Does this inspect a file?

No. It only maps text through a local MIME registry.

Can one extension have multiple MIME types?

Yes. The tool returns known related records.

Can a MIME type have several extensions?

Yes. Known extensions are shown from the dataset.

Is the lookup uploaded?

No. The registry is loaded and searched locally.

MIME Type & File Extension Lookup

Map filenames, extensions, and Content-Types using a local registry dataset.

Local browser processing

Your input is processed only in this browser and is not uploaded, stored, or proxied.

Input

Result

What this tool does

Enter a filename, extension, or MIME type to find known mappings in the local registry dataset. Extension lookup is not file-content detection, so use the linked file-type checker when you need to inspect bytes.

How to use it

Enter or import the content you want to process.
Choose the required options and run the tool.
Review the output and limitations, then copy or download it.

Capabilities and limitations

Mappings come from the bundled registry version. An extension can have multiple mappings and cannot prove a file’s actual bytes, safety, or content.

Related tools

File Type Checker Favicon Generator

Frequently asked questions

Does this inspect a file?: No. It only maps text through a local MIME registry.
Can one extension have multiple MIME types?: Yes. The tool returns known related records.
Can a MIME type have several extensions?: Yes. Known extensions are shown from the dataset.
Is the lookup uploaded?: No. The registry is loaded and searched locally.