LOCAL DIAGNOSTIC STATION / FREE
File Extension Mismatch Checker
Check whether a file extension agrees with its detected internal format.
READY FOR LOCAL ANALYSISNO UPLOAD · NO ACCOUNT
No file selected
Your diagnostic report will appear here. We explain uncertain results instead of promising guaranteed repair.
RELATED HELP
Repair guidance
SAFE TROUBLESHOOTING
Wrong File Extension: How to Identify the Real Format
Opening errors sometimes result from a wrong filename suffix rather than actual file corruption.
Read steps ↗SAFE TROUBLESHOOTINGHow to Fix a ZIP File That Will Not Open
ZIP archive problems often come from incomplete transfers, damaged central directory records or unsupported encryption.
Read steps ↗SAFE TROUBLESHOOTINGPDF Not Opening? Diagnose and Recover Safely
A PDF can fail to open because of an incomplete download, extension mismatch or damaged cross-reference information.
Read steps ↗