values are separated by commas. Universal for data exchange.
XLSX
Microsoft Excel Workbook
Excel's modern spreadsheet format supporting formulas, charts, and multiple sheets.
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