There are several ways to include a PDF file in your HTML document: Using the <embed> and <object> tags, which are considered to be old-fashioned ways, because they are deprecated now. And Using the <a> or the <iframe> tag.
The easiest way to put PDF in an HTML document is using the <a> tag with its href attribute. You need to add the URL or the reference link of your PDF file to the element. Your code will look like the following.
<!DOCTYPE html>
<html>
<head>
<title>Title of Page</title>
</head>
<body>
<h1>PDF</h1>
<a href="file.pdf">Open a PDF file</a>
</body>
</html>
Example of adding a PDF file to the HTML by using the <iframe> tag:
<!DOCTYPE html>
<html>
<head>
<title>Title of Page</title>
</head>
<body>
<h1>PDF with iframe</h1>
<iframe src="file.pdf" width="100%" height="200px">
</iframe>
</body>
</html>