Viewer

Viewer, available at CSVTool.io, is a browser-based suite of free online tools for handling CSV files. It addresses the need to view, edit, clean, and convert CSV and related tabular data formats without requiring software installation or file uploads. The platform is designed for users who work with CSV files and need quick, private, and accessible tools for managing tabular data directly in their browser.

Among its capabilities, Viewer provides a spreadsheet-style CSV viewer that allows users to open CSV files and interact with them using features like sorting, filtering, and search. The CSV editor enables cell-level editing, as well as adding or removing rows and columns, supporting efficient data cleaning and modification. The suite also includes tools for validating and repairing malformed CSV files, reviewing suggested repairs, and preparing corrected copies for import elsewhere.

Conversion features are a key part of the offering, with tools to convert CSV files to Excel formats (.xlsx, .xls), JSON, SQL, XML, TSV, and more. It also supports converting between CSV and Excel files, as well as handling TSV and TXT file types. Additional utilities allow users to join, split, compare, merge, filter, sort, deduplicate, and transpose CSV files, as well as convert between CSV and geographic data formats like KML and GeoJSON.

All processing is performed locally in the browser, ensuring that files are never uploaded to external servers. The service enforces a 10 MiB maximum file size for input, rejecting larger files before any local processing begins. No signup is required, and all tools are offered free of charge. Viewer is suitable for anyone needing to manipulate, convert, or inspect CSV and related data formats in a private, web-based environment.