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Check a file's true type from its contents
Have you ever found a file on your computer without an extension, or with an incorrect extension? CheckFileType.com helps you determine the true file type of any file based on the content of the file, not the extension. Just upload the file and we will test it and show you the results.
CheckFileType does not require an e-mail or registration. It is a quick tool to help you find the right file extension for an unrecognized or unknown file type.
What is a file type?
Every file has a particular format, and files are either binary or ASCII. Common ASCII files are plain text, or more structured text such as PDF or XML. Common binary files are images (JPEG, GIF, PNG) or compressed files. Formats can also be layered: a DOCX or PPTX file is a collection of ASCII XML files inside a ZIP archive, which makes it binary.
For some files, such as ZIP archives, this tool can look inside and report the file type of each file contained in the archive.
About your privacy
We store your file only temporarily for processing, and after one hour it is permanently removed from our server. Your file transfer is secured with up-to-date encryption.