Data · Best format for…
Best Spreadsheet Format for Data Exchange
Spreadsheets fail at boundaries — encoding, delimiters, and formulas that are not values. Pick CSV for machines and XLSX for people.
Quick take: CSV for values and pipelines. XLSX when humans need sheets, formulas, and formatting. TSV when commas fight your data.
Formats to consider
CSV
Best machine interchangeUbiquitous imports/exports.
Pros
- Universal
- Simple
Cons
- No formulas/formatting
XLSX
Best human workbookExcel/Sheets business default.
Pros
- Formulas
- Multiple sheets
Cons
- Heavier for ETL
TSV
Best when fields contain commasTab-separated values.
Pros
- Fewer comma collisions
Cons
- Less common than CSV
JSON
Best for nested API dataNot a sheet — convert when flat.
Pros
- Structured
Cons
- Needs flattening for CSV
ODS
Open workbook alternativeLibreOffice-first.
Pros
- Open standard
Cons
- XLSX more common in business
Recommendations by situation
Database or Python import
Pick: CSV (UTF-8)
Clean values, easy parsers.
Finance model for a teammate
Pick: XLSX
Formulas and formatting.
API dump to analysts
Pick: JSON → CSV
Flatten then sheet.
Legacy .xls file
Pick: Move to XLSX or CSV
Modernize.
Convert now
Turn the recommendation into a file — every converter between these formats is linked below. Processing stays in your browser.
All related converters (60)
Related comparisons
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FAQ
Why did Excel mojibake my CSV?
Encoding mismatch — prefer UTF-8 and use the import wizard when needed.
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