File Extension Identifier

Identify file types by their extension and learn which programs can open them. Simply enter a file extension or upload a file to get detailed information.

Enter File Extension

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OR

Upload a File

About This Tool

The File Extension Identifier helps you understand what type of file you're dealing with and which software can open it. File extensions are the letters after the dot in a filename (like .pdf, .jpg, .docx).

How to Use

  1. Enter a file extension (without the dot) OR upload a file
  2. Click "Identify" to see detailed information
  3. Learn about the file type and compatible software

What You'll Learn

  • What type of file it is (document, image, video, etc.)
  • Which category it belongs to
  • The official MIME type
  • Which programs can open it
  • What the file is typically used for

Common File Extensions

  • Documents: .pdf, .docx, .txt, .xlsx, .pptx
  • Images: .jpg, .png, .gif, .svg, .webp
  • Video: .mp4, .avi, .mov, .mkv, .webm
  • Audio: .mp3, .wav, .aac, .flac, .ogg
  • Archives: .zip, .rar, .7z, .tar, .gz
  • Code: .html, .css, .js, .py, .java

Privacy

If you upload a file, only the extension is read - the file contents are never accessed or uploaded.