2025 가이드: 최고의 C# PDF 라이브러리 (먼저 무료, 필요시 유료)

HTML을 PDF로 변환

using IronPdf;
var renderer = new ChromePdfRenderer();

// 1. HTML String to PDF
var pdf1 = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");
pdf1.SaveAs("html-string.pdf");

// 2. HTML String with Assets (Images, CSS, JS)
var pdf2 = renderer.RenderHtmlAsPdf(
    "<img src='logo.png'><link rel='stylesheet' href='style.css'>",
    @"C:\assets\"
);
pdf2.SaveAs("html-with-assets.pdf");

// 3. HTML File to PDF
var pdf3 = renderer.RenderHtmlFileAsPdf("example.html");
pdf3.SaveAs("html-file.pdf");

// 4. URL to PDF
var pdf4 = renderer.RenderUrlAsPdf("https://ironpdf.com");
pdf4.SaveAs("url.pdf");

using IronPdf;
var renderer = new ChromePdfRenderer();

// 1. HTML String to PDF
var pdf1 = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");
pdf1.SaveAs("html-string.pdf");

// 2. HTML String with Assets (Images, CSS, JS)
var pdf2 = renderer.RenderHtmlAsPdf(
    "<img src='logo.png'><link rel='stylesheet' href='style.css'>",
    @"C:\assets\"
);
pdf2.SaveAs("html-with-assets.pdf");

// 3. HTML File to PDF
var pdf3 = renderer.RenderHtmlFileAsPdf("example.html");
pdf3.SaveAs("html-file.pdf");

// 4. URL to PDF
var pdf4 = renderer.RenderUrlAsPdf("https://ironpdf.com");
pdf4.SaveAs("url.pdf");

PDF에서 텍스트와 이미지 추출

using IronPdf;
using IronSoftware.Drawing;
using System.Collections.Generic;

// Load PDF document
var pdf = PdfDocument.FromFile("sample.pdf");

// 1. Extract All Text
string allText = pdf.ExtractAllText();

// 2. Extract Text from Specific Page
string pageText = pdf.ExtractTextFromPage(0); 

// 3. Extract Text from Multiple Pages
for (int i = 0; i < pdf.PageCount; i++)
{
    string text = pdf.ExtractTextFromPage(i);
    Console.WriteLine($"Page {i + 1}: {text}");
}

// 4. Extract All Images
var allImages = pdf.ExtractAllImages();
foreach (var image in allImages)
{
    image.SaveAs($"image_{allImages.IndexOf(image)}.png");
}

// 5. Extract Images from Specific Page
List<AnyBitmap> pageImages = pdf.ExtractBitmapsFromPage(0);

// 6. Extract Raw Images (as byte arrays)
var rawImages = pdf.ExtractAllRawImages();
for (int i = 0; i < rawImages.Count; i++)
{
    System.IO.File.WriteAllBytes($"raw_image_{i}.png", rawImages[i]);
}

// 7. Extract Both Text & Images from Each Page
for (int i = 0; i < pdf.PageCount; i++)
{
    string text = pdf.ExtractTextFromPage(i);
    List<AnyBitmap> images = pdf.ExtractBitmapsFromPage(i);

    Console.WriteLine($"Page {i + 1}: {text}");
    Console.WriteLine($"Found {images.Count} images");
}

using IronPdf;
using IronSoftware.Drawing;
using System.Collections.Generic;

// Load PDF document
var pdf = PdfDocument.FromFile("sample.pdf");

// 1. Extract All Text
string allText = pdf.ExtractAllText();

// 2. Extract Text from Specific Page
string pageText = pdf.ExtractTextFromPage(0); 

// 3. Extract Text from Multiple Pages
for (int i = 0; i < pdf.PageCount; i++)
{
    string text = pdf.ExtractTextFromPage(i);
    Console.WriteLine($"Page {i + 1}: {text}");
}

// 4. Extract All Images
var allImages = pdf.ExtractAllImages();
foreach (var image in allImages)
{
    image.SaveAs($"image_{allImages.IndexOf(image)}.png");
}

