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File Info Inspector
Check a file's true type, size, and hashes
Free
No sign-up
Medium
About this tool
Inspect any file's real type by its binary signature (not just its extension), size, SHA-256/MD5 hashes, and basic details.
Frequently asked questions
What does "doesn't match claimed type" mean?
It means the file's actual binary signature doesn't match what its extension or upload content-type suggests — for example, a file renamed from .exe to .jpg. This is a useful quick check before trusting an unfamiliar file.
What file types can this detect?
Common formats identifiable by their binary signature — images, archives, PDFs, and more. Unrecognized formats will simply show as unknown.