Good to know

  • The type comes from the decoded bytes and never from what a data URI claims. A data URI is text someone typed; the signature is what the file actually is.
  • ZIP is a container, so a .docx, an .odt and an .epub all start with the same four bytes. The two that name their own media type inside — OpenDocument and EPUB — are identified exactly; the rest stop at ZIP.
  • The first sixteen bytes are shown as hex and as text. That is the part every rule here looks at, so it is also the part to compare by hand when nothing matches.
  • The download is built in your browser from the decoded bytes. Nothing is sent to the server.
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