offlinewebtools.com — free, watermark-free browser tools that stay on your device with nothing uploading to our servers

MIME Type Detector

Drop any file to discover its MIME type before uploading or emailing. Prevents mismatched content-types that break downloads.

Free to use, no watermarks, runs in your browser—nothing uploads to our servers

Drop a file or browse We never upload your data

File name

No file selected

Size: --

Detected MIME type:

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MIME types instruct browsers and email clients how to handle files. Sending a PDF labelled as plain text may force downloads or break inline previews. Use this detector to double-check files before sharing.

Report a bug

If this tool misbehaves, share a quick summary so we can investigate. We include the tool URL automatically—no need to copy and paste.