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C# Convert String to Bubble (How it Works for Developers)

Name: IronPDF
Brand: Iron Software
Availability: InStock
Rating: 4.87 (307 reviews)

Chipego Kalinda

April 3, 2025

Introduction

Speech bubbles are a great way to highlight text, annotate documents, or create comic-style effects in PDFs. Whether you're adding comments to a report, generating instructional guides, or creating interactive documents, speech bubbles can enhance the readability and visual appeal of your PDFs.

In this article, we'll explore how to convert string variables into a speech bubble in C# using IronPDF. IronPDF is a powerful .NET library that enables easy conversion of HTML and CSS into PDFs, making it ideal for rendering styled speech bubbles dynamically from any given C# string. Let’s dive in!

IronPDF: A Powerful .NET PDF Library

C# Convert String to Bubble (How it Works for Developers): Figure 1 Add from PixabayUpload

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So why IronPDF? IronPDF is a powerful C# library designed to make working with PDF files programmatically a breeze. With it, you can easily generate PDF documents from HTML, images, DOCX files, and more. Or, perhaps you are looking for a tool that can handle PDF security efficiently and effectively or for editing existing PDF documents. Whatever the task, IronPDF has you covered, serving as an all-encompassing library that has a solution to just about any PDF-related task without the need for third-party libraries.

Setting Up the Project

Installing IronPDF

To begin, install IronPDF via NuGet. Open the Package Manager Console in Visual Studio and run:

Install-Package IronPdf

Install-Package IronPdf

'INSTANT VB TODO TASK: The following line uses invalid syntax:
'Install-Package IronPdf

Alternatively, you can install it via the NuGet Package Manager in Visual Studio by searching for IronPDF, and then clicking "Install".

C# Convert String to Bubble (How it Works for Developers): Figure 2 Add from PixabayUpload

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Once installed, ensure you have the following namespace included in your C# file:

using IronPdf;

using IronPdf;

Imports IronPdf

Understanding Speech Bubbles in PDFs

Speech bubbles are typically created using HTML and CSS. They consist of a text container with rounded edges and a small tail pointing towards the speaker. Using IronPDF, we can generate these speech bubbles as HTML elements and render them inside a PDF.

Working with Data Types for Speech Bubbles

Parsing String Values into Numeric Types

Sometimes, we may need to convert user input into a double value for setting dimensions of the speech bubble dynamically. We can use the parse method to achieve this:

string widthInput = "150.5";
double bubbleWidth = double.Parse(widthInput);

string widthInput = "150.5";
double bubbleWidth = double.Parse(widthInput);

Dim widthInput As String = "150.5"
Dim bubbleWidth As Double = Double.Parse(widthInput)

This allows dynamic resizing of the bubble based on user input.

Using Boolean Values for Display Options

A boolean value can be used to toggle whether a speech bubble should be visible:

bool showBubble = true;
if (showBubble)
{
    Console.WriteLine("Speech bubble is visible");
}

bool showBubble = true;
if (showBubble)
{
    Console.WriteLine("Speech bubble is visible");
}

Dim showBubble As Boolean = True
If showBubble Then
	Console.WriteLine("Speech bubble is visible")
End If

Convert Strings to Speech Bubbles with IronPDF

Creating an HTML Template for the Bubble

Since IronPDF supports HTML-to-PDF conversion, we can create a simple speech bubble using HTML and CSS. To convert string variables into PDF documents, you need to make sure you first create a new ChromePdfRenderer instance.

using IronPdf;
class Program
{
    static void Main()
    {
        ChromePdfRenderer renderer = new ChromePdfRenderer();
        string htmlContent = "" +
    "<div class='bubble'>Hello, this is a speech bubble!</div>" +
    "<style>" +
    ".bubble { display: inline-block; background: #f0f0f0; border-radius: 10px; padding: 10px 15px; position: relative; font-family: Arial, sans-serif; }" +
    ".bubble::after { content: ''; position: absolute; bottom: -10px; left: 20px; border-width: 10px; border-style: solid; border-color: #f0f0f0 transparent transparent transparent; }" +
    "</style>";
        PdfDocument pdf = renderer.RenderHtmlAsPdf(htmlContent);
        pdf.SaveAs("speechBubble.pdf");
    }
}

