CSV/Excel Data Conversion Tool

Overview

A web-based business efficiency tool that allows you to assemble repetitive monthly CSV and Excel processing without programming, save it as a template, and reuse it.

More than just a table viewer, you can create a flow by arranging processing steps in sequence—such as column modification, text formatting, date conversion, duplicate removal, filtering, JOIN, and column mapping—and re-execute the same procedure on files in subsequent months.

Key Features

• No-code processing flow design: Assemble complex transformation steps via GUI, save as a template locally on your device
• Multi-format support: Read and output CSV (UTF-8, Shift-JIS), XLSX, and XLS
• Comprehensive transformation functions: Text, numeric, and date formatting; duplicate removal; filtering; merging multiple files; JOIN by key column
• Quality assurance: Validation feature checks required values, email, phone numbers, numeric values, and dates; displays detailed error reports for problem rows
• Local processing: File contents are processed entirely within the browser without being sent to a server, ensuring data security
• Large data support: Web Worker executes processing of 5,000+ rows on a separate thread, supporting transformation and display of up to 100,000 rows
• Demo mode: Experience a 9-step transformation flow with fictional EC sales data in one click

Supported File Formats

Input: CSV, XLSX, XLS (drag & drop, multiple file selection supported)
Output: CSV UTF-8, CSV Shift-JIS, XLSX

Ideal For

• Those who process CSV and Excel files in the same format every month
• Those with routine tasks involving merging and formatting multiple files
• Those who want to record processing steps and repeat the same operations in subsequent months
• Those who prefer not to use Excel macros or programming
• Those who do not want to upload business data to the cloud