What is a PDF Version?
PDF versions refer to different versions of the Portable Document Format (PDF), each defined by its own PDF specification document.
As a widely used document format, PDF has evolved over time with various versions. Each version, such as 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, and 2.0, has its own PDF specification document that defines its characteristics and capabilities.
PDF files are generally backward- and forward-compatible, allowing modern software to reliably display older PDFs.
Newer PDF versions introduce additional features and improvements.
To determine the version of a PDF file, the first line of the file header includes the identifier "%PDF-x.y," where "x.y" is the version number. However, in some cases, a PDF file can update its version via a special key when incremental updates are applied, to reflect changes or additions made to the file.
