Convert CSV to XLSX
What is CSV?
Comma-Separated Values
CSV is a plain text format for storing tabular data where each line represents a row and values are separated by commas (or other delimiters). It's the simplest and most universal format for data exchange, containing no formatting, formulas, or multiple sheets - just raw data.
- Plain text format
- Universal compatibility
- No formatting or formulas
- Small file size
- Easy to parse programmatically
What is XLSX?
Microsoft Excel Spreadsheet
XLSX is the XML-based spreadsheet format used by Microsoft Excel since 2007. It uses ZIP compression to store worksheets, formulas, formatting, and charts in XML format. Supports advanced features like pivot tables, macros, and complex calculations with millions of rows and columns.
- XML-based structure with ZIP compression
- Supports formulas and calculations
- Multiple worksheets per file
- Charts, graphs, and pivot tables
- Conditional formatting and data validation
Why Convert CSV to XLSX?
✓ Add Formatting
Apply colors, fonts, borders, and styling to make data more readable
✓ Use Formulas
Add calculations, functions, and data analysis features
✓ Create Charts
Visualize data with graphs, pivot tables, and conditional formatting
✓ Multiple Sheets
Organize related data across multiple worksheets in one file
How to Convert CSV to XLSX
- Click the "Start Converting Now" button above
- Upload your CSV file or drag & drop it
- Select XLSX as the output format (pre-selected for you)
- Click "Convert" and download your XLSX file
Features
- ✓ 100% Free Conversion
- ✓ No Registration Required
- ✓ Fast Processing
- ✓ Cross-Platform Compatible
- ✓ Secure Server Processing
- ✓ Auto-Delete After 5 Minutes
- ✓ Batch Processing Available
- ✓ Mobile Friendly
Frequently Asked Questions
How much smaller will my XLSX file be?
Typically 70-90% smaller than CSV. The exact reduction depends on content and quality settings. For example, a 50MB CSV file might become 5-10MB as XLSX. Higher quality settings create larger files but better preserve the original.
Can I convert multiple CSV files at once?
Yes! Free users can convert up to 3 files per batch (5 conversions/day total). Premium users get batch conversion of up to 20 files with automatic ZIP download. Simply select multiple files when uploading.
Is my data safe during conversion?
Yes! Files are processed on GDPR-compliant European servers with automatic deletion after 5 minutes. We don't store, analyze, or share your files. The conversion is secure and private.
What are the conversion limits?
Free: 5 conversions per day, max 100MB per file, up to 3 files per batch. Premium: Unlimited conversions, max 500MB per file, up to 20 files per batch with ZIP download.
How long does conversion take?
Most conversions complete in seconds. Small files (under 10MB) typically convert in 1-5 seconds. Larger files or complex formats may take 10-30 seconds. Browser-based conversions are usually faster than server-processed ones.
Do I need to install any software?
No! Everything works directly in your web browser. No downloads, no installations, no plugins required. Just upload your file and convert. Works on Windows, Mac, Linux, and mobile devices.
Ready to Convert?
Start converting your CSV files to XLSX now - it's fast, free, and secure!
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