Developer Utilities
Beautify code, validate syntax, convert schemas, and generate offline cryptographic keys.
Modern software development and system administration require quick, reliable utilities that do not compromise security. Our suite of free developer tools online is built specifically for software engineers, developers, sysadmins, and security professionals who need high-performance tools in their daily workflow. We offer two essential client-side utilities: the JSON Formatter & Validator (for beautifying, linting, and converting data payloads) and the Password Generator (for generating high-entropy credentials).
For security-sensitive tasks, where tools are run matters. Sending credentials, API responses, or system configurations to a remote backend exposes your data to interception, server logs, or third-party storage. That is why QuillCalc utilities run 100% client-side in your web browser. Using native browser technologies like the Web Crypto API (window.crypto.getRandomValues) for key generation, your data is processed entirely in local memory and is never transmitted over the network.
Whether you are debugging nested API responses, converting JSON configurations to YAML format, or creating cryptographically secure passphrases, our tools provide a fast, private, and frictionless workspace. No accounts, no signups, and no tracking — just pure developer utility whenever you need it.
JSON Formatter & Validator
Format, validate, repair, and convert JSON to YAML. Inspect structural elements in an interactive collapsible tree view with dot-path copying.
Password Generator
Generate highly secure random passwords or EFF passphrase wordlists locally. Customize length, uppercase/lowercase, numbers, and symbols.