// 5. Extract Images from Specific Page
List<AnyBitmap> pageImages = pdf.ExtractBitmapsFromPage(0);

// 6. Extract Raw Images (as byte arrays)
var rawImages = pdf.ExtractAllRawImages();
for (int i = 0; i < rawImages.Count; i++)
{
    System.IO.File.WriteAllBytes($"raw_image_{i}.png", rawImages[i]);
}

// 7. Extract Both Text & Images from Each Page
for (int i = 0; i < pdf.PageCount; i++)
{
    string text = pdf.ExtractTextFromPage(i);
    List<AnyBitmap> images = pdf.ExtractBitmapsFromPage(i);

    Console.WriteLine($"Page {i + 1}: {text}");
    Console.WriteLine($"Found {images.Count} images");
}

PDF 문서 편집: 헤더 및 푸터

using IronPdf;
using System;
var renderer = new ChromePdfRenderer();

// 1. Add Footer with Page Numbers
renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter()
{
    HtmlFragment = "<center><i>{page} of {total-pages}</i></center>",
    MaxHeight = 15, // mm
    DrawDividerLine = true
};
renderer.RenderingOptions.MarginBottom = 25;

// 2. Add Header with Logo
renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter()
{
    HtmlFragment = "<img src='logo.png'>",
    MaxHeight = 20, // mm
    BaseUrl = new Uri(@"C:\assets\images\").AbsoluteUri
};
renderer.RenderingOptions.MarginTop = 25;

// 3. Render HTML to PDF
var pdf = renderer.RenderHtmlAsPdf("<h1>Document Title</h1><p>Content...</p>");
pdf.SaveAs("output.pdf");

using IronPdf;
using System;
var renderer = new ChromePdfRenderer();

// 1. Add Footer with Page Numbers
renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter()
{
    HtmlFragment = "<center><i>{page} of {total-pages}</i></center>",
    MaxHeight = 15, // mm
    DrawDividerLine = true
};
renderer.RenderingOptions.MarginBottom = 25;

// 2. Add Header with Logo
renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter()
{
    HtmlFragment = "<img src='logo.png'>",
    MaxHeight = 20, // mm
    BaseUrl = new Uri(@"C:\assets\images\").AbsoluteUri
};
renderer.RenderingOptions.MarginTop = 25;

// 3. Render HTML to PDF
var pdf = renderer.RenderHtmlAsPdf("<h1>Document Title</h1><p>Content...</p>");
pdf.SaveAs("output.pdf");

폼 처리

using IronPdf;

// Load existing PDF with form fields
var pdf = PdfDocument.FromFile("EditableForm.pdf");

// Fill text fields
pdf.Form.FindFormField("firstname").Value = "John";
pdf.Form.FindFormField("lastname").Value = "Smith";
pdf.Form.FindFormField("email").Value = "john.smith@example.com";

// Fill radio button
pdf.Form.FindFormField("gender").Value = "Male";

// Fill dropdown/combobox
pdf.Form.FindFormField("country").Value = "USA";

// Fill checkbox ("Yes" to check, "No" to uncheck)
pdf.Form.FindFormField("subscribe").Value = "Yes";

// Fill textarea (use \r\n for line breaks)
pdf.Form.FindFormField("comments").Value = "This is a comment.\r\nSecond line here.";

// Save filled form
pdf.SaveAs("FilledForm.pdf");

using IronPdf;

// Load existing PDF with form fields
var pdf = PdfDocument.FromFile("EditableForm.pdf");

// Fill text fields
pdf.Form.FindFormField("firstname").Value = "John";
pdf.Form.FindFormField("lastname").Value = "Smith";
pdf.Form.FindFormField("email").Value = "john.smith@example.com";

// Fill radio button
pdf.Form.FindFormField("gender").Value = "Male";

// Fill dropdown/combobox
pdf.Form.FindFormField("country").Value = "USA";

// Fill checkbox ("Yes" to check, "No" to uncheck)
pdf.Form.FindFormField("subscribe").Value = "Yes";

// Fill textarea (use \r\n for line breaks)
pdf.Form.FindFormField("comments").Value = "This is a comment.\r\nSecond line here.";

// Save filled form
pdf.SaveAs("FilledForm.pdf");

위의 예제에서 볼 수 있듯이 IronPDF를 사용하여 몇 줄만으로 PDF 파일에서 모든 작업을 수행할 수 있습니다. 매우 간단하고 직관적입니다. 메소드 이름은 이해하고 구현하기 쉽습니다.

