Convert Excel to CSV Without Losing Data
You need to upload a CSV file, but you have an Excel spreadsheet. Converting sounds simple, but special characters, dates, and formulas can get mangled. Here is how to do it right.
Quick Answer
Use the free XLSX to CSV converter at dotsapps.com. It runs entirely in your browser — your file never leaves your computer. It preserves special characters and handles large files.
Why Excel to CSV Conversion Loses Data
CSV files are plain text. They cannot store formulas, formatting, colors, or multiple sheets. When you convert, all of that gets stripped away. Only the raw values remain.
Common problems during conversion:
- Dates turn into numbers (like 45000 instead of 2023-03-15)
- Leading zeros disappear (ZIP code 01234 becomes 1234)
- Special characters get garbled (accented letters, currency symbols)
- Commas in data break the column structure
A good converter handles these issues. A bad one does not.
How to Convert XLSX to CSV Properly
The safest way is to use a dedicated converter that reads the actual XLSX file format. This avoids the problems that come from copy-pasting or using Save As in Excel.
The converter at dotsapps.com reads your XLSX file directly in the browser. It correctly handles:
- UTF-8 encoding for special characters
- Proper quoting of fields that contain commas
- Date values in standard format
- Multiple sheets (converts each to a separate CSV)
Your file stays on your computer the entire time. Nothing gets uploaded to any server.
Keeping Leading Zeros and Special Formats
ZIP codes, phone numbers, and product codes often start with zero. CSV files treat these as numbers and drop the zeros.
The fix is to make sure the converter outputs these fields as text. When you import the CSV into another program, tell it to treat those columns as text, not numbers.
In Google Sheets, use File → Import and set the column type to Text. In Excel, use the Text Import Wizard and mark the columns as Text.
Converting CSV Back to Excel
Going from CSV to XLSX is often needed too. Maybe you got a data export and want to analyze it in Excel.
The same tool converts in both directions. Upload your CSV and download an XLSX file. The converter auto-detects column types and formats them correctly.
This saves you from the common problem of Excel misinterpreting dates, numbers, and text when you open a CSV file directly.
How to Do It: Step-by-Step
- 1
Go to the XLSX/CSV Converter at dotsapps.com
- 2
Drop your Excel file into the upload area or click to browse
- 3
Preview the data to make sure it looks correct
- 4
Click Convert to download your CSV file
- 5
Open the CSV in your target application
Frequently Asked Questions
Does converting Excel to CSV lose formatting?
Yes. CSV is plain text and cannot store colors, fonts, borders, or formulas. Only the raw cell values are kept. This is normal and expected.
Is my file uploaded to a server?
No. The converter runs entirely in your browser. Your file never leaves your computer. This keeps your data private and works offline too.
Can I convert a CSV with multiple sheets?
CSV files only have one sheet. If your Excel file has multiple sheets, the converter creates one CSV file per sheet.
Why do my dates look wrong after conversion?
Excel stores dates as numbers internally. A good converter translates these to standard date format (YYYY-MM-DD). If yours shows numbers like 45000, use a converter that handles date formatting.
What is the maximum file size I can convert?
Since the conversion happens in your browser, it depends on your computer's memory. Most machines handle files up to 50-100MB without issues.
Ready to Try It?
XLSX / CSV Converter is free, private, and works right in your browser. No sign-up needed.
Open XLSX / CSV Converter