Want to convert Excel file to CSV file?
Try Withdata Data File Converter, a desktop Excel to CSV converter for Windows, MacOS, and Linux, Convert Excel to CSV, Easy and Fast.
- Can run in GUI mode, Step by Step, just a few mouse clicks.
- Can run in Command line, for Scheduled Tasks and Streams.
- Convert files locally and privately, avoid uploading large Excel file(s) to online services.
- Support Windows, Linux, and macOS.
Download Withdata DataFileConverter 
Convert Excel to CSV
Choose Excel file -> Set CSV file -> Convert Excel to CSV
“Start a New Convert” for “Excel to CSV”.
Select From “File” “Excel” To “File” “CSV”.
1. Open source Excel file.
Support large Excel file ( > 4GB ).
Source Excel file’s content is like this:
2. Config target CSV file.
3. Set rows options.
4. Convert Excel to CSV.
After converting, you can view the output CSV file.
More about Excel to CSV converter
Download Withdata DataFileConverter
See also:
- Merge multiple Excel files into one CSV
- Batch convert Excel files to CSV files
- Convert Excel to CSV Online for Free
EXCEL → CSV reference
Type mapping
| Value kind | in EXCEL | in CSV |
|---|---|---|
| Int | 1234 (a real numeric cell) | 1234 |
| Bigint | 9007199254740993 (exact only while the cell stays text) | 9007199254740993 |
| Decimal | 1234.56 (numeric cell, format controls the displayed decimals) | 1234.56 |
| Float | 1.234E+10 (numeric cell) | 1.234e+10 |
| Text | text cell; leading zeros survive only if the column is text | quoted only when it contains a comma or a quote |
| Long text | text cell; wraps inside the cell rather than the row | must be quoted; line breaks inside force multi-line records |
| Date | a serial number plus a date cell format | 2026-09-18 |
| Datetime | a serial number plus a date-time cell format | 2026-09-18 14:30:00 |
| Binary | not representable as data | not representable - base64 or hex string |
| Boolean | TRUE / FALSE (a real boolean cell) | TRUE / FALSE, or 1 / 0 depending on the writer |
| JSON | a text cell; the quotes are part of the value | the whole JSON value quoted, with internal quotes doubled |
Dialect differences
Both EXCEL and CSV are file formats, so what differs below is how each one chooses to represent a value.
| Property | in EXCEL | in CSV |
|---|---|---|
| identifiers | Not applicable; a cell holds exactly one value | Double quotes; a literal quote is doubled ("" ) |
| dates | Stored as a serial number; only the cell format makes it lo... | Conventional text: 2026-09-18 or 2026-09-18 14:30:00 |
| binary | Only as text or an embedded object, not as a data column | Not supported |
| separator | Cells, not delimiters | Comma "," |
| encoding | UTF-8 internally, declared in the package | No declaration - UTF-8 works only with a BOM |
| typing | Real cell types: text, number, date, boolean, error | None - every field is text |
| shape | Multiple sheets, each a flat grid | Flat table, optional header row |
| ceiling | 1,048,576 rows x 16,384 columns per sheet; 255 sheets per w... | No formal limit; row count bounded by memory |
Do it online, free
Skip the manual work — convert Excel to CSV online, free (runs in your browser, nothing is uploaded). For large files or batch jobs, use the desktop apps.
