Free Online CSV Tools

Process large files in your browser with DuckDB-WASM.

Convert from CSV

CSV to JSON

Convert CSV files to JSON format instantly in your browser.

CSV to Parquet

Convert CSV files to Apache Parquet format instantly in your browser.

CSV to TSV

Convert CSV files to TSV (tab-separated) format instantly in your browser.

CSV to Excel

Convert CSV files to Excel (XLSX) format instantly in your browser.

Convert to CSV

Excel to CSV

Convert Excel XLSX files to CSV format instantly in your browser.

JSON to CSV

Convert JSON files to CSV format instantly in your browser.

Parquet to CSV

Convert Apache Parquet files to CSV format instantly in your browser.

TSV to CSV

Convert TSV (tab-separated) files to CSV format instantly in your browser.

Merge CSV

Merge multiple CSV files into one using UNION.

CSV Merge Tool

Combine multiple CSV files into one. Handles different column structures with automatic alignment.