Convert XLSX to CSV Online — Free Spreadsheet Converter
Transform Excel XLSX files to comma-separated CSV format.
Upload your file
Drag & drop your .xlsx file here, or browse
Multiple files supported
Maximum file size: 500 MB · Multiple files supported
100% private — files are processed in your browser, never uploaded
XLSX to CSV in 4 Easy Steps
Convert XLSX to CSV in seconds — no sign-up, no upload, no catch.
- 1
Upload XLSX file
Drop your .xlsx or .xls file or click Browse.
- 2
CSV auto-selected
CSV is pre-selected as the output format.
- 3
Convert locally
Your spreadsheet is parsed and exported as CSV in your browser.
- 4
Download CSV
Save your CSV file.
Why convert XLSX to CSV?
- Import Excel data into databases
- Share spreadsheet data in a universal format
- Prepare data for scripting languages
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Why Convert XLSX to CSV with Mr. Converter?
Discover why millions of users trust Mr. Converter for fast, secure, and accurate XLSX to CSV file conversions directly inside their browser.
100% Private & Secure
- ✓Zero File Uploads: Conversions execute locally on your machine using browser WebAssembly.
- ✓No Cloud Storage: Your confidential data never touches remote servers or third-party databases.
- ✓GDPR & Privacy Compliant: Complete end-to-end privacy for sensitive documents and media.
Lightning Fast & Unlimited
- ✓Instant Processing: Skip queue wait times and server upload delays.
- ✓No File Size Limits: Convert large XLSX files without artificial size restrictions or paywalls.
- ✓No Email Required: Instant direct downloads without registration or credit cards.
Format Comparison: XLSX vs CSV
| Feature / Property | XLSX Format | CSV Format |
|---|---|---|
| Primary Category | Source Document / Media | Target Converted File |
| Browser Compatibility | Standard Compatible | 100% Universal Support |
| File Compression | Uncompressed / Original Struct | Optimized & Portable |
| Privacy & Encryption | Preserved during conversion | Encrypted output supported |
| Typical Use Case | Editing & Content Creation | Sharing, Archiving & Publishing |
Frequently Asked Questions
The first sheet is converted by default. Multiple sheets can be exported separately.
CSV only contains values, not formulas. Use XLSX for formula preservation.