File Metadata Viewer

What is File Metadata?

File metadata is information about a file that describes its characteristics, such as size, type, creation date, and other properties. This data helps systems and applications understand and process files correctly.

Features

• View file name and extension
• Display file size in bytes and human-readable format
• Show MIME type and file category
• Display last modified date and timestamp
• Extract image dimensions for image files
• Calculate aspect ratio and total pixels
• 100% client-side processing - no server uploads
• Support for all file types

MIME Types Explained

MIME (Multipurpose Internet Mail Extensions) types are standardized labels that identify file types on the internet. Common MIME types include:

• image/jpeg, image/png: Image files
• video/mp4, video/webm: Video files
• audio/mp3, audio/wav: Audio files
• text/plain, text/html: Text documents
• application/pdf: PDF documents
• application/json: JSON data files
• application/zip: Compressed archives

Use Cases

• Verify file types before uploading to websites
• Check image dimensions for web optimization
• Inspect file sizes for storage management
• Validate MIME types for application compatibility
• Debug file-related issues in development
• Analyze file properties for documentation

Privacy & Security

This tool processes all files entirely in your browser using JavaScript. No files are uploaded to any server, and no data is stored or transmitted. Your files and their metadata remain completely private and secure on your device.

Technical Details

• Uses the File API for reading file properties
• Supports all modern browsers (Chrome, Firefox, Safari, Edge)
• No file size limitations (processed locally)
• Image dimensions extracted using HTML Image element
• Timestamps displayed in local timezone