diff --git a/core-java/src/main/java/com/baeldung/hexToAscii/HexToAscii.java b/core-java/src/main/java/com/baeldung/hexToAscii/HexToAscii.java
new file mode 100644
index 0000000000..2a3c4b109e
--- /dev/null
+++ b/core-java/src/main/java/com/baeldung/hexToAscii/HexToAscii.java
@@ -0,0 +1,46 @@
+package com.baeldung.hexToAscii;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+public class HexToAscii {
+
+    @Test
+    public static void whenHexToAscii() {
+        String asciiString = "http://www.baeldung.com/jackson-serialize-dates";
+        String hexEquivalent = "687474703a2f2f7777772e6261656c64756e672e636f6d2f6a61636b736f6e2d73657269616c697a652d6461746573";
+
+        assertEquals(asciiString, hexToAscii(hexEquivalent));
+    }
+
+    @Test
+    public static void whenAsciiToHex() {
+        String asciiString = "http://www.baeldung.com/jackson-serialize-dates";
+        String hexEquivalent = "687474703a2f2f7777772e6261656c64756e672e636f6d2f6a61636b736f6e2d73657269616c697a652d6461746573";
+
+        assertEquals(hexEquivalent, asciiToHex(asciiString));
+    }
+
+    //
+
+    private static String asciiToHex(String asciiStr) {
+        char[] chars = asciiStr.toCharArray();
+        StringBuilder hex = new StringBuilder();
+        for (char ch : chars) {
+            hex.append(Integer.toHexString((int) ch));
+        }
+
+        return hex.toString();
+    }
+
+    private static String hexToAscii(String hexStr) {
+        StringBuilder output = new StringBuilder("");
+        for (int i = 0; i < hexStr.length(); i += 2) {
+            String str = hexStr.substring(i, i + 2);
+            output.append((char) Integer.parseInt(str, 16));
+        }
+        return output.toString();
+    }
+
+}
diff --git a/pdf/pom.xml b/pdf/pom.xml
index 311265880d..c6404c6b30 100644
--- a/pdf/pom.xml
+++ b/pdf/pom.xml
@@ -40,9 +40,9 @@
 			<version>5.5.10</version>
 		</dependency>
 		<dependency>
-			<groupId>org.apache.poi</groupId>
-			<artifactId>poi</artifactId>
-			<version>3.15</version>
+			<groupId>com.itextpdf.tool</groupId>
+			<artifactId>xmlworker</artifactId>
+			<version>5.5.10</version>
 		</dependency>
 		<dependency>
 			<groupId>org.apache.poi</groupId>
diff --git a/pdf/src/main/java/com/baeldung/pdf/PDF2HTMLExample.java b/pdf/src/main/java/com/baeldung/pdf/PDF2HTMLExample.java
index 0d38208bab..1fdf07a05f 100644
--- a/pdf/src/main/java/com/baeldung/pdf/PDF2HTMLExample.java
+++ b/pdf/src/main/java/com/baeldung/pdf/PDF2HTMLExample.java
@@ -1,6 +1,8 @@
 package com.baeldung.pdf;
 
 import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.io.Writer;
@@ -10,14 +12,21 @@ import javax.xml.parsers.ParserConfigurationException;
 import org.apache.pdfbox.pdmodel.PDDocument;
 import org.fit.pdfdom.PDFDomTree;
 
+import com.itextpdf.text.Document;
+import com.itextpdf.text.DocumentException;
+import com.itextpdf.text.pdf.PdfWriter;
+import com.itextpdf.tool.xml.XMLWorkerHelper;
+
 public class PDF2HTMLExample {
 
