Adobe Acrobat is an application software and web services developed by Adobe Inc. It is used to view, create, manipulate, print and manage files in PDF (Portable Document Format). It can also import popular documents and image formats and save them as PDF. With Adobe Acrobat it is possible to modify the contents of paragraphs and images, but doing so does not repaginate the whole document to accomodate for a longer or shorter document. Acrobat can crop PDF pages, change their order, manipulate hyperlinks, digitally sign a PDF file, add comments, redact certain parts of the PDF file and ensure it's adherence to such standards as PDF/A.