Information & Tools
Explore our comprehensive collection of articles and useful tools to help you work with files and file extensions.
📚 Educational Articles
File Basics
- What are file extensions? - Learn the fundamentals of file extensions and why they matter
- Folders, files and paths - Understanding file system organization
- File extensions and MIME types - How browsers and servers identify file types
- Common file formats explained - Guide to popular document, image, video, and audio formats
Opening Files
- How to open files on Windows - Step-by-step guide for Windows users
- How to open files on Mac - Opening files on macOS and OS X
- How to open files on Linux - Working with files in Linux distributions
- Opening files on mobile devices - iOS and Android file handling
Security & Best Practices
- File extensions and security - Protecting yourself from malicious files
- Dangerous file extensions to watch out for - Common threats and how to avoid them
- File encryption basics - Keeping your files secure
Technical Information
- Windows registry - Understanding file associations in Windows
- File compression explained - ZIP, RAR, 7Z and other archive formats
- Converting between file formats - Tools and techniques for file conversion
- Hidden file extensions in Windows - How to show or hide file extensions
🛠️ Free Online Tools
📋 File Analyzer
Upload a file to identify its type, read metadata, and get detailed information about its format and properties.
🔍 Extension Search
Search our database of file extensions to find which programs can open specific file types.
🔬 Hex Viewer
View the hexadecimal representation of any file to analyze its binary structure.
🔐 File Hash Calculator
Calculate MD5, SHA-1, SHA-256 hashes for file integrity verification.
🔤 Text Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and more.
🔐 Base64 Encoder/Decoder
Encode text or files to Base64, or decode Base64 strings back to text.
📝 JSON Formatter
Format, validate, and minify JSON data with syntax error detection.
📖 Quick Reference
- 100 most common file extensions - Quick reference guide
- Image formats comparison - JPEG vs PNG vs GIF vs WebP
- Video formats comparison - MP4, AVI, MKV, MOV explained
- Audio formats comparison - MP3, WAV, FLAC, AAC guide