Add Side Note to a Page’s Margin

Add a sidenote to a page’s left or right margin using the .PageFinalize function while creating the PDF.

The .pageFinalize function is called on each PDF page in the final stage of creation and appends a paragraph at 90 degrees with custom text.

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 the examples repository. It contains the Go code we will be using for this guide.

git clone

Change into the repository directory and navigate to the pages folder.

cd unipdf-examples/pages

Configure environment variables

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





How it works

Lines 9-17 import the UniPDF packages and other required dependencies.

Lines 19-26 authenticate your request with your UNIDOC_LICENSE_API_KEY with the init function.

The main function in lines 28-102 creates a new PDF, appending a sidenote to each page margin. The created PDF is saved to the output path, page_side_notes.pdf.

Run the code

Run this command to add a sidenote to each page’s margin. This will also get all the required dependencies to run the program.

go run pdf_page_side_note.go

Sample output

There is text on each page’s left or right margin in the PDF. In this example, you can see the text: Page 1/2 at the page’s right margin. PDF with a side note at the right margin

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