Developer Tools
JSON, UUID, Base64, JWT, URL encoding, timestamps, and colors
Available Developer Tools (9)
JSON Formatter & Validator
Prettify, minify, validate, and format JSON code with syntax diagnostics.
UUID / GUID Generator
Generate cryptographically random UUID v4 strings in bulk with custom casing.
Base64 Encoder & Decoder
Encode and decode UTF-8 text and files/images to Base64 format.
JWT (JSON Web Token) Decoder
Decode JSON Web Tokens instantly to inspect header, payload, and expiry.
URL Encoder & Decoder
Safely encode or decode URLs and query parameters.
Unix Timestamp Converter
Convert Unix epoch timestamps to human dates in UTC and Cambodia ICT (UTC+7).
Color Converter & Generator
Convert HEX, RGB, HSL, CMYK, inspect contrast ratios, and copy CSS values.
QR Code Generator
Create custom QR codes for URLs, text, Wi-Fi, and phone numbers with PNG download.
Strong Password Generator
Generate secure, unbreakable passwords with customizable characters and strength meter.
About Client-Side Developer Utilities
Built specifically for software engineers, systems administrators, and cybersecurity professionals, our Developer Tools handle daily engineering tasks with strict zero-knowledge privacy. Parse, format, and minify JSON payloads, generate cryptographically secure UUID v4 tokens, encode and decode Base64 and URL parameters, and inspect JWT claims without ever leaking intellectual property or credentials across the network.
Related Documentation & Guides
View all guides →Client-Side Security Guide: Why In-Browser Tools Protect Your Sensitive Data
Learn how modern WebAssembly and JavaScript enable private, 100% in-browser utilities that guarantee zero data leakage, ideal for API keys, JSON payloads, and sensitive tokens.
Deep Dive into QR Code Technology, Reed-Solomon Error Correction & KHQR Standards
Understand the mathematical matrix geometry of 2D barcodes, Reed-Solomon burst error correction algorithms, and how EMVCo and KHQR power national payment networks.
A Developer's Comprehensive Guide to Digital Color Models: HEX, RGB, HSL & OKLCH
Learn how modern screens render light through sRGB gamuts, understand 24-bit hexadecimal math, master HSL cylinder projections, and design accessible WCAG color palettes.
Developer's Guide to JSON Formatting, Validation, and Standards
A deep exploration of RFC 8259 specifications, syntax rules, formatting techniques, common parsing traps (trailing commas, single quotes), and robust debugging patterns.