無料オンラインCSVツール

DuckDB-WASMでブラウザ上で大容量ファイルを処理できます。

CSVから変換

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.

CSVに変換

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結合ツール

複数のCSVファイルを1つに結合。異なるカラム構成でも自動的に整列します。