What does MIME Inspector do?

Compares extension and signature hints to identify potential type mismatches.

Does this run in the browser or on the server?

The utility logic runs in-browser for immediate analysis workflows.

Use outputs as QA evidence, then convert repeated checks into CI validations and runbooks.

MIME tool

Compare file extension, browser MIME, and magic-byte signature hints before an upload reaches your processing pipeline.

4Signals

QuickFirst-byte hint

BrowserNo server round trip

Use this when a filename says one thing but the actual file signature may point to a different type.

Select file

Example workflow

Input: renamed archive file `report.png` with ZIP signature bytes.
Expected output: extension suggests `.png` while the signature hint shows `ZIP / Office Open XML container`.
Action: route the file into quarantine or deeper validation instead of trusting the extension.