What is the structure of PDF?

What is the structure of PDF?

Document structure. A PDF document consists of objects contained in the body section of a PDF file. Most of the objects in a PDF document are dictionaries. Each page of the document is represented by a page object, which is a dictionary that includes references to the page’s contents.

How do I check the specs of a PDF?

Once downloaded, simply open your pdf file in Adobe Acrobat Reader, press Ctrl+D or File > Properties (Document Properties). And voilà! In the Advanced Information section, you will find ‘Page size’. Now, if you want to know your dimensions in units other than inches, simply convert it (1 inch -> 2.54 cm).

How are PDF files coded?

PDF character encoding determines the character set that is used to create PDF files. You can choose to use Windows1252 encoding, the standard Microsoft Windows operating system single-byte encoding for Latin text in Western writing systems, or unicode (UTF-16) encoding.

What is Startxref in PDF?

The startxref tells the PDF viewer the byte offset of the most recent xref .

What are PDF standards?


PDF Standard Introduced Purpose
PDF/X since 2001 “Prepress digital data exchange using PDF”
PDF/A since 2005 “PDF Archive”
PDF/E since 2008 “PDF Engineering”
PDF since 2008 “Portable Document Format”

What information does a PDF file contain?

PDF files may contain a variety of content besides flat text and graphics including logical structuring elements, interactive elements such as annotations and form-fields, layers, rich media (including video content), three-dimensional objects using U3D or PRC, and various other data formats.

How do I know if my PDF is A3 or A4?

1) Open your PDF document in Adobe Acrobat. Choose File > Properties. 2) The Document Properties dialog box will open. File Size can be found on the Description tab in the Advanced section.

How many pixels is a PDF page?

By default, a chart is rendered as 500 pixels wide by 400 high. If you set a chart to have a specific width and height, like 5 inches wide by 2 inches high, it will be rendered in PDF as 480 pixels wide and 192 pixels high, and in HTML it would also be displayed at that pixel size.

What type of data is a PDF?

Portable Document Format (PDF), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.

What is Procset in PDF?

Class: PDF::Writer::Object::Procset These procedure sets are used only when the content stream is printed to a PostScript output device; the names identify PostScript procedure sets that must be sent to the device to interpret the PDF operators in the content stream.

What is xref table in PDF?

The PDF Cross Reference Table (xref) is the third major section of a PDF File. Please refer to the PDF Basic File Layout. The xref is the index by which all of the indirect objects, in the PDF file, are located. A single PDF file can contain multiple xref tables if the file has been incrementally saved or linearized.

What are different types of PDF?

On this page

  • XML Forms Architecture PDF(XFA PDF)
  • Static PDF.
  • Dynamic Forms.
  • PDF File (Traditional PDF)
  • Acroforms.
  • PDF/A (PDFs for Archive)
  • Viewing a PDF/A file.

What is the PDF specification?

The PDF specification also provides for encryption and digital signatures, file attachments, and metadata to enable workflows requiring these features. Adobe Systems made the PDF specification available free of charge in 1993.

What are the features of a PDF?

In later PDF revisions, a PDF document can also support links (inside document or web page), forms, JavaScript (initially available as a plugin for Acrobat 3.0), or any other types of embedded contents that can be handled using plug-ins. PDF combines three technologies:

What are the display settings of a PDF document?

PDF documents can also contain display settings, including the page display layout and zoom level in a Viewer Preferences object. Adobe Reader uses these settings to override the user’s default settings when opening the document. The free Adobe Reader cannot remove these settings.

What is the new structure of the PDF document?

The new structure of the PDF document can be seen in the picture below: We can see that the PDF document still contains the original header, body, cross-reference table and the trailer. Additionally, there are also other body, cross-reference and trailer sections that were added to the PDF document.