For cleaning up the metadata, there is a paid service. Ø Metashield Analyzer - It provides a free analysis of metadata in documents. Ø ExtractMetadata - An online metadata viewer that provides users with an option to upload files, or feed a URL which hosts the relevant PDF file. Ø MetaWiper - Very robust metadata online viewer and editor with support for manipulating metadata in multiple files. A few such examples are provided as follows: Many PDF metadata viewers are available online that help to extract metadata from PDF file, and then display it accordingly, which then subsequently helps to remove metadata from PDF file.

Among the offline softwares, the free version of Adobe Professional provides this feature, while the paid version offers manipulation of metadata as well. There many ways to view the metadata in a PDF file, both online and offline. Metadata is very commonly found in PDF files as the applications that are used to generate the PDF applications typically populate it automatically remove metadata from PDF file. XMP mechanism is more robust and powerful in comparison to the Info Dictionary method, and thus, it is the most widely used metadata standard for PDF files. Metadata in a PDF file is not usually compressed, and thus in the documents that are unencrypted, it appears in a format that is readable by all users. A valid mechanism for storage of data in PDF file uses the XML format with the help of XMP (Extensible Metadata Platform) entries the other mechanism being the Info Dictionary, which usually consists of data pairs with key and corresponding matching values. The data about data, in other words metadata, is a well known risk area for PDF files, as it can be placed at any place within a file.

The essential structure of PDF files involves a format which is binary in nature, with language that is loosely hinged on the PS (Post Script) language. With an increase in the usage of PDF files, much research has gone into identifying the kind of hidden data that may be contained by PDF files, along with their associated risks. The major reason that it is so successful is that it has appearance retention ability with regards to content that can span multiple types of clients, lesser unwanted leakage of data, and a broad set of features that provide support to varying user requirements. PDF file - how to remove metadata from PDF file or Portable Data Format is almost a de-facto standard when it comes to sharing documents and other information with the help of electronic means.

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