PDFBookHelper

A utility that helps to prepare print-ready book pdf. Currently support non-encrypted PDF ONLY.

• Merge two pages into one page for print in bookbinding order.
• Chop pages with mediaBox/chopBox/trimBox/BleedBox/ArtBox, or customized area according to your need.
• Split page into two half pages.
• Show different kinds of boxes.

NPM

npm install -g pdfbookhelper

Clone and Build

git clone https://github.com/studenttwok/pdfbookhelper
cd pdfbookhelper
npm run test
npm run build
npm run dev

CLI

You can use this helper in CLI

npx pdfbookhelper

For arguments please refer to the help. Here are some examples:

npx pdfbookhelper info input.pdf
npx pdfbookhelper merge input.pdf output.pdf
npx pdfbookhelper chop input.pdf output.pdf bleedBox
npx pdfbookhelper half input.pdf output.pdf -rf -rl
npx pdfbookhelper rearrange input.pdf output.pdf 1-3 5,6,8 9
npx pdfbookhelper appeend input.pdf input2.pdf output.pdf
npx pdfbookhelper rotate input.pdf output.pdf 90

Code

Import the library by

const { getPagesBoxInfo, mergeForPrint, chopPages, halfTheWholePages, rearrangePages, appendPages, rotatePages } = require("pdfbookhelper");

• getPagesBoxInfo (async)
• mergeForPrint (asyn)
• chopPages (async)
• halfTheWholePages (async)
• rearrangePages (async)
• appendPages (async)
• rotatePages (async)

getPagesBoxInfo

await getPagesBoxInfo( 
	inputFilename 
)

inputFilename: string, filepath of the input PDF

Get boxes of pages

Return an array of boxes andd orientation angle (degree) of each page in page order.

Example:

[
	{
		mediaBox: {x:0, y:0, width:100, height:100 },
		chopBox: {x:0, y:0, width:100, height:100 },
		trimBox: {x:0, y:0, width:100, height:100 },
		bleedBox: {x:0, y:0, width:100, height:100 },
		artBox: {x:0, y:0, width:100, height:100 },
		angle: 0,
	},
	...
]

mergeForPrint

await mergeForPrint(  
	inputFilename,
	outputFileName,
	bleedingX = 0,
	bleedingY = 0
)

Create pdf with pages in book order

inputFilename: string, filepath of the input PDF

outputFileName: string, filepath of the output PDF

bleedingX: width offset of the page that you want to crop away during merge process

bleedingY: height offset of the page that you want to crop away during merge process

Example:

Input PDF Content: [A],[B],[C],[D],[E],[F],[G],[H]

Output PDF Contet: [HA],[BG],[FC],[DE]

chopPages

await chopPages(
	inputFilename, 
	outputFileName, 
	cropBox
)

Chop pages with specific area

inputFilename: string, filepath of the input PDF

outputFileName: string, filepath of the output PDF

cropBox: Either string of "artBox", "bleedBox", "cropBox", "trimBox", "mediaBox", or object with the following structure {x, y, width, height}

halfTheWholePages

await halfTheWholePages(
	inputFilename,
	outputFileName,
	retainFirst = false,
	retainLast = false
)

Split page into two half pages

inputFilename: string, filepath of the input PDF

outputFileName: string, filepath of the output PDF

retainFirst: boolean, whether we keep first page unchanged in the process

retainLast: boolean, whether we keep last page unchanged in the process

Example:

Input PDF Content: [AB],[CD],[EF],[GH]

Output PDF Contet: [A],[B],[C],[D],[E],[F],[G],[H]

rearrangePages

await rearrangePages(
	inputFilename,
	outputFileName,
	rearrangedSequence = [],
)

Rearrange pages of PDF

inputFilename: string, filepath of the input PDF

outputFileName: string, filepath of the output PDF

rearrangedSequence: array of integer, page Numbers(1-based), in desired order

Example:

Input PDF Content: [A],[B],[C],[D],[E],[F],[G],[H]

Input rearrangedSequence: [1,3,3,4,2]

Output PDF Contet: [A],[C],[C],[D],[B]

appendPages

await appendPages(
	inputFilename,
	inputFilename2,
	outputFileName,
	toHead = false,
)

Merge two input pdf files and save as a new file

inputFilename: string, filepath of the input PDF

inputFilename2: string, filepath of another input PDF

outputFileName: string, filepath of the output PDF

toHead: boolean, whether the content of inputFilename2 should be insert into head

Example:

Input PDF Content: [A],[B],[C],[D]

Input PDF Content2: [E],[F],[G],[H]

Input toHead : true

Output PDF Contet: [E],[F],[G],[H],[A],[B],[C],[D]

rotatePages

await rotatePages(
	inputFilename,
	outputFileName,
	degree,
	pageSequence = [],
)

Rotate specified pages in 90/180/270 degrees clockwise

inputFilename: string, filepath of the input PDF

outputFileName: string, filepath of the output PDF

degree: integer, degree of clockwise rotation, either 90, 180, 270.

pageSequence: array of integer, page Numbers(1-based) of which want the rotation applied on. If the array is empty, rotate all pages.

Example:

Input PDF Orientation: [90], [0], [90], [90]

Input degree: 180

Input pageSequence: [2]

Output PDF Orientation: [90] , [180], [90], [90]

Dependencies

• PDF-LIB (https://pdf-lib.js.org/)
• Commander.js (https://github.com/tj/commander.js)

Dev Dependencies

• jest (https://jestjs.io/)
• rollup (https://rollupjs.org/)
• rollup-plugin-terser (https://rollupjs.org/)

License

MIT

Issues

Please report. If you would like to contribute, PR is welcome.