텍스트, 이미지 및 테이블로 PDF 문서 생성

using Aspose.Pdf;
using Aspose.Pdf.Text;

using (var document = new Document())
{
    // Add page objects
    var page = document.Pages.Add();

    // Add image - requires Rectangle positioning (You can add tiff images as well)
    page.AddImage("logo.png", new Rectangle(20, 730, 120, 830));

    // Add text - requires manual positioning
    var header = new TextFragment("Company Report");
    header.TextState.Font = FontRepository.FindFont("Arial");
    header.TextState.FontSize = 24;
    header.HorizontalAlignment = HorizontalAlignment.Center;
    header.Position = new Position(130, 720);
    page.Paragraphs.Add(header);

    // Add table - extensive configuration required
    var table = new Table
    {
        ColumnWidths = "100 100 100",
        Border = new BorderInfo(BorderSide.Box, 1f, Color.Black),
        DefaultCellBorder = new BorderInfo(BorderSide.Box, 0.5f, Color.Gray),
        DefaultCellPadding = new MarginInfo(4.5, 4.5, 4.5, 4.5)
    };

    // Add header row
    var headerRow = table.Rows.Add();
    headerRow.Cells.Add("Name");
    headerRow.Cells.Add("Age");
    headerRow.Cells.Add("City");

    // Style each header cell individually
    foreach (Cell cell in headerRow.Cells)
    {
        cell.BackgroundColor = Color.LightGray;
        cell.DefaultCellTextState.FontSize = 12;
    }

    // Add data row
    var dataRow = table.Rows.Add();
    dataRow.Cells.Add("John Doe");
    dataRow.Cells.Add("30");
    dataRow.Cells.Add("New York");

    page.Paragraphs.Add(table);

    // Save document
    document.Save("Report.pdf");
}

using Aspose.Pdf;
using Aspose.Pdf.Text;

using (var document = new Document())
{
    // Add page objects
    var page = document.Pages.Add();

    // Add image - requires Rectangle positioning (You can add tiff images as well)
    page.AddImage("logo.png", new Rectangle(20, 730, 120, 830));

    // Add text - requires manual positioning
    var header = new TextFragment("Company Report");
    header.TextState.Font = FontRepository.FindFont("Arial");
    header.TextState.FontSize = 24;
    header.HorizontalAlignment = HorizontalAlignment.Center;
    header.Position = new Position(130, 720);
    page.Paragraphs.Add(header);

    // Add table - extensive configuration required
    var table = new Table
    {
        ColumnWidths = "100 100 100",
        Border = new BorderInfo(BorderSide.Box, 1f, Color.Black),
        DefaultCellBorder = new BorderInfo(BorderSide.Box, 0.5f, Color.Gray),
        DefaultCellPadding = new MarginInfo(4.5, 4.5, 4.5, 4.5)
    };

    // Add header row
    var headerRow = table.Rows.Add();
    headerRow.Cells.Add("Name");
    headerRow.Cells.Add("Age");
    headerRow.Cells.Add("City");

    // Style each header cell individually
    foreach (Cell cell in headerRow.Cells)
    {
        cell.BackgroundColor = Color.LightGray;
        cell.DefaultCellTextState.FontSize = 12;
    }

    // Add data row
    var dataRow = table.Rows.Add();
    dataRow.Cells.Add("John Doe");
    dataRow.Cells.Add("30");
    dataRow.Cells.Add("New York");

    page.Paragraphs.Add(table);

    // Save document
    document.Save("Report.pdf");
}

새로운 PDF 문서를 생성하는 데 필요한 Aspose.PDF의 코드는 매우 복잡함을 볼 수 있습니다. 코드 자체에서 모든 좌표를 수동으로 설정해야 합니다. 각 PDF 객체 요소를 수동으로 스타일링해야 하며 이는 매우 시간이 많이 소요되고 비효율적입니다. 그러나 PDF 문서에 대한 세밀한 제어를 제공합니다.

