How to use File Type Checker
- Choose the source files or enter the requested value.
- Review detected facts, settings, and safety limits before processing.
- Download or copy only the result you have reviewed.
File Type Checker
Identify common file types from bounded magic bytes, container evidence, MIME, and filename extension.
You can also drop files anywhere in this panel.
Private by design. Only a bounded prefix is normally read; bounded ZIP inspection is used for Office container subtypes.
Choose any file to inspect its prefix.
Compare a filename extension with evidence found inside the file rather than trusting its name alone.
How OpenFileTools processes it
Local processing, explicit choices.
OpenFileTools performs this workflow locally after an explicit action. File bytes, paths, passwords, and results are not uploaded, persisted, logged, or added to URLs.
Questions, answered.
Is my input uploaded?
No. Processing stays in memory in this browser tab.
Does this change the original?
No. Any output is a separate download.
Related guide
Read the related guide