Idiot File Converter Tools is a single-category toolbox built around one job: converting files between common formats, quickly, for free, without asking you to upload anything to a server. Every converter on this site, from CSV to JSON through RAR to ZIP, runs entirely as JavaScript inside your own browser tab.
Rather than trying to be a general-purpose tools site covering unrelated categories like unit converters or password generators, this site focuses on one thing: file format conversion. That focus means every tool gets a proper, dedicated page with a real working converter, a clear explanation of how it works, and answers to the questions people actually ask about it.
Converting a file usually means handing over its contents, and a lot of the files people convert, spreadsheets, documents, configuration files, contain information they'd rather not upload to an unknown server. By doing every conversion locally in the browser using established, open-source JavaScript libraries, your files never leave your device, and the tools stay fast since there's no upload or download round-trip involved.
This site is maintained by a small team who use these exact tools in their own day-to-day work with data files, documents, and configuration formats. If a tool doesn't handle a format correctly, we want to know about it — see the Contact page for how to reach us.