스타일링 및 색상으로 PDF 문서 테이블 생성

using iText.Kernel.Colors;
using iText.Kernel.Pdf;
using iText.Layout;
using iText.Layout.Element;
using iText.Layout.Properties;

public void CreateStyledTable(string dest)
{
    using var writer = new PdfWriter(dest);
    using var pdf = new PdfDocument(writer);
    var document = new Document(pdf);

    // Create a 2-column table
    Table table = new Table(2, false);

    // Header cells with gray background
    Cell cell11 = new Cell(1, 1)
        .SetBackgroundColor(ColorConstants.GRAY)
        .SetTextAlignment(TextAlignment.CENTER)
        .Add(new Paragraph("State"));

    Cell cell12 = new Cell(1, 1)
        .SetBackgroundColor(ColorConstants.GRAY)
        .SetTextAlignment(TextAlignment.CENTER)
        .Add(new Paragraph("Capital"));

    // Data cells
    Cell cell21 = new Cell(1, 1)
        .SetTextAlignment(TextAlignment.CENTER)
        .Add(new Paragraph("New York"));

    Cell cell22 = new Cell(1, 1)
        .SetTextAlignment(TextAlignment.CENTER)
        .Add(new Paragraph("Albany"));

    Cell cell31 = new Cell(1, 1)
        .SetTextAlignment(TextAlignment.CENTER)
        .Add(new Paragraph("New Jersey"));

    Cell cell32 = new Cell(1, 1)
        .SetTextAlignment(TextAlignment.CENTER)
        .Add(new Paragraph("Trenton"));

    // Add all cells to table
    table.AddCell(cell11);
    table.AddCell(cell12);
    table.AddCell(cell21);
    table.AddCell(cell22);
    table.AddCell(cell31);
    table.AddCell(cell32);

    document.Add(table);
    document.Close();
}

using iText.Kernel.Colors;
using iText.Kernel.Pdf;
using iText.Layout;
using iText.Layout.Element;
using iText.Layout.Properties;

public void CreateStyledTable(string dest)
{
    using var writer = new PdfWriter(dest);
    using var pdf = new PdfDocument(writer);
    var document = new Document(pdf);

    // Create a 2-column table
    Table table = new Table(2, false);

    // Header cells with gray background
    Cell cell11 = new Cell(1, 1)
        .SetBackgroundColor(ColorConstants.GRAY)
        .SetTextAlignment(TextAlignment.CENTER)
        .Add(new Paragraph("State"));

    Cell cell12 = new Cell(1, 1)
        .SetBackgroundColor(ColorConstants.GRAY)
        .SetTextAlignment(TextAlignment.CENTER)
        .Add(new Paragraph("Capital"));

    // Data cells
    Cell cell21 = new Cell(1, 1)
        .SetTextAlignment(TextAlignment.CENTER)
        .Add(new Paragraph("New York"));

    Cell cell22 = new Cell(1, 1)
        .SetTextAlignment(TextAlignment.CENTER)
        .Add(new Paragraph("Albany"));

    Cell cell31 = new Cell(1, 1)
        .SetTextAlignment(TextAlignment.CENTER)
        .Add(new Paragraph("New Jersey"));

    Cell cell32 = new Cell(1, 1)
        .SetTextAlignment(TextAlignment.CENTER)
        .Add(new Paragraph("Trenton"));

    // Add all cells to table
    table.AddCell(cell11);
    table.AddCell(cell12);
    table.AddCell(cell21);
    table.AddCell(cell22);
    table.AddCell(cell31);
    table.AddCell(cell32);

    document.Add(table);
    document.Close();
}

위의 예제에서 iTextSuite 코드의 복잡성을 이해할 수 있습니다. 이는 대형 애플리케이션을 구축하는 데 개발 시간과 복잡성을 증가시킵니다.

