File Type Detector
Inspect file signatures and content hints, and identify extensions that deserve a closer look.
Your files, on your device
2 credits per completed taskDrag files here, or use the controls below. File contents stay on this device.
No files selected
Selected paths
Reads up to 64 KiB per file for signature and text hints. ZIP-based Office files are reported as ZIP containers. Detection does not prove a file is safe or fully valid.
Choose files to begin.
How to use File Type Detector
- Choose your source files. Folder pickers preserve nested file paths where supported.
- Review the selection and available settings. Archive directories and rename previews can be inspected before processing.
- Select Inspect file contents, review the result, then download the files or report.
Privacy and practical limits
File contents are processed by local browser workers. The website checks your normal tool-credit allowance; files are not sent with those requests. Cancelling an unfinished task stops its worker. Keep the original files for comparison.
Reports display 100 rows per page and support filtering. Downloads contain the full result. Folder pickers do not expose empty directories. This tool handles the formats described above; it does not claim support for every archive or file format.
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