using IronPdf;
class Program
{
    static void Main()
    {
        ChromePdfRenderer renderer = new ChromePdfRenderer();
        string htmlContent = "" +
    "<div class='bubble'>Hello, this is a speech bubble!</div>" +
    "<style>" +
    ".bubble { display: inline-block; background: #f0f0f0; border-radius: 10px; padding: 10px 15px; position: relative; font-family: Arial, sans-serif; }" +
    ".bubble::after { content: ''; position: absolute; bottom: -10px; left: 20px; border-width: 10px; border-style: solid; border-color: #f0f0f0 transparent transparent transparent; }" +
    "</style>";
        PdfDocument pdf = renderer.RenderHtmlAsPdf(htmlContent);
        pdf.SaveAs("speechBubble.pdf");
    }
}

Imports IronPdf
Friend Class Program
	Shared Sub Main()
		Dim renderer As New ChromePdfRenderer()
		Dim htmlContent As String = "" & "<div class='bubble'>Hello, this is a speech bubble!</div>" & "<style>" & ".bubble { display: inline-block; background: #f0f0f0; border-radius: 10px; padding: 10px 15px; position: relative; font-family: Arial, sans-serif; }" & ".bubble::after { content: ''; position: absolute; bottom: -10px; left: 20px; border-width: 10px; border-style: solid; border-color: #f0f0f0 transparent transparent transparent; }" & "</style>"
		Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf(htmlContent)
		pdf.SaveAs("speechBubble.pdf")
	End Sub
End Class

PDF Output

C# Convert String to Bubble (How it Works for Developers): Figure 3 - PDF Output of C# String to Speech Bubble Add from PixabayUpload

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As you can see, we have created a string variable that contains the HTML and CSS content that will be used to render a speech bubble in our PDF document. Then, using the RenderHtmlAsPdf method from the ChromePdfRenderer class, we render this string into a PDF document, before saving it.

By following these steps, you will have generated a new PDF document containing the text "Hello, this is a speech bubble!", and have mastered the basics of generating PDFs from a simple string.

Customizing the Speech Bubble

What if you wanted to do something more than simply adding a basic speech bubble to your PDF. Let's take a look at how you can customize a speech bubble using CSS. You can modify the color, size, and position of the bubble by tweaking the CSS. Here’s an example where we change the background color and text size:

.bubble {
  background: #ffcc00;
  color: #333;
  font-size: 16px;
}

.bubble {
  background: #ffcc00;
  color: #333;
  font-size: 16px;
}

IRON VB CONVERTER ERROR developers@ironsoftware.com

f you need dynamic text, you can replace the static text with a C# variable, the final code looking something like this:

using IronPdf;
class Program
{
    static void Main()
    {
        ChromePdfRenderer renderer = new ChromePdfRenderer();
        string userInput = "This is a custom speech bubble!";
        string dynamicHtml = $"<div class='bubble'>{userInput}</div>" + "<style>" + ".bubble {background: #ffcc00; color: #333; font-size: 16px; }" + "</style>";
        PdfDocument pdf = renderer.RenderHtmlAsPdf(dynamicHtml);
        pdf.SaveAs("speechBubble.pdf");
    }
}

using IronPdf;
class Program
{
    static void Main()
    {
        ChromePdfRenderer renderer = new ChromePdfRenderer();
        string userInput = "This is a custom speech bubble!";
        string dynamicHtml = $"<div class='bubble'>{userInput}</div>" + "<style>" + ".bubble {background: #ffcc00; color: #333; font-size: 16px; }" + "</style>";
        PdfDocument pdf = renderer.RenderHtmlAsPdf(dynamicHtml);
        pdf.SaveAs("speechBubble.pdf");
    }
}

Imports IronPdf
Friend Class Program
	Shared Sub Main()
		Dim renderer As New ChromePdfRenderer()
		Dim userInput As String = "This is a custom speech bubble!"
		Dim dynamicHtml As String = $"<div class='bubble'>{userInput}</div>" & "<style>" & ".bubble {background: #ffcc00; color: #333; font-size: 16px; }" & "</style>"
		Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf(dynamicHtml)
		pdf.SaveAs("speechBubble.pdf")
	End Sub
End Class

