You ask, the PDF Association answers
What is PDF/A, what does it have to offer, and how can I best use it?
Attribute Changer modifies file dates and timestamps as well as the read-only, system and hidden status flags. Features: Right-click add-on for Windows Explorer; Change standard Windows attributes (read-only, system, hidden, etc.) Modify date and time stamps (Created, Modified, Accessed) Modify photo date and time stamps (EXIF information). Click on Transform Node attribute editor and you will see the node attribute editor open up as follows. 9 You can use this editor to change or add in new attributes. We are going to size the nodes by age, colour them by department and shape them according to level. Close the attribute editor. When you view a PDF, you can get information about it, such as the title, the fonts used, and security settings. Some of this information is set by the person who created the document, and some is generated automatically. In Acrobat, you can change any information that can be set by the document creator, unless the file has been saved with security settings that prevent changes.
Answers to such questions are provided on this page. If you have a question that is not yet addressed here, let us know!
General
If I have PDF/A, do I no longer need paper copies?
The ability to replace paper with electronic documents is a primary goal of PDF/A. Digital documents should remain in electronic format, giving the user a wide range of additional features such as full-text search, digital signatures, and so on.
Up to now we've used 'normal' PDF for archiving digital documents. Why is PDF/A better?
PDF/A is an ISO-standardized subset of PDF that eliminates certain risks to the future reproducibility of the content.
Unlike normal PDF, PDF/A requires that everything necessary to precisely rendering the document is contained in the PDF/A file, including fonts, colour profiles, images and so on.
PDF/A forbids dynamic content to ensure that the user sees the exact same content both today and for years to come.
File Formats
How does PDF/A fare with respect to file corruption?
PDF/A is just another file-format, and provides no special protections against data corruption.
Can PDF/A files contain copyright information?
Yes. PDF/A allows users to save various metadata (for example the copyright) in the document using Extensible Metadata Platform (XMP) technology.
How are PDF/A and PDF/X related to each other?
The PDF/A and PDF/X standards are fundamentally compatible; i.e. a PDF file can generally conform to both PDF/A and PDF/X, but for maximum compatibility with modern PDF/X files, PDF/A-2 is highly recommended due to its support for transparency and layers.
Long-term archiving
Will future developments to the PDF/A standard make current PDF/A versions obsolete?
The ISO standard requires that future PDF viewing applications must be backward compatible, so that they are capable of correctly displaying older versions of PDF/A.
PDF/A Characteristics
How can you best make PDF/A files text searchable?
PDF/A files are generally searchable, unless the file was created from a scanned paper document or image. In the case of scanned documents, OCR can be used to create searchable text.
Can PDF/A files include links?
There's no problem with including links in a PDF/A file. It should be considered, however, that external links will likely become invalid over time.
Can audio and video be used in PDF/A files?
PDF/A prohibits audio and video objects in PDF/A files.
Are PDF/A files much larger than normal PDFs?
A PDF/A file might be slightly larger than the original PDF file it was created from (provided they don't use different image resolutions or compression methods). Fonts are embedded in a PDF/A file (which is often also the case in normal PDF files) and more information is stored in the metadata. Some color profiles could, in certain cases, lead to a much larger file size, but this is rare and is highly dependent on the particular case.
Can PDF/A be used with CAD?
PDF/A-3 files may include CAD files as embedded objects.
Is compression allowed in PDF/A?
Yes. ZIP file compression is permitted, and images can be compressed using JPEG compression. LZW compression, however, is forbidden.
Can PDF/A files be encrypted?
No. PDF/A prohibits the use of encryption on the file. For access-control purposes, it is necessary to control access to the locations in which the PDF/A files are stored.
Can bookmarks in a PDF file cause problems in PDF/A?
No. Bookmarks are permitted in PDF/A.
Can PDF/A documents be made 'accessible'?
Accessibility and PDF/A go hand-in-hand. PDF/A files may also conform to PDF/UA, the ISO standard for accessible PDF technology.
Can annotations and notes be used in PDF/A files?
Most forms of PDF annotations are permitted in PDF/A. There are certain restrictions; for example any annotations must be visible.
Viewing PDF/A Files
Do I have to purchase an application to display PDF/A files?
No. All PDF viewers are capable of displaying PDF/A files.
Are there any requirements for PDF/A viewing software?
Yes. The PDF/A specification makes certain requirements of viewers that claim support for the PDF/A specification.
Creating and Converting PDF/A
Can 'normal' PDF files be converted to PDF/A?
In general, PDF files can be converted to PDF/A. However, depending on the contents of the source PDF and PDF/A target selection, it's possible that some features cannot be transferred to a PDF/A file.
