How to use
Drop the files to check or click “Choose files” (any format, several at once).
Select a file on the left to see the detected format and “Things to watch”, ordered by severity.
Review the details for its format: camera data, PDF pages and author, Office author and company, ZIP contents, and more.
Use “Fix with …” to open the right tool with the file already loaded, or “Use in another tool” for other processing.
What it does
Real format from the content
File signatures (magic numbers) identify PDFs, images, Office documents, archives, audio, video and executables, exposing mismatched or double extensions and right-to-left override tricks. Word/Excel/PowerPoint are identified by their internal structure.
Personal data before you share
Finds photo GPS, author names and serial numbers; PDF authors, comments and attachments; Office authors, last editors, company, comments, tracked changes and hidden sheets/slides.
Risks before you open
Warns about Office macros, PDF JavaScript, scripts in SVG, executables, zip bombs, path-traversal entries and executables inside archives.
Fast on big files
Only the parts needed are read, so multi-GB archives and videos are inspected without extracting or playing them.
Fix it right away
Fixable issues (e.g. removing GPS, fixing encodings) hand the file straight to the right tool.
Use cases
- Check an email attachment for fake extensions, macros or JavaScript before opening it
- Make sure a photo has no GPS location or author name before posting it
- Check Word/Excel files for author names, tracked changes, hidden sheets or comments before sending them
- Find out why a file will not open: wrong extension or a truncated download
- List a ZIP’s contents without extracting and spot garbled names or junk files
Supported formats
Detailed analysis
Format detection only
Capability matrix
| Feature | Support | Notes |
|---|---|---|
| Format detection by content, fake extension detection | Supported | — |
| Metadata and personal data in images, PDFs, Office files | Supported | — |
| Macros, JavaScript, zip bombs and other risks | Supported | — |
| List 7z / RAR contents | Not supported | — |
| Virus scanning | Not supported | Not a replacement for antivirus software |
| Legacy Office formats (.doc/.xls/.ppt) | Partial | Macro detection only |
Limits & notes
- This is not antivirus software. No “Danger” finding does not mean a file is safe.
- PDF details up to 150 MB; text and image metadata are read from the first 16 MB.
- ZIP listings cover the first 5,000 entries (500 shown). Encrypted entries are not read.
- Audio/video duration is shown only for formats your browser supports.
Privacy & safety
Files are inspected on your device only. Nothing is uploaded or stored, and results are not recorded.
FAQ
Does renaming the extension change the format?
How do I remove GPS location from a photo?
Where do Word or Excel author names show up?
Can this tool scan for viruses?
Are my files uploaded?
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