PDF Output

C# Convert String to Bubble (How it Works for Developers): Figure 4 - Customized PDF speech bubble output Add from PixabayUpload

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Advanced Features

Overlaying the Bubble on an Existing PDF

Sometimes, you may want to add speech bubbles to an existing PDF instead of generating a new one. IronPDF allows you to overlay HTML elements onto existing PDFs in the form of watermarks.

using IronPdf;
class Program
{
    public static void Main()
    {
        PdfDocument pdf = PdfDocument.FromFile("existing.pdf");
        string newBubble = "<div class='bubble'>New Comment</div>" + "<style>" +
    ".bubble { display: inline-block; background: #f0f0f0; border-radius: 10px; padding: 10px 15px; position: relative; font-family: Arial, sans-serif; }" +
    ".bubble::after { content: ''; position: absolute; bottom: -10px; left: 20px; border-width: 10px; border-style: solid; border-color: #f0f0f0 transparent transparent transparent; }" +
    "</style>";
        pdf.ApplyWatermark(newBubble);
        pdf.SaveAs("updated.pdf");
    }
}

using IronPdf;
class Program
{
    public static void Main()
    {
        PdfDocument pdf = PdfDocument.FromFile("existing.pdf");
        string newBubble = "<div class='bubble'>New Comment</div>" + "<style>" +
    ".bubble { display: inline-block; background: #f0f0f0; border-radius: 10px; padding: 10px 15px; position: relative; font-family: Arial, sans-serif; }" +
    ".bubble::after { content: ''; position: absolute; bottom: -10px; left: 20px; border-width: 10px; border-style: solid; border-color: #f0f0f0 transparent transparent transparent; }" +
    "</style>";
        pdf.ApplyWatermark(newBubble);
        pdf.SaveAs("updated.pdf");
    }
}

Imports IronPdf
Friend Class Program
	Public Shared Sub Main()
		Dim pdf As PdfDocument = PdfDocument.FromFile("existing.pdf")
		Dim newBubble As String = "<div class='bubble'>New Comment</div>" & "<style>" & ".bubble { display: inline-block; background: #f0f0f0; border-radius: 10px; padding: 10px 15px; position: relative; font-family: Arial, sans-serif; }" & ".bubble::after { content: ''; position: absolute; bottom: -10px; left: 20px; border-width: 10px; border-style: solid; border-color: #f0f0f0 transparent transparent transparent; }" & "</style>"
		pdf.ApplyWatermark(newBubble)
		pdf.SaveAs("updated.pdf")
	End Sub
End Class

PDF Output

C# Convert String to Bubble (How it Works for Developers): Figure 5 - Output for adding a speech bubble to an existing PDF Add from PixabayUpload

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As you can see in the above code example, we start by loading in an existing PDF document using PdfDocument.FromFile(), to which we plan to add the new speech bubble to. Then, using simple HTML and CSS, we created the speech bubble in our newBubble string representation of the HTML content. Finally, all we needed to do to apply this new bubble to the PDF was utilize the ApplyWatermark method.

Using tools such as IronPDF's watermarking tool allows developers to apply HTML content to existing PDF documents with ease.

Generating Speech Bubbles from Data

If you need to create speech bubbles dynamically based on user input, a database, or an API, you can loop through your data and generate multiple speech bubbles.

using IronPdf;
class Program
{
    static void Main()
    {
    ChromePdfRenderer renderer = new ChromePdfRenderer();
        List<string> messages = new List<string> { "Hello!", "How are you?", "This is IronPDF!" };
        string htmlBubbles = "";
        foreach (var msg in messages)
        {
            htmlBubbles += $"<div class='bubble'>{msg}</div>";
        }
        var pdf = renderer.RenderHtmlAsPdf(htmlBubbles);
        pdf.SaveAs("updated.pdf");
    }
}

using IronPdf;
class Program
{
    static void Main()
    {
    ChromePdfRenderer renderer = new ChromePdfRenderer();
        List<string> messages = new List<string> { "Hello!", "How are you?", "This is IronPDF!" };
        string htmlBubbles = "";
        foreach (var msg in messages)
        {
            htmlBubbles += $"<div class='bubble'>{msg}</div>";
        }
        var pdf = renderer.RenderHtmlAsPdf(htmlBubbles);
        pdf.SaveAs("updated.pdf");
    }
}

