The National Archives
Search our website
  • Search our website
  • Search our records
Image of software box and CD PRONOM
Welcome (PRONOM  home page) About PRONOM Add an entry
Search Help - opens in a new window Information resources - opens in a new window

*Details: File format summary



Search by keyword Search by file format Search by PUID Search by software Search by vendor Search by lifecycles Search by Migration Pathway

Details for:

Save as... XML | CSV Printer friendly version
Go to:  Summary  |  Documentation  |  Signatures |  Compression  |  Character encoding  |  Rights  |  Reference files   Properties  


External signatures File extension: pdf
Internal signatures
Name PDF/A-3B
Description BOF: %PDF1.(0-7) VAR: Identifies the byte sequence which equals - xmlns:pdfaid=" which is the PDF/A identification namespace within the PDF/A meta-data, followed by <pdfaid:part>3<pdfaid:part> and <pdfaid:conformance>B<pdfaid:conformance>, which are the two mandatory elements and values for PDF/A. See ISO 19005-3:2012 for further information.
Byte sequences
Position type Absolute from BOF
Offset 0
Byte order  
Value 255044462D312E[30:37]
Position type Variable
Byte order  
Value 786D6C6E733A7064666169643D(22|27)687474703A2F2F7777772E6169696D2E6F72672F706466612F6E732F6964*7064666169643A70617274(3D22|3D27|3E)33(22|27|3C2F7064666169643A706172743E){0-11}7064666169643A636F6E666F726D616E6365(3E|3D22|3D27)42(22|27|3C2F7064666169643A636F6E666F726D616E63653E)
Top of page Top of page
The National Archives Newsletter Icon

Send me The National Archives’ newsletter

A monthly round-up of news, blogs, offers and events.