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API Tools

Fast, privacy-first utilities that run completely inside your browser. No data ever leaves your device.

5 tools

cURL Command Builder

Build cURL commands from a simple form.

HTTP Header Analyzer

Inspect and explain HTTP response headers.

CIDR / Subnet Calculator

Calculate subnet ranges from CIDR notation.

User-Agent Parser

Parse a User-Agent string into browser, OS, and device info.

GraphQL Query Formatter

Format and beautify GraphQL queries.

Frequently Asked Questions