Use File Type Checker
- The extension may be wrong.
- A tool rejected the file as unsupported.
- You need magic-byte and MIME-like identity signals.
Tool comparison
File Type Checker vs File Metadata Viewer
File Type Checker answers what the bytes look like. File Metadata Viewer summarizes available file details. Use them together when a file fails, looks renamed, or came from an unknown source.
Decision
Which one fits the task?
Use File Metadata Viewer
- You need size, name, last-modified, or browser-provided file details.
- You are documenting a file handoff.
- You want a lightweight local report before another action.
Avoid
Common mistake
Neither tool is a malware scanner. They report identity and metadata signals, not whether content is safe to execute.
Quality
Review before you finish
Quality notes
- Use archive listing before extracting unknown ZIP files.
- Use checksums when byte-level equality matters.
- Use format-specific inspectors for PDFs, images, DOCX, CSV, and archives.
Next steps
- If the type mismatches the extension, stop and inspect before conversion.
- If the file type is right but unsupported, use a format-specific checker.
- If sharing the file, consider metadata and checksum review.
Tools