-	private static final String FILENAME = "src/main/resources/pdf.pdf";
+	private static final String PDF = "src/main/resources/pdf.pdf";
+	private static final String HTML = "src/main/resources/html.html";
 
 	public static void main(String[] args) {
 		try {
-			generateHTMLFromPDF(FILENAME);
-		} catch (IOException | ParserConfigurationException e) {
+			generateHTMLFromPDF(PDF);
+			generatePDFFromHTML(HTML);
+		} catch (IOException | ParserConfigurationException | DocumentException e) {
 			e.printStackTrace();
 		}
 	}
@@ -32,4 +41,12 @@ public class PDF2HTMLExample {
 			pdf.close();
 		}
 	}
+
+	private static void generatePDFFromHTML(String filename) throws ParserConfigurationException, IOException, DocumentException {
+		Document document = new Document();
+		PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("src/output/html.pdf"));
+		document.open();
+		XMLWorkerHelper.getInstance().parseXHtml(writer, document, new FileInputStream(filename));
+		document.close();
+	}
 }
diff --git a/pdf/src/main/java/com/baeldung/pdf/PDF2ImageExample.java b/pdf/src/main/java/com/baeldung/pdf/PDF2ImageExample.java
index 00778d16c1..69f5d9731f 100644
--- a/pdf/src/main/java/com/baeldung/pdf/PDF2ImageExample.java
+++ b/pdf/src/main/java/com/baeldung/pdf/PDF2ImageExample.java
@@ -1,24 +1,36 @@
 package com.baeldung.pdf;
 
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.net.URL;
+
 import org.apache.pdfbox.pdmodel.PDDocument;
 import org.apache.pdfbox.rendering.ImageType;
 import org.apache.pdfbox.rendering.PDFRenderer;
 import org.apache.pdfbox.tools.imageio.ImageIOUtil;
 
-import java.awt.image.BufferedImage;
-import java.io.File;
-import java.io.IOException;
+import com.itextpdf.text.BadElementException;
+import com.itextpdf.text.Document;
+import com.itextpdf.text.DocumentException;
+import com.itextpdf.text.Image;
+import com.itextpdf.text.pdf.PdfWriter;
 
 public class PDF2ImageExample {
 
-	private static final String FILENAME = "src/main/resources/pdf.pdf";
-	
+	private static final String PDF = "src/main/resources/pdf.pdf";
+	private static final String JPG = "http://cdn2.baeldung.netdna-cdn.com/wp-content/uploads/2016/05/baeldung-rest-widget-main-1.2.0";
+	private static final String GIF = "https://media.giphy.com/media/l3V0x6kdXUW9M4ONq/giphy";
+
 	public static void main(String[] args) {
 		try {
-			generateImageFromPDF(FILENAME, "png");
-			generateImageFromPDF(FILENAME, "jpeg");
-			generateImageFromPDF(FILENAME, "gif");
-		} catch (IOException e) {
+			generateImageFromPDF(PDF, "png");
+			generateImageFromPDF(PDF, "jpeg");
+			generateImageFromPDF(PDF, "gif");
+			generatePDFFromImage(JPG, "jpg");
+			generatePDFFromImage(GIF, "gif");
+		} catch (IOException | DocumentException e) {
 			e.printStackTrace();
 		}
 	}
@@ -32,4 +44,19 @@ public class PDF2ImageExample {
 		}
 		document.close();
 	}
+
+	private static void generatePDFFromImage(String filename, String extension)
+			throws IOException, BadElementException, DocumentException {
+		Document document = new Document();
+		String input = filename + "." + extension;
+		String output = "src/output/" + extension + ".pdf";
+		FileOutputStream fos = new FileOutputStream(output);
+		PdfWriter writer = PdfWriter.getInstance(document, fos);
+		writer.open();
+		document.open();
+		document.add(Image.getInstance((new URL(input))));
+		document.close();
+		writer.close();
+	}
+
 }
diff --git a/pdf/src/main/java/com/baeldung/pdf/PDF2TextExample.java b/pdf/src/main/java/com/baeldung/pdf/PDF2TextExample.java
index c5880a4e91..7965152234 100644
--- a/pdf/src/main/java/com/baeldung/pdf/PDF2TextExample.java
+++ b/pdf/src/main/java/com/baeldung/pdf/PDF2TextExample.java
@@ -1,6 +1,9 @@
 package com.baeldung.pdf;
 
+import java.io.BufferedReader;
 import java.io.File;
+import java.io.FileOutputStream;
+import java.io.FileReader;
 import java.io.IOException;
 import java.io.PrintWriter;
 
