How to Convert CSV to Excel (XLSX)
Convert CSV, TSV, and delimited text files to Excel (XLSX) directly in your browser. Your files are processed locally on your device without uploading your data to a server. You can also merge multiple CSV files or convert Excel files back to CSV with our Excel to CSV Converter.
What Is a CSV File?
CSV (Comma-Separated Values) is a plain-text format for storing tabular data. Values are commonly separated by commas, but semicolons, tabs, and pipes are also used.
Example CSV Data
Why Convert CSV to XLSX?
CSV is useful for storing and exchanging raw data, but it does not support features such as formulas, formatting, charts, or multiple worksheets. Converting CSV to XLSX makes your data easier to edit, analyze, organize, and share.
How to Convert CSV to Excel Online
- Upload Your CSV File: Drag and drop your CSV, TSV, or delimited text file into the upload area.
- Check the Preview: The converter detects the delimiter automatically and shows a live preview. You can change the delimiter manually when needed.
- Download Your Excel File: Click the Download Excel button to save your converted XLSX file.
CSV vs Excel: Key Differences
CSV and Excel are designed for different purposes. Here are the main differences:
| Feature / Aspect | Comparison Summary |
|---|---|
| Formatting | CSV stores plain data; Excel supports formatting and styling. |
| Multiple Sheets | CSV contains one table; XLSX supports multiple worksheets. |
| Formulas | CSV cannot store Excel formulas; XLSX can. |
| Data Types | XLSX supports structured numbers, dates, percentages, and other cell types. |
Common CSV Conversion Problems
Leading zeros
Values such as 007 or 00123 can lose their leading zeros when opened in spreadsheet software. The converter helps preserve these values where supported.
Wrong delimiter
CSV files may use commas, semicolons, tabs, or pipes. The converter automatically detects common delimiters and lets you select one manually.
Date interpretation
Some spreadsheet applications may interpret values such as 1-2 or 03/04 as dates. Checking the preview helps identify unexpected conversions.
Special characters
UTF-8 encoded CSV files can contain accented and non-Latin characters. The converter preserves supported characters during conversion.
Technical Specifications & Privacy Guarantee
100% client-side security standards and browser-native processing
Input Formats
.csv, .tsv, .txt
Comma, semicolon, tab, pipe delimiters
Output Format
.xlsx (Excel 2007–2024)
Office Open XML Spreadsheet format
Architecture
100% Client-Side
Zero bytes sent to external servers
Data Privacy
Zero Data Retention
GDPR & HIPAA compliant by design
Character Encoding
UTF-8, Latin-1, Windows-1252
Preserves accents, non-Latin scripts, emoji
Usage & Limits
100% Free Forever
No login, no daily conversion caps