The following library seems to be capable of editing the PDF too. Your screenshot shows the Acrobat Pro tools so the answer is Yes though not all PDF editors can do that. To add or replace JavaScript at the document level that runs when the file is opened use the doc Object addScript method.
How do I edit a document that is exported as PDF?
If you are looking for online editing of documents that are ultimately exported as PDF, then a way forward is to keep an html version of the document source and have the user edit this with TinyMCE, CKEditor, etc, then use one of the server-side tools to take the saved source HTML and render out to PDF.
How do I edit a PDF in a GUI?
And here we are. Back to the question - to edit a PDF in any meaningful GUI way, you would need to unpack the PDF and render the components (images, formatted text, pages) to the display device; then allow folks to mess with the layout; then re-pack the PDF.
What is JavaScript PDF Lib?
pdf-lib was created to address the JavaScript ecosystem's lack of robust support for PDF manipulation (especially for PDF modification ). Supporting modification (editing) of existing documents. Working in all JavaScript environments - not just in Node or the Browser. There are other good open source JavaScript PDF libraries available.
Table of Contents
FeaturesMotivationUsage ExamplesCreate DocumentModify DocumentCreate FormFill FormFlatten FormCopy PagesEmbed PNG and JPEG ImagesEmbed PDF PagesEmbed Font and Measure TextAdd AttachmentsSet Document MetadataRead Document MetadataSet Viewer PreferencesRead Viewer PreferencesDraw SVG PathsDeno UsageComplete Examples
github.com
Features
•Create new PDFs
•Modify existing PDFs
•Create forms
•Fill forms
•Flatten forms
•Add Pages
github.com
Motivation
pdf-lib was created to address the JavaScript ecosystem's lack of robust support for PDF manipulation (especially for PDF modification).
Two of pdf-lib's distinguishing features are:
1.Supporting modification (editing) of existing documents.
2.Working in all JavaScript environments - not just in Node or the Browser.
github.com
Usage Examples
Create Document
This example produces this PDF. Try the JSFiddle demo
Modify Document
This example produces this PDF (when this PDF is used for the existingPdfBytes variable). Try the JSFiddle demo
Create Form
This example produces this PDF. Try the JSFiddle demo
github.com
Deno Usage
Creating a Document with Deno
Below is the create document example modified for Deno: If you save this script as create-document.ts, you can execute it using Deno with the following command: The resulting out.pdf file will look like this PDF.
Embedding a Font with Deno
Here's a slightly more complicated example demonstrating how to embed a font and measure text in Deno: If you save this script as custom-font.ts, you can execute it with the following command: The resulting out.pdf file will look like this PDF.
github.com
Complete Examples
The usage examples provide code that is brief and to the point, demonstrating the different features of pdf-lib. You can find complete working examples in the apps/ directory. These apps are used to do manual testing of pdf-lib before every release (in addition to the automated tests).
There are currently four apps:
•node - contains tests for pdf-lib in Node environments. These tests are a handy reference when trying to save/load PDFs, fonts, or images with pdf-lib from the filesystem. They also allow you to quickly open your PDFs in different viewers (Acrobat, Preview, Foxit, Chrome, Firefox, etc
Installation
NPM Module
To install the latest stable version: This assumes you're using npm or yarn as your package manager.
UMD Module
You can also download pdf-lib as a UMD module from unpkg or jsDelivr. The UMD builds have been compiled to ES5, so they should work in any modern browser. UMD builds are useful if you aren't using a package manager or module bundler. For example, you can use them directly in the
github.com
Fontkit Installation
pdf-lib relies upon a sister module to support embedding custom fonts: @pdf-lib/fontkit. You must add the @pdf-lib/fontkit module to your project and register it using pdfDoc.registerFontkit(
Documentation
API documentation is available on the project site at https://pdf-lib.js.org/docs/api/.
The repo for the project site (and generated documentation files) is located here: https://github.com/Hopding/pdf-lib-docs.
github.com
Fonts and Unicode
When working with PDFs, you will frequently come across the terms "character encoding" and "font". If you have experience in web development, you may wonder why these are so prevalent. Aren't they just annoying details that you shouldn't need to worry about? Shouldn't PDF libraries and readers be able to handle all of this for you like web browsers can? Unfortunately, this is not the case. The nature of the PDF file format makes it very difficult to avoid thinking about character encodings and fonts when working with PDFs.
pdf-lib does its best to simplify things for you. But it can't perform magic. This means you should be aware of the following:
•There are 14 standard fonts defined in the PDF specification. They are as follows: Times Roman (normal, bold, and italic), Helvetica (normal, bold, and italic), Courier (normal, bold, and italic), ZapfDingbats (normal), and Symbol (normal). These 14 fonts are guaranteed to be available in PDF readers. As such, you do not need to embed any font data if you wish to use one of these fonts. You can use a standard font like so:
•The standard fonts do not support all characters available in Unicode. The Times Roman, Helvetica, and Courier fonts use WinAnsi encoding (aka Windows-1252). The WinAnsi character set only supports 218 characters in the Latin alphabet. For this reason, many users will find the standard fonts insufficient for their use case. This is unfortunate, but there's nothing that PDF libraries can do to change this. This is a result of the PDF specification and its age. Note that the ZapfDingbats and Symbol fonts use their own specialized encodings that support 203 and 194 characters, respectively. However, the characters they support are not useful for most use cases. See here for an example of all 14 standard fonts.
•You can use characters outside the Latin alphabet by embedding your own fonts. Embedding your own font requires to you load the font data (from a file or via a network request, for example) and pass it to the embedFont method. When you embed your own font, you can use any Unicode characters that it supports. This capability frees you from the limitations imposed by the standard fonts. Most PDF files use embedded fonts. You can embed and use a custom font like so (see also):
Note that encoding errors will be thrown if you try to use a character with a font that does not support it. For example, Ω is not in the WinAnsi character set. So trying to draw it on a page with the standard Helvetica font will throw the following error:
github.com
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