calculatory.app

Developer Tools

7 free tools for developers. No sign-up, no ads in the way — just fast, accurate utilities that run in your browser.

JSON Formatter & Validator

Beautify, minify, and validate JSON instantly, with clear error messages and byte size for syntax problems.

QR Code Generator

QR codes for links, text, email, WiFi, vCards, locations and social profiles, with custom shapes. PNG or SVG.

Password Generator

Generate strong, cryptographically random passwords with custom length and character sets. Includes strength meter and batch generation.

UUID Generator

Generate random version 4 UUIDs (GUIDs) in bulk, with uppercase, no-hyphens, and braces formatting options.

Base64 Encoder / Decoder

Convert text to Base64 or decode it back instantly, with full Unicode support and URL-safe encoding.

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and back. Supports seconds, milliseconds, and multiple time zones.

Binary to Decimal Converter

Convert between binary, decimal, hexadecimal, and octal number systems instantly. Essential for developers.

About these tools

This category covers the utility tasks developers reach for daily — formatting a payload, generating an ID, decoding a string, checking a timestamp. Every tool runs entirely in your browser: no data is sent to a server, no account is needed, and nothing is stored outside your own machine.

The JSON Formatter validates and pretty-prints JSON with precise error locations. The QR Code Generator encodes URLs, WiFi credentials, vCards, locations and more, with custom module and eye shapes, and exports to PNG or SVG. The Password Generator and UUID Generator both use the Web Crypto API for cryptographically secure randomness. The Base64 Encoder / Decoder handles full Unicode text correctly, including a URL-safe alphabet option. The Unix Timestamp Converter handles both seconds and milliseconds across time zones, and the Binary to Decimal Converter converts across binary, decimal, hexadecimal and octal simultaneously.

A Markdown to HTML converter and a regex tester are planned in upcoming phases.