OpenPdf

A pure C# PDF library with zero external dependencies. Read, write, and edit PDF files.

Features

Category	Capabilities
Read	Parse PDF 1.0-1.7, xref streams (PDF 1.5+), object streams, tolerant/repair mode
Write	Generate PDF 1.7, FlateDecode compression, incremental updates, linearized PDF
Text	Type1 (standard 14), TrueType/CJK (Japanese/Chinese/Korean) with font subsetting
Graphics	Lines, rectangles, curves, colors (RGB/CMYK), transparency, clipping
Images	JPEG, PNG (RGB/RGBA), BMP (24/32-bit)
Layout	Text wrapping, tables, bullet/numbered lists, headers/footers, page numbers
Annotations	Links, text notes, highlights
Bookmarks	Nested outline/bookmark tree
Forms	Read/write AcroForm text fields and checkboxes
Barcode	Code128B barcode, QR code (vector rendering)
Security	RC4/AES-128 encryption/decryption, password authentication
PDF/A	PDF/A-1b compliant generation and validation
Edit	Page add/delete/reorder, merge, split, page stamping
Metadata	XMP metadata, document info dictionary
Color	DeviceRGB/Gray/CMYK, CalGray/RGB, ICCBased, Separation, DeviceN

Quick Start

Generate a PDF

using OpenPdf.Document;

using var doc = PdfDocument.Create("output.pdf");
var page = doc.AddPage();
var font = page.AddFont("Helvetica");
page.DrawText(font, 24, 72, 700, "Hello, World!");
doc.Save();

Japanese Text (CJK)

using OpenPdf.Document;
using OpenPdf.Fonts;

using var doc = PdfDocument.Create("japanese.pdf");
var page = doc.AddPage(595, 842); // A4
var ttf = TrueTypeFont.Load(@"C:\Windows\Fonts\meiryo.ttc", 0);
var font = page.AddTrueTypeFont(ttf);
page.DrawText(font, 24, 72, 770, "こんにちは世界！");
doc.Save();

Read a PDF

using OpenPdf.Document;

using var reader = PdfReader.Open("input.pdf");
Console.WriteLine($"Pages: {reader.PageCount}");
Console.WriteLine($"Version: {reader.Version}");

var extractor = new TextExtractor(reader);
Console.WriteLine(extractor.ExtractAllText());

Merge PDFs

using OpenPdf.Document;

PdfMerger.Merge(
    new[] { "file1.pdf", "file2.pdf", "file3.pdf" },
    "merged.pdf"
);

Table

var table = new TableBuilder(page, font, 10,
    new[] { 100.0, 150.0, 100.0 });
table.AddHeaderRow("Name", "Value", "Unit");
table.AddRow("Width", "210", "mm");
table.AddRow("Height", "297", "mm");
table.Draw(72, 700);

QR Code

using OpenPdf.Barcode;

QrCodeEncoder.DrawQrCode(page, "https://example.com", 72, 600, moduleSize: 4);

PDF/A-1b

using var doc = PdfADocument.Create("archive.pdf");
var page = doc.AddPage();
var font = page.AddFont("Helvetica");
page.DrawText(font, 12, 72, 770, "Long-term archival document");
doc.SetInfo("Title", "Author");
doc.Save();

Installation

dotnet add package OpenPdf

Requirements

• .NET 10.0 or .NET Standard 2.0

License

MIT