File mime type checker

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📁 File MIME Type Checker – Detect the Real Type of Any File

Check file extensions, content type, and ensure secure validation

Use our free File MIME Type Checker to analyze and validate the actual MIME type of any file. This tool helps developers, system admins, and security teams to identify mismatches between file extensions and real file formats – essential for secure file uploads, malware prevention, and web development.

Simply upload a file, and we'll show its real content type, extension, and media type (MIME) – based on binary signature, not just the file name.

🔍 What Does the MIME Type Checker Analyze?

  • 📄 File name and extension (e.g. .jpg, .exe, .pdf)
  • 📦 MIME type based on file content (e.g. image/jpeg, application/pdf)
  • ⚠️ Extension vs content mismatch detection
  • 🧩 Binary file signature (magic number)
  • 🔐 Upload safety checks for common vulnerabilities

🛡️ Why File MIME Type Validation Matters

  • ✅ Prevent security risks like disguised executables
  • ✅ Avoid file type spoofing in web forms & APIs
  • ✅ Enforce safe upload policies in CMS & apps
  • ✅ Ensure correct handling by web servers & browsers
  • ✅ Maintain data integrity in file storage systems

📈 Sample Result Overview

Attribute Example Output
File Name document.pdf
Extension .pdf
Detected MIME Type application/pdf
Content-Type Match Yes ✅
Binary Signature 25 50 44 46 (PDF)

🌍 Supported File Types

Our MIME checker works with a wide range of file types:

  • 📷 Images (.jpg, .png, .gif, .svg)
  • 📄 Documents (.pdf, .docx, .xlsx, .txt)
  • 🎵 Audio (.mp3, .wav, .ogg)
  • 🎞️ Video (.mp4, .avi, .mov)
  • 📦 Archives (.zip, .rar, .7z, .tar.gz)
  • 💻 Executables (.exe, .sh, .bat)
  • 💡 And many more

🔒 100% Privacy-Focused

Your uploaded file is not stored and is processed only in-memory for analysis. We respect your privacy – always.

🚀 How to Use the MIME Type Checker

  1. Click "Choose File" and upload any document
  2. Wait a few seconds for analysis
  3. Review the MIME type, extension, and any mismatches

💡 Pro Tip: Combine with Other File & Domain Tools

Pair this checker with our Safe URL Checker, HTTP Headers Tool, or SSL Certificate Checker to audit complete web uploads and hosting environments.

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