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API Tools tools

Tools for working with APIs and web services. — 3 free, fast tools that run entirely in your browser.

All 3 API Tools tools

GraphQL Formatter

Prettify & minify GraphQL

cURL Converter

cURL → fetch, Python, Go & more

OpenAPI / Swagger Preview

Preview OpenAPI specs

Why use API Tools tools?

100% Private

Every tool runs entirely in your browser. Your data is never uploaded — it stays on your device.

Instant & Free

No sign-ups, no installs, no limits. Open the tool and start using it immediately.

Works Everywhere

Mobile, tablet, desktop — all tools are responsive and work in any modern browser, offline-capable once loaded.