Developer Tools calculators and tools.
Formatters, encoders, regex testers, and color converters built for developers. Built to run completely client-side in your browser for total privacy and speed.
JSON Formatter & Validator
Beautify, minify, and validate JSON with syntax highlighting and optional schema validation.
Regex Tester
Test and debug regular expressions with live match highlighting, capture group extraction, and plain-English pattern explanation.
UUID/GUID Generator
Generate v1, v4, and v7 UUIDs in bulk with options for casing, dashes, and copy-to-clipboard.
Base64 Encoder/Decoder
Encode and decode Base64 strings, images, and files with drag-and-drop support and data URI preview.
Diff Checker
Compare text and code side-by-side or inline with line-level and word-level diff highlighting.
Color Picker & Converter
Pick, convert, and analyze colors with HEX/RGB/HSL support, WCAG contrast checker, palette generator, and CSS gradient builder.
Explore Other Categories
Finance & Loans
Calculate mortgage payments, loan rates, self-employment taxes, and interest compound growths.
Real Estate & Mortgage
Determine affordability, refinance benefits, and rental property yields.
Everyday / Life Utility
Secure, local random password generators, instant age calculations, and QR codes.
Text & Content
Word counters, text diff comparers, case text converters, and content clean utilities.
Marketing & SEO
Optimize meta tags, analyze keyword densities, and generate redirects.
Health & Fitness
BMI calculators, caloric targets, macro splitters, and target heart rates.
Legal & Employment
Calculate payroll timelines, severance, overtime, and contract terms.