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File helpers

File Extension Lookup

Find common MIME types and format names for a file extension. Renaming a file does not convert it.

Workspace⌁ Processed on your device

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Processed on your device

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How it works

Find common MIME types and format names for a file extension. Renaming a file does not convert it. Enter your values or try the example. Run the action, check the result and copy or download it. Your input remains editable after an error.

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Example

.pdf → application/pdf
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When to use this tool

Look up an extension when configuring accepted files or a server response header.

Supported formats & limits

Reference table only; an extension does not prove the file’s actual type.

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Good to know

What happens when I change the input?

An edited input needs a new result. Run the action again; previous download links are removed so you cannot mistake an old output for the current one.

Are my files uploaded?

Your files and pasted content are processed in temporary browser memory and are not uploaded for processing. App preferences store only tool IDs, language and theme. There are no accounts, ads or automatic error reports. Closing the page discards your workspace; download results you want to keep. Production pages use Google Analytics for visit statistics; see the Privacy page for details.