Development

Spider Crawl Simulator

Simulate search engine spiders to crawl web pages. Check HTTP crawl status, response headers, and view the raw HTML page source online.

UUID Format Converter & Validator

Professionally handle UUID format conversions and validity checks. Supports multiple formats including standard, pure hex, and URN.

Java Regex Tester

Test Java regular expressions online. Real-time match verification and capture group extraction for faster debugging and development.

JSON to JSON Schema Converter

Automatically convert JSON data structures into JSON Schema definitions for seamless data validation and API documentation generation.

Kubernetes Image Mirror Finder

Find China mirror URLs for Kubernetes components to fix slow access to official registries.

Character Encoding Detector

Quickly identify text encoding types and fix gibberish text.

XPath Online Tester

Test XPath expressions right in your browser and see matches instantly — great for web scraping, data collection, and front-end debugging.

Mermaid Chart Generator

Generate Mermaid chart code online. Supports multiple types including flowcharts and sequence diagrams.

Golang Regex Tester

An online regex tester designed for Go developers. Validate RE2 syntax rules and view match results and capture groups in real-time.

C/C++ Code Formatter & Beautifier

Free online C/C++ code formatter and beautifier. Quickly standardize indentation, brace styles, and format your C and C++ code instantly.

Top-Level Domain (TLD) Directory

Search 900+ top-level domain suffixes worldwide in one place, including type, managing organization, and registration restrictions.

Cron Expression Generator

Generate Cron expressions online and visually configure scheduled tasks.

Shannon Entropy Calculator

Calculate the information entropy of text or data sequences to evaluate uncertainty and randomness.

Random File Generator

Generate random files of any size and format on demand, including text and binary data formats.

URL Unshortener

Paste a short link to quickly reveal the original long URL. Expand shortened URLs safely and check where they redirect before clicking.

JSON Minifier

Remove unnecessary whitespace from JSON and minify formatted data into a compact single line to boost transfer efficiency.

System and Browser Info Checker

Instantly check your client operating system, browser version, screen resolution, and other detailed system parameters in real time.

JSON to JavaScript Class Converter

Convert JSON data into ES6 JavaScript classes. Automatically generates nested classes and constructors to streamline your frontend development workflow.

ASCII Code Lookup & Converter

Convert between characters and ASCII codes. Supports decimal, hexadecimal, and binary formats.

C# Code Formatter

Free online C# code formatter and beautifier. Instantly standardize indentation, fix layout issues, and improve your code's readability.