Complete developer toolkit with 35+ professional tools: 16 code formatters with syntax highlighting and line numbers (JSON, JavaScript, TypeScript, Python, PHP, Go, Rust, Swift, Kotlin, C/C++), 9 data converters (JSON to CSV/XML/YAML), 13 utilities (UUID generator, QR generator, password generator, color converter), and 3 text processing tools. All free, secure, and client-side.