EasyFormatConverter is a collection of free online tools to convert data formats — JSON, YAML, CSV, XML, TOML — and to generate typed code (TypeScript, Python, Go, Rust) from JSON samples. Around 100 converters, each available in seven languages.
Privacy by design
Every conversion runs entirely in your browser. There is no upload endpoint, no processing server: the code that does the work is downloaded with the page and executes locally. You can load a tool, disconnect from the internet, and it keeps working. That makes these tools safe for API keys, customer data and anything else you would not paste into a random website.
How to check that for yourself
Nothing here asks you to take our word for it.
Open your browser’s developer tools, switch to the Network tab, and convert something: no request leaves the page. Or load a tool, turn off your connection, and keep converting — the page already has everything it needs. The site is a set of static files, and each converter is plain JavaScript that arrives with the page and runs in your tab, like any other script on it.
What we measure, and what we don’t
Aggregate traffic only — page views, referrers, countries — through a self-hosted Umami instance. No cookies, no fingerprinting, no cross-site tracking, which is why you see no cookie banner: there is nothing to consent to.
What you paste into a tool is never part of that, for the simple reason that it never leaves the tab. The privacy policy names every service involved, by name.
Free, fast and to the point
No account, no paywall, no cookie banner. Each tool does one conversion well, with real-time output, syntax highlighting and proper handling of the edge cases that break naive converters — quoted CSV fields, YAML anchors, XML attributes, TOML tables.
What these tools don’t do
Worth saying plainly, because it is the kind of thing you would rather learn here than halfway through a task:
- Everything runs in memory, so the practical size limit is your browser’s, not a server’s. Very large inputs get slow before they get wrong.
- Some formats have genuinely ambiguous corners — whether an XML value should become an attribute or an element, how a YAML anchor should be flattened. Each converter picks one reasonable answer and applies it consistently, but it is a choice, not a law.
- Generated code — TypeScript types, Go structs, SQL schemas — is inferred from the one sample you paste. It describes that sample. A field missing from your example is missing from the output, and a field that happens to be null in your example cannot tell the generator what type it usually holds.
Built by developers
These are the tools we wanted ourselves: open one, paste, copy the result, get back to work. No onboarding, no tour, no newsletter — just the conversion you came for.