How to create a PDF from a list of images with pdfkit
Posted on June 13, 2024
If you need to create a PDF multi-page document from a list of images, here the snippet of code using the library PDFKit.
This is the Node.js script:
const PDFDocument = require('pdfkit')
function createPDFWithImages(imageBuffers, size) {
return new Promise((resolve, reject) => {
const doc = new PDFDocument({ size })
let buffers = []
doc.on('data', buffers.push.bind(buffers))
doc.on('end', () => {
const pdfData = Buffer.concat(buffers)
resolve(pdfData)
});
doc.on('error', reject)
imageBuffers.forEach((imageBuffer, index) => {
if (index > 0) doc.addPage({ size })
doc.image(imageBuffer, 0, 0, {
width: size[0],
height: size[1]
})
})
doc.end()
})
}
And here how to use that function:
const imageBuffers = [... buffers of image]
const PDFBuffer = await createPDFWithImages(imageBuffers, [500,300])
That's it. You then need to use the fs package to save the buffer to disk.