In very general terms, PDF/A-1 is adequate for many archival purposes, especially for scanned documents.
PDF/A-2, which is based on ISO 32000-1, is more flexible, and allows for richer graphics, including transparency and layers, and the embedding of other PDF/A files.
PDF/A-3 is similar to PDF/A-2, but also allows for embedding non-PDF files.
How can I tell if a font is protected by copyright and can't be copied into a PDF/A file?
Usually a program that creates PDF/A files will give a warning if a font file cannot be embedded. The problem is not very prevalent with standard western fonts, since most font developers allow their fonts to be embedded. However, some fonts (including many Japanese fonts) are copyrighted and cannot be embedded.
We currently have an archive of TIFF images. Can these files be converted to PDF/A with a reasonable effort?
There are many solutions available that are geared towards converting large volumes of files (from different formats) into PDF/A.
How can I create a PDF/A file?
In principle, any PDF creation software may also create PDF/A files. In practice, the following scenarios are the most typical:
- Export a document to PDF/A
- Print to PDF/A on a desktop computer
- Print to PDF/A using a print stream on a server
- Scan to PDF/A (paper to PDF/A)
- Convert existing image files to PDF/A
- Convert existing PDF files to PDF/A
- Create PDF/A on-the-fly from data or a database
Check out the many PDF/A solutions developed by PDF Association members to find what's right for you.
![Attribute Attribute](https://www.filehorsez.com/wp-content/uploads/2020/07/Movavi-PDF-Editor-1.5-free-download-full-version.jpg)
PDF/A Validation
How can I find out if a font is embedded?
When a PDF/A file is created, the creation software ensures that fonts are embedded. Without embedded fonts you don't have a valid PDF/A file. Many desktop PDF creation and editing tools allow you to determine whether your fonts are embedded or not.
Are there programs that check and confirm the validity of a PDF/A file?
There are many such tools, from open source (including the industry-supported veraPDF validator) to commercial solutions.
Signatures
Can PDF/A files contain an electronic signature?
Yes.
The
Link
feature brings support for link editing to the rich-text editor. It allows for inserting hyperlinks into the edited content and offers the UI to create and edit them.After you enable the optional autolink plugin, typed or pasted URL and e-mail addresses will be automatically turned into working links as you type.
# Demo
You can edit existing links by clicking them and using the balloon. Use the Link toolbar button or press Ctrl/⌘+K to create a new link.
Valletta
The capital city of Malta is the top destination this summer. It’s home to a cutting-edge contemporary architecture, baroque masterpieces, delicious local cuisine and at least 8 months of sun.
It’s also a top destination for filmmakers, so you can take a tour through locations familiar to you from Game of Thrones, Gladiator, Troy and many more.
# Typing around links
2do 2 0 1 download free. CKEditor 5 allows for typing both at inner and outer boundaries of links to make the editing easier for the users.
To type inside a link, move the caret to its (start or end) boundary. As long as the link remains highlighted (by default: blue), typing and applying formatting will be done within its boundaries:
To type before or after a link, move the caret to its boundary, then press the Arrow key (→ or ←) once. The link is no longer highlighted and whatever text you type or formatting you apply will not be enclosed by the link:
# Custom link attributes (decorators)
By default, all links created in the editor have the
href='..'
attribute in the editor data. If you want your links to have additional link attributes, link decorators provide an easy way to configure and manage them.There are two types of link decorators you can use:
- Automatic – They match links against pre–defined rules and manage their attributes based on the results.
- Manual – They allow users to control link attributes individually using the editor UI.
Link decorators are disabled by default and it takes a proper configuration to enable them in your rich-text editor.
# Demo
In the editor below, all external links get the
target='_blank'
and rel='noopener noreferrer'
attributes (automatic decorator). Click a link and edit it to see that it is possible to control the download
attribute of specific links using the switch button in the editing balloon (manual decorator). Take a look at the editor data below (updated live) to see the additional link attributes.The following code was used to run the editor. Learn more about the configuration of the feature.
# Configuration
Decorators are configured through definitions provided in the
config.link.decorators
configuration option.Each decorator definition must have its own unique name. In case of manual decorators, that name also represents the decorator in the document model.
