CapyToolkit is a free collection of more than 45 browser-based utilities for hardware testing, developer work, security, audio, math, text, design, and network tasks. It is built for people who need a fast answer without creating an account or sending sensitive information to a server.

The hardware tools help inspect screens, webcams, microphones, speakers, gamepads, and input lag. Developer utilities format and validate JSON, debug regular expressions, inspect JWT claims, parse cron expressions, convert Base64, generate hashes and UUIDs, count tokens, and query local Parquet, CSV, or JSON files with SQL. Security and privacy tools remove EXIF metadata, scrub personally identifiable information, and perform offline OCR redaction. Audio, math, text, design, and network utilities cover everyday checks such as speaker sweeps, calculations, text transformations, color work, and connection diagnostics.

Every computation runs locally in the browser. Files, audio, camera frames, and pasted content stay on the user's device and are discarded when the tab closes. CapyToolkit does not require an account, does not upload tool inputs, and blocks analytics from tool areas. The site works offline after installation as a progressive web app and is also available as a Windows app through the Microsoft Store. New tools and practical reference guides are added regularly, with examples that explain how to use each utility. CapyToolkit is free to use, English-language, and designed for developers, security-conscious users, students, and anyone who wants a reliable technical check without handing data to a third party.

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