@@ -10,14 +13,24 @@ import org.apache.pdfbox.pdfparser.PDFParser;
 import org.apache.pdfbox.pdmodel.PDDocument;
 import org.apache.pdfbox.text.PDFTextStripper;
 
+import com.itextpdf.text.Document;
+import com.itextpdf.text.DocumentException;
+import com.itextpdf.text.Element;
+import com.itextpdf.text.Font;
+import com.itextpdf.text.PageSize;
+import com.itextpdf.text.Paragraph;
+import com.itextpdf.text.pdf.PdfWriter;
+
 public class PDF2TextExample {
 
-	private static final String FILENAME = "src/main/resources/pdf.pdf";
+	private static final String PDF = "src/main/resources/pdf.pdf";
+	private static final String TXT = "src/main/resources/txt.txt";
 
 	public static void main(String[] args) {
 		try {
-			generateTxtFromPDF(FILENAME);
-		} catch (IOException e) {
+			generateTxtFromPDF(PDF);
+			generatePDFFromTxt(TXT);
+		} catch (IOException | DocumentException e) {
 			e.printStackTrace();
 		}
 	}
@@ -45,4 +58,27 @@ public class PDF2TextExample {
 		pw.close();
 	}
 
+	private static void generatePDFFromTxt(String filename) throws IOException, DocumentException {
+		Document pdfDoc = new Document(PageSize.A4);
+		PdfWriter.getInstance(pdfDoc, new FileOutputStream("src/output/txt.pdf"))
+				.setPdfVersion(PdfWriter.PDF_VERSION_1_7);
+		pdfDoc.open();
+		
+		Font myfont = new Font();
+		myfont.setStyle(Font.NORMAL);
+		myfont.setSize(11);
+		pdfDoc.add(new Paragraph("\n"));
+		
+		BufferedReader br = new BufferedReader(new FileReader(filename));
+		String strLine;
+		while ((strLine = br.readLine()) != null) {
+			Paragraph para = new Paragraph(strLine + "\n", myfont);
+			para.setAlignment(Element.ALIGN_JUSTIFIED);
+			pdfDoc.add(para);
+		}
+		
+		pdfDoc.close();
+		br.close();
+	}
+
 }
diff --git a/pdf/src/main/resources/html.html b/pdf/src/main/resources/html.html
new file mode 100644
index 0000000000..d3072c056c
--- /dev/null
+++ b/pdf/src/main/resources/html.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+<title>A very simple webpage</title>
+</head>
+
+<body>
+<h1>A very simple webpage. This is an "h1" level header.</h1>
+
+<h2>This is a level h2 header.</h2>
+
+<h6>This is a level h6 header.  Pretty small!</h6>
+
+<p>This is a standard paragraph.</p>
+
+<p align=center>Now I've aligned it in the center of the screen.</p>
+
+<p align=right>Now aligned to the right</p>
+
+<p><b>Bold text</b></p>
+
+<p><strong>Strongly emphasized text</strong>  Can you tell the difference vs. bold?</p>
+
+<p><i>Italics</i></p>
+
+<p><em>Emphasized text</em>  Just like Italics!</p>
+
+<h2>How about a nice ordered list!</h2>
+<ol>
+  <li>This little piggy went to market</li>
+  <li>This little piggy went to SB228 class</li>
+  <li>This little piggy went to an expensive restaurant in Downtown Palo Alto</li>
+  <li>This little piggy ate too much at Indian Buffet.</li>
+  <li>This little piggy got lost</li>
+</ol>
+
+<h2>Unordered list</h2>
+<ul>
+  <li>First element</li>
+  <li>Second element</li>
+  <li>Third element</li>
+</ul>
+
+
+<p>And finally, how about some</p><a href="http://www.google.com/">Links?</a>
+
+<p>Remember, you can view the HTMl code from this or any other page by using the "View Page Source" command of your browser.</p>
+
+</body>
+
+</html>
+
diff --git a/pdf/src/main/resources/txt.txt b/pdf/src/main/resources/txt.txt
new file mode 100644
index 0000000000..de0c36ae75
--- /dev/null
+++ b/pdf/src/main/resources/txt.txt
@@ -0,0 +1,3 @@
+Test
+Text
+			Test	TEST
\ No newline at end of file