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Checking a File's Type Without Uploading It

Published: Oct 19, 2026 | Updated: Oct 19, 2026 | About (Japanese)

Key points
  • Choose files
  • See the result
  • Use the result

Check a File's Real Type runs only inside your browser. The files you choose are never sent to a server.

Steps

  1. Choose files
  2. They are judged automatically
  3. Copy if needed
This is handy for files whose contents you do not want to share.
Use "Check a File's Real Type (Extension vs Contents)" (free)

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