Identifying unknown file formats
www.file-extensions.org › article › identifyingApr 11, 2011 · Each individual file format has same initial hex code, that helps applications to identify it, regardless of its file extension. For example a ZIP file or any file that is in ZIP format, no matter its file extension starts with "PK"or "50 4B" in Hex. Those two values indicate, that the file is compressed with ZIP compression method and can be decompressed with most, if not all archivers.
CheckFileType.com - Free Online File Type Checker
www.checkfiletype.comEvery file has a particular format. Files are either binary or ascii. Common ascii files would be simple text or more complicated formatted text such as PDF or XML. Common binary files are images (jpeg, gif, png) or compressed files. But the file formats can be layered, such as DOCX or PPTX. These are a collection of ascii XML files in a zip archive which makes it a binary file.
Analyze file format online - Aconvert.com
https://www.aconvert.com/analyze.html16.09.2021 · Not sure what format your file is? Just upload it and let our server analyze the file's binary signatures to identify what exactly format your file is. The analysis results will show all possible file formats. For example: If you submit a DOCX file, the analysis results will identify the file both DOCX format and ZIP format.