Supported File Formats

File formats supported for data import in Twenty.

Supported Formats

Twenty supports three file formats for import:

Format	Extension	Notes
CSV	.csv	Recommended, most compatible
Excel	.xlsx	Modern Excel format
Excel (Legacy)	.xls	Older Excel format

File Requirements

Requirement	Value
Encoding	UTF-8 recommended
Record limit	10,000 records per file
Structure	First row must contain column headers
Content	One object type per file

CSV Best Practices

• Delimiter: Use comma (,) or semicolon (;)
• Text qualifier: Use double quotes (") for text containing commas
• Line endings: Windows (CRLF) or Unix (LF) both supported
• Empty values: Leave cells empty, don’t use “NULL” or “N/A”

Excel Best Practices

When exporting from Excel:

• Remove formulas (export values only)
• Delete empty rows at the end
• Ensure no merged cells
• Use the first sheet only

Large Datasets

For datasets larger than 10,000 records:

• Split into multiple files
• Or use the API import for unlimited records

For very large migrations (100,000+ records), the API is significantly faster and more reliable than CSV imports.