Add Images to Pdf

This guide explains how to add multiple images to a pdf document one image per page.

Before you begin #

You should get your API key from your UniCloud account.

If this is your first time using UniPDF SDK, follow this guide to set up a local development environment.

Project setup #

Clone the project repository #

In your terminal, clone examples repository. It contains the Go code we will be using for this guide.

git clone https://github.com/unidoc/unipdf-examples.git

Navigate to the image folder in the unipdf-examples directory.

cd unipdf-examples/image

Configure environment variables #

Replace the UNIDOC_LICENSE_API_KEY with your API credentials from your UniCloud account.

Linux/Mac #

export UNIDOC_LICENSE_API_KEY=PUT_YOUR_API_KEY_HERE

Windows #

set UNIDOC_LICENSE_API_KEY=PUT_YOUR_API_KEY_HERE

How it works #

In lines 9-25 the import section and the init function imports the necessary libraries and authenticates the request.using UNIDOC_LICENSE_API_KEY respectively.

The main function in lines 27-43 reads the environment variables and calls imagesToPdf to add the list of images to the pdf pages.

The imagesToPdf function defines in lines 46-70 adds the images to the pdf file provided in the parameter. The loop in lines 49-66 iterates through each image, creates a new page, and draws the image on the page. Finally the document is written to output file using c.WriteToFile(outputPath) in line 68.

Run the code #

go run pdf_images_to_pdf.go output.pdf img1.jpg img2.jpg img3.png ...