All 146+ Free Online Tools — Complete Directory

DuskTools is a developer-focused utility site where every tool runs entirely in the browser. No data you enter is sent to a server — your JSON payloads, passwords, tokens, and files stay on your machine. The collection spans nine major categories. JSON & data tools cover formatting, validation, path finding, flattening, key extraction, and conversions between JSON, CSV, YAML, XML, and TypeScript. Text tools handle word counting, case conversion, diff checking, Markdown editing, slug generation, and placeholder text.

Encoding & security tools include Base64, URL encoding, MD5/SHA hash generation, password generation, JWT decoding, and TLS certificate inspection. CSS & design tools cover gradient generators, box shadow builders, color conversion (HEX/RGB/HSL), color contrast checking, and responsive layout helpers. HTTP & API tools include an API request builder, cURL generator, cookie parser, CORS checker, redirect checker, and a complete HTTP status code reference for all 60+ codes. Developer tools cover regex testing, cron parsing, UUID generation, SQL formatting, GraphQL formatting, and Git/Docker references.

Calculators span age calculation, aspect ratio, percentage, loan repayment, subnet masks, and investment growth. Image tools include format conversion, EXIF removal, image blurring, favicon generation, and SVG viewing. Finally, network & system tools cover DNS lookup, IP geolocation, port scanning, user agent parsing, and Unix permissions. Use the alphabetical index below or the letter shortcuts to jump directly to any tool.