다양한 텍스트 스타일로 PDF 생성

using PdfSharp.Pdf;
using PdfSharp.Drawing;

// Create document
PdfDocument document = new PdfDocument();
PdfPage page = document.AddPage();
XGraphics gfx = XGraphics.FromPdfPage(page);

// Example of different font styles
XFont regularFont = new XFont("Arial", 12, XFontStyleEx.Regular);
XFont boldFont = new XFont("Arial", 12, XFontStyleEx.Bold);
XFont italicFont = new XFont("Arial", 12, XFontStyleEx.Italic);
XFont boldItalicFont = new XFont("Arial", 12, XFontStyleEx.BoldItalic);

// Position for the first text
double y = 50;
double x = 50;
double lineHeight = 20;

// Draw text in different styles - REQUIRES manual positioning
gfx.DrawString("Regular text in Arial", regularFont, XBrushes.Black, x, y);
y += lineHeight;
gfx.DrawString("Bold text in Arial", boldFont, XBrushes.Black, x, y);
y += lineHeight;
gfx.DrawString("Italic text in Arial", italicFont, XBrushes.Black, x, y);
y += lineHeight;
gfx.DrawString("Bold and Italic text in Arial", boldItalicFont, XBrushes.Black, x, y);

// Save document
document.Save("FormattedText.pdf");

using PdfSharp.Pdf;
using PdfSharp.Drawing;

// Create document
PdfDocument document = new PdfDocument();
PdfPage page = document.AddPage();
XGraphics gfx = XGraphics.FromPdfPage(page);

// Example of different font styles
XFont regularFont = new XFont("Arial", 12, XFontStyleEx.Regular);
XFont boldFont = new XFont("Arial", 12, XFontStyleEx.Bold);
XFont italicFont = new XFont("Arial", 12, XFontStyleEx.Italic);
XFont boldItalicFont = new XFont("Arial", 12, XFontStyleEx.BoldItalic);

// Position for the first text
double y = 50;
double x = 50;
double lineHeight = 20;

// Draw text in different styles - REQUIRES manual positioning
gfx.DrawString("Regular text in Arial", regularFont, XBrushes.Black, x, y);
y += lineHeight;
gfx.DrawString("Bold text in Arial", boldFont, XBrushes.Black, x, y);
y += lineHeight;
gfx.DrawString("Italic text in Arial", italicFont, XBrushes.Black, x, y);
y += lineHeight;
gfx.DrawString("Bold and Italic text in Arial", boldItalicFont, XBrushes.Black, x, y);

// Save document
document.Save("FormattedText.pdf");

PDFSharp는 기본 PDF 생성에 필요하고 정밀한 위치 제어가 필요한 개발자에게 경량의 무료 솔루션으로 여전히 탄탄한 선택입니다. 단지 그 제한 사항을 극복하거나 더 고급 요구 사항을 위해 다른 도구와 결합하여 사용 준비를 해야 합니다.

기본 텍스트 추출

using System;
using System.Collections.Generic;
using System.Linq;
using UglyToad.PdfPig;
using UglyToad.PdfPig.Content;

public static class Program
{
    public static void Main()
    {
        using (PdfDocument document = PdfDocument.Open(@"C:\path\to\file.pdf"))
        {
            foreach (Page page in document.GetPages())
            {
                // Extract all letters
                IReadOnlyList<Letter> letters = page.Letters;
                string text = string.Join(string.Empty, letters.Select(x => x.Value));

                // Extract words
                IEnumerable<Word> words = page.GetWords();

                // Extract images
                IEnumerable<IPdfImage> images = page.GetImages();
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using UglyToad.PdfPig;
using UglyToad.PdfPig.Content;

public static class Program
{
    public static void Main()
    {
        using (PdfDocument document = PdfDocument.Open(@"C:\path\to\file.pdf"))
        {
            foreach (Page page in document.GetPages())
            {
                // Extract all letters
                IReadOnlyList<Letter> letters = page.Letters;
                string text = string.Join(string.Empty, letters.Select(x => x.Value));

                // Extract words
                IEnumerable<Word> words = page.GetWords();

                // Extract images
                IEnumerable<IPdfImage> images = page.GetImages();
            }
        }
    }
}