Lightweight developer utilities: Base64 encode and decode for data URLs and payloads, JSON format and validate for APIs and configs, color conversion across HEX, RGB, HSL, and related spaces, and a QR Code Generator for text, URL, and Wi‑Fi codes with local PNG/SVG download. Handy for debugging, UI tokens, and quick transforms — all client-side with no account required. Prefer redacting secrets before pasting production credentials into any browser tool. Open the utility you need from the list below.