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File Type Checker

File Format Detector

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Struggling to figure out a file's format or dealing with the wrong file extension? Meet our easy-to-use File Type Checker! It’s designed for everyone, whether you're a tech wizard or not. Just upload your file, and we’ll instantly recognize its true format—no downloads or installations needed. Fix incorrect file extensions quickly, avoid opening risky files, and make sure your files work with the right software. Whether you’re looking for a format recognizer, file format detector, or a reliable rename tool, our tool makes file management stress-free. Try it today and see how easy managing your files can be!

How to check the real format of a file online

The detector reads the binary signature of a file instead of trusting its extension, then reports the true format, a security assessment and a corrected file name.

  1. Upload any file — the format is read from the content itself, so a wrong or missing extension is not a problem.
  2. Click Check and Fix File Now. The signature is matched against known formats and the content is scanned for risky constructs.
  3. Read the file information table: real extension, MIME type, size, last modified date and a short summary of what is inside.
  4. Check the security analysis — file name risk, content risk level, malicious indicators, affected platforms and recommendations.
  5. Download the file with the corrected extension. A name shown in red means the original extension did not match the content.

Files are deleted from our servers after 24 hours, and download links stop working after that.

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