File Extension Lookup gives you a fast, focused way to identify the common MIME type and broad file category for a filename or extension. Everything runs locally in this tab.
✓ Optimized for analyzer tasks✓ Runs locally✓ Readable analysis summary with copy action
● Runs in your browserNo server uploads · No account
Enter the exact code, type, or identifier to look up.0 characters
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HOW TO USE IT
Get a reliable result in three steps
1
Provide the complete value or content you want to inspect.
2
Configure any search, parsing, or analysis options shown on the page.
3
Run the analysis and review the organized findings or metrics.
What this tool does
File Extension Lookup gives you a fast, focused way to identify the common MIME type and broad file category for a filename or extension. Everything runs locally in this tab.
The result is produced only after the input is checked. If the value cannot be processed, the workspace reports a specific error instead of guessing.
Features
Local browser processing
Purpose-built result metrics
Organized findings instead of raw diagnostic data
Prepared representative analysis example
Input and output
Input
text
Output
text
Processing
Local browser
Example
report.xlsx
Limitations
Review important output before using it in production.
Very large inputs remain subject to browser memory limits.
An extension is only a naming hint and does not prove a file’s actual content or safety.
Unknown and uncommon extensions are reported instead of guessed.