File Extensions Database

Explore a Vast Library of Over 50,000 File Extensions.

File Extensions Explained: Decoding File Types

File extensions, added as a suffix to file names with a period, reveal the file's format, organizing its data. These extensions, usually three or four characters long, vary widely, each linked to a unique file format. Common examples include:

  • .docx: Microsoft Word document
  • .pdf: Portable Document Format
  • .jpg: JPEG image
  • .mp3: MPEG audio file
  • .zip: ZIP archive file

Opening Files by Extension: Your computer selects the appropriate application based on the file's extension. For instance, a .docx file opens with Microsoft Word. This site offers a detailed guide on various file extensions, their meanings, associated applications, and instructions for changing extensions and converting file formats.

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