ken η«ιΏε·₯ε ·
Ken Webmaster Tools is a free online toolset for developers and webmasters. All tools run entirely in the browser β no backend server, no data upload. Currently offering 19 tools including timestamp conversion, JSON formatting & validation, Base64 image conversion, password generation, Cron expression parsing, case conversion, QR code generation, hash calculation, encoding conversion, regex testing, config format conversion, AES/DES/RSA encryption/decryption, BMI calculator, random data generator, image compressor, world clock, Roman numeral converter, number to Chinese converter, and loan calculator. Covers everyday scenarios in development, deployment, and security.
All Tools
Tool Categories
Development
JSON formatting & validation, regex testing, case conversion, encoding conversion β essential tools for daily coding.
Security & Encryption
Hash calculation, AES/DES/RSA encryption, password generator β for data protection and password management.
Format Conversion
Timestamp & date conversion, Base64 & image conversion, YAML/TOML/JSON config format conversion.
Utilities
QR code generation, Cron expression parsing β handy tools for everyday needs.
Use Scenarios
Web Development
Quickly format JSON during API integration, write and test regex patterns, convert naming conventions and URL encoding.
DevOps & Deployment
Convert timestamps to readable dates, parse Cron expressions, transform config files between YAML, TOML, and JSON.
Security Needs
Compute hashes for files and strings locally, encrypt sensitive configs with AES/RSA, generate strong random passwords.
Why Choose Us
Client-Side Processing, Privacy First
All computation happens in your browser. Your data never leaves your device β safe for handling code, configs, and sensitive keys.
Completely Free, No Sign-Up
All tools are free with no usage limits. No registration, no login, no configuration required. Just open and use.
Built for Developer Experience
Clean terminal-inspired UI, responsive design for desktop and mobile. Double-click to copy results, real-time preview, and more.
Hot News
π₯ Hot Articles
What is JSON? How to Format, Validate and Parse JSON Data
Complete guide to JSON format: learn JSON syntax rules, common mistakes to avoid, how to format JSON in JavaScript/Python/Go, and best practices for API development.
Base64 Encoding Explained: How It Works and When to Use It
Learn how Base64 encoding works, why it increases file size by 33%, and practical use cases like embedding images in HTML, JWT tokens, and URL-safe encoding.
How to Install Docker and Docker Compose on Ubuntu: Complete Guide
Step-by-step guide to install Docker Engine and Docker Compose on Ubuntu. Includes registry mirror setup for China, proxy configuration, and post-installation tips.
How to Set Up a K3s Kubernetes Cluster on Ubuntu: Step-by-Step
Complete guide to deploying a K3s cluster on Ubuntu with system initialization, Docker configuration, NFS storage setup, and Helm installation for production workloads.
DeepSeek AI Guide: Features, Pricing, API Integration and Local Deployment
Complete DeepSeek AI guide covering model capabilities, API usage with OpenAI-compatible endpoints, local deployment with Ollama, and practical tips for developers.
Typeless AI Writing Tool Review: Why I Switched After One Month
Honest Typeless review from a daily user: how AI-assisted writing in flow state mode transformed my writing workflow. Features, pricing, and who it is for.
Obsidian Review: Why I Switched from Notion After Two Years of Daily Use
Two-year Obsidian review covering bidirectional links, graph view, plugin ecosystem, daily notes workflow, and why local-first Markdown beats cloud-based note apps.
Codex CLI vs Claude Code vs Cursor: Which Ships Better Code?
I tested Codex CLI, Claude Code, and Cursor on real projects for 6 months. Honest comparison of setup, workflow, debugging, and which tool wins your use case.
Frontend
More βWhat is JSON? How to Format, Validate and Parse JSON Data
Complete guide to JSON format: learn JSON syntax rules, common mistakes to avoid, how to format JSON in JavaScript/Python/Go, and best practices for API development.
Base64 Encoding Explained: How It Works and When to Use It
Learn how Base64 encoding works, why it increases file size by 33%, and practical use cases like embedding images in HTML, JWT tokens, and URL-safe encoding.
DevOps
More βCron Expression Guide: Syntax, Examples and Common Schedules
Complete cron expression tutorial covering 5-field syntax, special characters, common scheduling patterns, and real-world examples for Linux, Node.js and GitHub Actions.
IP Address Basics: IPv4 vs IPv6, CIDR Notation and Subnetting
Learn IP addressing fundamentals: IPv4 structure, IPv6 simplified notation, private address ranges, CIDR subnetting explained with examples for network configuration.
How to Install Docker and Docker Compose on Ubuntu: Complete Guide
Step-by-step guide to install Docker Engine and Docker Compose on Ubuntu. Includes registry mirror setup for China, proxy configuration, and post-installation tips.
How to Set Up a K3s Kubernetes Cluster on Ubuntu: Step-by-Step
Complete guide to deploying a K3s cluster on Ubuntu with system initialization, Docker configuration, NFS storage setup, and Helm installation for production workloads.
Security
More βAI
More βDeepSeek AI Guide: Features, Pricing, API Integration and Local Deployment
Complete DeepSeek AI guide covering model capabilities, API usage with OpenAI-compatible endpoints, local deployment with Ollama, and practical tips for developers.
How to Use DeepSeek for Programming: Tips for Code Generation and Debugging
Practical DeepSeek coding tips for developers: prompt engineering strategies, code review workflows, multi-file context management, and common pitfalls to avoid.
Typeless AI Writing Tool Review: Why I Switched After One Month
Honest Typeless review from a daily user: how AI-assisted writing in flow state mode transformed my writing workflow. Features, pricing, and who it is for.
Obsidian Review: Why I Switched from Notion After Two Years of Daily Use
Two-year Obsidian review covering bidirectional links, graph view, plugin ecosystem, daily notes workflow, and why local-first Markdown beats cloud-based note apps.
Codex CLI vs Claude Code vs Cursor: Which Ships Better Code?
I tested Codex CLI, Claude Code, and Cursor on real projects for 6 months. Honest comparison of setup, workflow, debugging, and which tool wins your use case.