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How to Convert CSV to Excel
Upload CSV file
Conversion happens automatically
Download .xlsx file
Open in Excel, Google Sheets, or LibreOffice
This tool doesn't fix data issues
- Can't restore leading zeros already removed (001 → 1)
- Doesn't repair encoding from non-UTF-8 sources
- Won't fix date formatting—exports dates as-is from CSV
- Can't unmerge cells or recover lost structure
- Doesn't validate data types or clean malformed rows
- Won't split combined columns or restructure data
- Can't extract specific rows or filter data
Common reasons to convert CSV to Excel
- System requires .xlsx format (won't accept CSV uploads)
- Need to add formulas or calculations to imported data
- Want to apply cell formatting (colors, bold, borders)
- Creating charts or pivot tables from CSV data
- Sharing with users who struggle with CSV encoding
- Combining with other Excel sheets via copy/paste
- Need data validation dropdowns or conditional formatting
- Password-protecting sensitive data (Excel feature)
Excel capabilities vs CSV
After conversion: prevent Excel auto-formatting issues
- Leading zeros: Select column → Format Cells → Custom → Type: 00000 (number of zeros = digits needed). Or format as Text before pasting data.
- Dates: If Excel auto-converts text to dates (1-2 → Jan 2), format column as Text first, or prefix with apostrophe in CSV ('1-2).
- Large numbers: Scientific notation (1.23E+11) can be fixed by formatting as Number with 0 decimals and no separator.
- Phone numbers: Format column as Text to preserve + symbol and leading zeros.
- Verification: Check first few rows after opening to catch formatting issues early.
Delimiter and structure requirements
This tool expects standard CSV: comma-separated values, one record per line, optional header row. Cells containing commas must be quoted ("Smith, John"). Line breaks within cells need quoting. If your CSV uses tabs, pipes (|), or semicolons as delimiters, convert to commas first using text editor Find/Replace. Malformed CSVs (inconsistent column counts, unbalanced quotes) may produce unexpected results—validate structure before converting.
When to keep CSV format instead
Don't convert if: importing to databases (PostgreSQL, MySQL prefer CSV), using data in Python/R scripts (pandas/data.table read CSV faster), tracking changes in version control (CSV git diffs are readable, Excel diffs aren't), processing with command-line tools (awk/grep work on plain text), file size matters (CSV is 50-90% smaller), or long-term archival (plain text survives software obsolescence). Excel is for analysis and presentation—CSV is for data storage and transfer.
Key Features
Standard Excel Format
Creates .xlsx (Excel 2007+) files compatible with Microsoft Excel, Google Sheets, LibreOffice Calc, and Numbers.
Single Sheet Output
Generates one worksheet named 'Sheet1'. To combine multiple CSVs into one workbook, convert each separately then copy sheets manually in Excel.
UTF-8 Encoding
Handles UTF-8 encoded CSV files. International characters (accents, symbols) preserve correctly.
Privacy & Security
Client-side processing using SheetJS and PapaParse. Files stay in your browser.
Frequently Asked Questions
Will this prevent Excel from removing leading zeros?
No. If your CSV already has 001, 002 values, they'll still become 1, 2 when you open the Excel file because Excel auto-formats numbers. To preserve zeros: open the .xlsx → format column as Text before entering data, or prefix values with apostrophe in source CSV ('001).
Can I merge multiple CSV files into one Excel workbook?
Not automatically. Convert each CSV separately, then in Excel: right-click sheet tab → Move or Copy → select destination workbook. Or use VBA/Python scripts for batch merging.
What if my CSV uses semicolons instead of commas?
This tool expects standard comma delimiters. For semicolon CSVs (common in Europe), open in text editor → Find/Replace ; with , → save → then convert. Or use Excel's Data → From Text/CSV with custom delimiter.
Will this fix encoding issues?
Only if your CSV is UTF-8. If you see � or mojibake (José → José), your source file uses Windows-1252 or ISO-8859-1. Re-export from source system as UTF-8.
Does conversion add any formulas or formatting?
No. Output is plain Excel file with your CSV data—no formulas, no colors, default fonts. You get a blank slate to add Excel features yourself.
Why not just open CSV directly in Excel?
You can, but Excel's aggressive auto-formatting causes problems: removes leading zeros (ZIP codes), converts dates (1-2 becomes Jan 2), formats large numbers as scientific notation. Converting first gives you more control over how data imports.