GeekFormat is your free, no-signup toolkit, with fast, reliable JSON formatting as its core feature. Clean, validate, and pretty-print messy JSON in one click, right in your browser.
Beyond JSON, it includes 200+ tools for developers and webmasters: PDF processing, image compression, CSV conversion, Base64/URL/MD5 encoding, WHOIS lookup, QR code generation, and more.
All tools are 100% free, no watermarks, and require no registration.