WebToolsHub Client-Side

File Metadata Viewer — Inspect File Type, MIME & Attributes

Inspect file name, exact size, MIME type, last modified date, and magic bytes.

Interactive Tool Workspace

Loading secure in-browser engine for File Header & MIME Inspector...

Processing Limits & Device Capabilities

Processed client-side in browser memory. Recommended maximum file size is 50 MB on desktop and 15 MB on mobile.

Zero Cloud Transmission: Zero bytes are uploaded to any server. File handling is constrained only by available device RAM.

How to Use File Header & MIME Inspector

  1. Select or drag any file from your computer.
  2. Instantly inspect exact bytes, MIME type, and last modified date.
  3. View the first 16 magic bytes in hexadecimal to identify file signatures.

About File Header & MIME Inspector

File Header & MIME Inspector examines the binary metadata of local files to diagnose mismatched extensions, corrupted headers, and verify true MIME signatures.

Frequently Asked Questions

What are magic bytes?

Magic bytes are the first few bytes of a file that identify its true file format, regardless of what file extension it has.

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