All developer tools
Every tool in this list runs entirely in your browser. No data ever leaves your device. Pick a category to jump straight to the right utility.
Encoding tools
Convert data between text-safe and binary forms — Base64, URL encoding, JSON escapes, Unicode, JWT, Morse.
Base64 Encoder / Decoder
Encode and decode text or files using Base64 encoding
URL Encoder / Decoder
Encode and decode URL components and full URLs
Unicode Converter
Convert text to Unicode code points and vice versa
JSON Escape / Unescape
Escape and unescape strings for use in JSON
Morse Code Converter
Encode text into Morse code or decode Morse code back to text. Supports International Morse (ITU) including letters, digits, and punctuation.
JWT Decoder
Decode and inspect JSON Web Tokens. Pretty-prints header and payload, and surfaces standard claims like exp / iat / sub.
Crypto tools
Hashing, HMAC, and AES utilities you can verify locally before shipping into your application.
Time tools
Convert Unix timestamps and parse cron schedules without leaving the page.
Format tools
Pretty-print and minify JSON, SQL, XML, and YAML/.properties for review and debugging.
Dev tools
Practical utilities developers reach for daily: regex, UUID, IDs, Nginx, and validation tooling.
China ID Generator
Generate and validate Chinese ID card numbers
Regex Tester
Test and debug regular expressions with real-time highlighting
Business License Number Generator
Generate and validate Chinese Unified Social Credit Codes (统一社会信用代码)
Nginx Config Generator
Generate nginx configuration files by selecting options. Supports SSL, reverse proxy, caching, security headers, and more.
Bank Card Number Generator & Validator
Generate and validate bank card numbers using the Luhn algorithm. Detects card brand (Visa, Mastercard, Amex, UnionPay, etc.) and identifies common Chinese bank BINs.
UUID / ULID Generator
Generate UUIDs (v1, v4, v7) and ULIDs in bulk. UUID v7 is timestamp-prefixed and lexically sortable — great for database keys.
Number to Chinese Capital
Convert numbers to formal Chinese capital characters (壹贰叁) used on invoices, contracts, and financial documents. Also produces simple (lowercase) Chinese.
Visual tools
Generate QR codes, render Graphviz diagrams, and translate colors across formats.