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HomeFormatsCSV
.csv

CSV Converter

Convert Comma-Separated Values files online for free — no upload, no registration, 100% private

Feuilles de Calcul format
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What is a CSV file?

Comma-Separated Values (.csv)

CSV (Comma-Separated Values) is the simplest and most universally compatible tabular data format. Each line represents a row, with values separated by commas (or other delimiters like semicolons or tabs). CSV is plain text, making it human-readable, lightweight, and compatible with virtually every application — from Excel and Google Sheets to databases, programming languages, and data analysis tools. CSV does not support formatting, formulas, multiple sheets, or data types — all values are stored as text. It's the standard format for data import/export, ETL pipelines, database exports, API responses, and machine learning datasets. For large datasets, CSV offers simplicity and efficiency, though formats like Parquet or XLSX provide better features for complex data.

Extension: .csvCategory: Feuilles de Calcul

Convert from CSV

Convert your Comma-Separated Values files to other formats

CSVXLSCSVXLSXCSVODSCSVTSVCSVNUMBERSCSVXLSMCSVXLSB

Convert to CSV

Convert other files to Comma-Separated Values format

XLSCSVXLSXCSVODSCSVTSVCSVNUMBERSCSVXLSMCSVXLSBCSV

Frequently Asked Questions about CSV

What is a CSV file?
A CSV file is a spreadsheet format with the extension .csv. Comma-Separated Values files are widely used in digital workflows for creating, sharing, and storing spreadsheet content.
How do I convert CSV files for free?
Use Convert999 to convert CSV files for free directly in your browser. Simply upload your file, select the target format, and click convert. No installation or signup required.
Is it safe to convert CSV files online?
Yes! Convert999 processes all files 100% locally in your browser. Your CSV files are never uploaded to any server, ensuring complete privacy and security.
What formats can I convert CSV to?
Convert999 supports converting CSV to 7+ formats including XLS, XLSX, ODS, TSV, NUMBERS and more. Browse the full list above.

Explore CSV

CSV Converter

CSV → all formats

Convert to CSV

All sources → CSV

Feuilles de Calcul

All spreadsheet formats

File Tools

Compress, resize, merge

Other Feuilles de Calcul Converters

.xlsMicrosoft Excel 97-2003.xlsxMicrosoft Excel.odsOpenDocument Spreadsheet.tsvTab-Separated Values.numbersApple Numbers.xlsmExcel Macro-Enabled.xlsbExcel Binary Workbook