Link decorators work independently of one another and no conflict resolution mechanism exists. For example, configuring the
target
attribute using both an automatic and a manual decorator at the same time could end up with quirky results. The same applies if multiple manual or automatic decorators were defined for the same attribute.File Attribute Editor
# Adding target
and rel
attributes to external links
A very common use case for (automatic) link decorators is adding
target='_blank'
and rel='noopener noreferrer'
attributes to all external links in the document. A dedicated config.link.addTargetToExternalLinks
configuration has been created for that purpose. When this option is set to true
, all links starting with http://
, https://
or //
are “decorated” with target
and rel
attributes.Internally, this configuration corresponds to an automatic decorator with the following definition:
If you want to leave the decision whether a link should open in a new tab to the users, do not use the
config.link.addTargetToExternalLinks
configuration but define a new manual decorator with the following definition instead:# Adding default link protocol to external links
A default link protocol can be useful when the user forgets to type the full URL address to an external source or website. Sometimes copying the text, like for example
ckeditor.com
, and converting it to a link may cause some issues. As a result, the created link will direct you to yourdomain.com/ckeditor.com
because of the missing protocol. This makes the link relative to the site where it appears.After you enable the
config.link.defaultProtocol
configuration option, the link feature will be able to handle this issue for you. By default it does not fix the passed link value, but when you set config.link.defaultProtocol
to, for example, http://
, the plugin will add the given protocol to every link that may need it (like ckeditor.com
, example.com
, etc. where [protocol://]example.com
is missing).See a basic configuration example:
With the
config.link.defaultProtocol
option enabled, you are still able to link things locally using #
or /
. The protocol will not be added to these links.When enabled, this feature also provides the email address auto-detection feature. When you submit
[email protected]
in your content, the plugin will automatically change it to mailto:[email protected]
.# Adding attributes to links based on pre–defined rules (automatic decorators)
Automatic link decorators match all links in the editor content against a function which decides whether the link should receive some set of attributes, considering the URL (
href
) of the link. These decorators work silently and are being applied during the data downcast only.For instance, to create an automatic decorator that adds the
download='file.pdf'
attribute to all links ending with the '.pdf'
extension, you should add the following definition to config.link.decorators
:If you want the
target
and rel
attributes to be added to all external links in your content, we prepared a dedicated configuration exactly for that purpose so you do not have to define the automatic decorator by yourself.# Adding attributes to links using the UI (manual decorators)
Manual link decorators are represented in the link editing balloon as switch buttons that the users can use to control the presence of attributes of a particular link (check out the demo to learn more). Each manual decorator definition contains a human–readable label displayed next to the switch button in the link editing balloon. Make sure it is compact and precise for the convenience of the users.
To configure a “Downloadable” switch button in the link editing balloon that adds the
download='file'
attribute to the link when turned on, add the following definition to config.link.decorators
:# Autolink feature
You can enable automatic linking of URLs typed or pasted into the editor. The
AutoLink
feature will automatically turn URLs or e-mail addresses into real, working links.To use the autolink function simply press Space, Enter or Shift+Enter after a link.
Autolink action can always be reverted by the undo feature (Ctrl/⌘+Z).
![Pdf Attribute Editor 1 1 Pdf Attribute Editor 1 1](https://www.researchgate.net/profile/Silvia_Miksch/publication/216470514/figure/fig1/AS:339867310542858@1458042089889/Proposed-example-for-the-selection-a-and-inserting-page-b-without-Ajax_Q320.jpg)
Press Space after a link to see the magic of autolinking: https://ckeditor.com/
This feature also works with e-mail addresses: [email protected]
You can use Enter or Shift+Enter to achieve the same result: https://ckeditor.com/
Unlike the base link feature, the autolink plugin is not available in any of the builds. Refer to the Installation section to learn how to enable it.
# Installation
This base link feature is enabled by default in all builds. The installation instructions are for developers interested in building their own, custom rich text editor.
The autolink feature is not available in any of the builds and needs to be installed first. Read more about installing plugins.
To add this feature to your editor, install the
@ckeditor/ckeditor5-link
package:Then add the
Link
and AutoLink
plugins to your plugin list:# Common API
The
Link
plugin registers the UI button component ('link'
) and the following commands:- The
'link'
command implemented byLinkCommand
. - The
'unlink'
command implemented byUnlinkCommand
.
The commands can be executed using the
editor.execute()
method:The package provides a plugin for linking images. See the Linking images section in the feature guide.
Links are represented in the model using the
linkHref
attribute. Manual link decorators are represented in the model using text attributes corresponding to their names, as configured in config.link.decorators
.List Of Attributes Pdf
We recommend using the official CKEditor 5 inspector for development and debugging. It will give you tons of useful information about the state of the editor such as internal data structures, selection, commands, and many more.
# Contribute
Pdf Attribute Editor 1 1 Download
The source code of the feature is available on GitHub in https://github.com/ckeditor/ckeditor5/tree/master/packages/ckeditor5-link.