Imports IronPdf
Friend Class Program
	Shared Sub Main()
	Dim renderer As New ChromePdfRenderer()
		Dim messages As New List(Of String) From {"Hello!", "How are you?", "This is IronPDF!"}
		Dim htmlBubbles As String = ""
		For Each msg In messages
			htmlBubbles &= $"<div class='bubble'>{msg}</div>"
		Next msg
		Dim pdf = renderer.RenderHtmlAsPdf(htmlBubbles)
		pdf.SaveAs("updated.pdf")
	End Sub
End Class

PDF Output

C# Convert String to Bubble (How it Works for Developers): Figure 6 - Output PDF file for generating speech bubbles from data Add from PixabayUpload

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This code converts strings from a List into speech bubbles through the use of a foreach loop. By using methods such as this to convert strings into speech bubbles on PDF documents, you can easily turn data such as chat logs, notifications, or even automated reports into easily displayed speech bubbles.

Handling Culture-Specific Formatting Information

When parsing user input, we may need to consider culture-specific formatting information, especially for numeric values.

using System.Globalization;
string value = "1,234.56";
double number = double.Parse(value, CultureInfo.InvariantCulture);

using System.Globalization;
string value = "1,234.56";
double number = double.Parse(value, CultureInfo.InvariantCulture);

Imports System.Globalization
Private value As String = "1,234.56"
Private number As Double = Double.Parse(value, CultureInfo.InvariantCulture)

This ensures consistent number formatting regardless of regional settings.

Using Integer Values in Speech Bubble Handling

Assigning an Integer Variable

We can declare an int variable to store a counter for speech bubbles:

int i = 0;
for (i = 0; i < 5; i++)
{
    Console.WriteLine($"Generating speech bubble {i + 1}");
}

int i = 0;
for (i = 0; i < 5; i++)
{
    Console.WriteLine($"Generating speech bubble {i + 1}");
}

Dim i As Integer = 0
For i = 0 To 4
	Console.WriteLine($"Generating speech bubble {i + 1}")
Next i

Parsing Strings to Integer Values

If we need to parse a string input into an int result, we can use the parse method:

string input = "42";
int result = int.Parse(input);

string input = "42";
int result = int.Parse(input);

Dim input As String = "42"
Dim result As Integer = Integer.Parse(input)

This ensures the text input is converted into a valid format, in the form of a usable numeric format variable.

Creating a Speech Bubble Generator Class

To keep our code structured, we can define a public class for speech bubble generation:

public class SpeechBubbleGenerator
{
    public string GenerateBubble(string text)
    {
        return $"<div class='bubble'>{text}</div>";
    }
}

public class SpeechBubbleGenerator
{
    public string GenerateBubble(string text)
    {
        return $"<div class='bubble'>{text}</div>";
    }
}

Public Class SpeechBubbleGenerator
	Public Function GenerateBubble(ByVal text As String) As String
		Return $"<div class='bubble'>{text}</div>"
	End Function
End Class

Using this class, we can create multiple speech bubbles efficiently.

Conclusion

Speech bubbles add clarity and style to PDFs, making them ideal for annotations, comments, and interactive documents. By using IronPDF, you can easily generate these bubbles with HTML and CSS while leveraging C# for customization and automation. Whether you're overlaying them onto existing PDFs or creating dynamic documents, IronPDF offers a flexible and efficient approach, making it easy to convert strings into readable speech bubbles for your PDF documents.

If you’re looking for a powerful PDF solution in .NET, try IronPDF and start enhancing your PDFs with dynamic, visually appealing content!

Chipego Kalinda

Chat with engineering team now

Software Engineer

Chipego has a natural skill for listening that helps him to comprehend customer issues, and offer intelligent solutions. He joined the Iron Software team in 2023, after studying a Bachelor of Science in Information Technology. IronPDF and IronOCR are the two products Chipego has been focusing on, but his knowledge of all products is growing daily, as he finds new ways to support customers. He enjoys how collaborative life is at Iron Software, with team members from across the company bringing their varied experience to contribute to effective, innovative solutions. When Chipego is away from his desk, he can often be found enjoying a good book or playing football.

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