Free Developer Tools

Create QR codes for free for websites, text, WiFi and many other types. Support PNG, SVG download.

Features:

• Tạo QR code cho URL, text, WiFi
• Download PNG, SVG, PDF
• Tùy chỉnh màu sắc và kích thước
• Bulk QR code generation

Generate secure, random passwords with customizable settings and real-time strength analysis.

Features:

• Uppercase Letters (A-Z)
• Password Strength
• Password Length
• Copy to Clipboard

Format, validate and beautify JSON data. Support minify, validate syntax and error detection.

Features:

• Format và prettify JSON
• Validate JSON syntax với error detection
• Minify JSON để tối ưu kích thước
• Upload/Download JSON files

Convert text between different case formats: uppercase, lowercase, camelCase, PascalCase, snake_case, kebab-case and many more. Free and fast online tool.

Features:

• UPPERCASE, lowercase conversion
• camelCase, PascalCase, snake_case
• Title Case, Sentence case
• Bulk text processing

Encode and decode Base64 text quickly and securely. Supports text, files, and URL-safe encoding with validation.

Features:

• Encode/Decode Base64 text
• File to Base64 conversion
• URL safe encoding
• Validation và error handling

Optimize, resize, and convert images with advanced compression algorithms. Reduce file size while maintaining quality.

Features:

• Smart compression algorithms
• Batch image processing
• Format conversion (JPEG, PNG, WebP)
• Resize with aspect ratio preservation

Generate MD5, SHA-1, SHA-256, SHA-512 hashes for text and files. Verify data integrity and compare hashes.

Features:

• MD5, SHA-1, SHA-256, SHA-512
• File Hashing
• Hash Verification
• Multiple Algorithms

Generate Lorem Ipsum placeholder text with multilingual support: Vietnamese, English and classic Latin.

Features:

• Multi-language Support
• Flexible Output
• HTML Support
• Easy Export

Test and debug Regular Expression with live preview, match highlighting and common patterns library

Features:

• Live regex testing với highlight
• Match groups và captures
• Regex cheat sheet
• Common patterns library

Generate beautiful color palettes for design with AI-powered suggestions, export CSS, SCSS, Adobe Swatch

Features:

• AI-powered color suggestions
• Export CSS, SCSS, ASE
• Color harmony rules
• Accessibility checker

Generate dummy text for design and development. Multiple languages and formats.

Features:

• Classic Lorem Ipsum
• Tiếng Việt dummy text
• Custom word count
• HTML/Markdown format

Format and beautify CSS code with various customization options. Support minify, validate and auto-fix CSS.

Features:

• Smart Formatting
• CSS Validation
• CSS Minification
• Detailed Statistics

Comprehensive unit converter with high accuracy

Features:

• High Accuracy
• Real-time
• Comprehensive
• Easy to Use

Powerful text comparison tool to detect and highlight differences between two pieces of text or files.

Features:

• Real-time comparison as you type
• Support for multiple text file formats
• Flexible comparison options
• Export results in multiple formats

Format and beautify SQL queries with multi-database support and detailed customization options.

Features:

• Multi-Database Support
• Highly Customizable
• Real-time Formatting
• Multiple SQL dialects

Look up IP address information - location, ISP, timezone, security info.

Features:

• Geolocation lookup
• ISP và organization info
• Security threat detection
• Bulk IP lookup

Real-time Markdown editor with live preview. Support GitHub Flavored Markdown and export.

Features:

• Live preview
• GitHub Flavored Markdown
• Export to HTML, PDF
• Vim/Emacs keybindings

Create beautiful code snippets with syntax highlighting for sharing

Features:

• Multiple programming languages
• Beautiful syntax highlighting
• Custom themes và backgrounds
• Export PNG, SVG, Copy to clipboard

Automatically generate test cases from software requirement documents using AI (OpenAI GPT or Google Gemini)

Features:

• Support PDF, DOCX, TXT files
• AI-powered test case generation
• Export professional Excel format
• Positive, negative and edge cases

Test website speed with detailed metrics. Performance optimization tips.

Features:

• Core Web Vitals measurement
• Performance score
• Optimization recommendations
• Mobile và desktop testing

Generate meta tags for SEO and social media. Open Graph, Twitter Cards preview.

Features:

• SEO meta tags generation
• Open Graph tags
• Twitter Cards
• Live preview

Create cron expressions easily with visual interface. Explain and validate.

Features:

• Visual cron builder
• Expression validation
• Human readable explanation
• Next run times preview