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IronOCR Library for C# IronOCR Library for C#
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IronOCR
Code Examples
  1. IronOCR
  2. Code Examples
  3. Tesseract 3 Engine
IronOCR
Free for development from NuGet

Install with NuGet nuget.org/packages/IronOcr

PM > Install-Package IronOcr

Explore the Docs

  • Get Started
  • Languages
  • Code Examples
    • C# Image to Text
    • C# Tesseract OCR
    • OCR Image Filters
    • License Keys
    • Tesseract Configuration Variables
    • PDF Document OCR in .NET
    • OCR on Azure [Setup & Compatibility]
    • OCR on Linux [Setup & Compatibility]
    • OCR on Docker [Setup & Compatibility]
    • Contacting Technical Support
      • How to Make an Engineering Support Request for IronOCR
      • Getting the Best Support for IronOCR
    • Troubleshooting Guides
      • Apply a license key in IronOCR
      • X and Y coordinates change in OcrResult Class
      • Reduce file size of output PDF in IronOcr
      • Captcha
      • Content Areas & Crop Regions with PDFs
      • Save image with different image processing applied
      • Quick IronOCR Troubleshooting
      • Identity Documents
    • Language Packs
      • Dot Matrix OCR
      • Custom OCR Language Packs
      • Equations
      • 7 Segment Digital/LCD Displays
      • Financial Language Pack
      • Arabic Numerals
      • Slashed zeros
    • Exception Messages
      • Tesseract Fallback Logic
      • System.Drawing.Common in NET6
      • Azure Functions Deployment
      • libgdiplus
      • Visual C++ Redistributable for Visual Studio
      • SEHException with Celeron CPUs
      • leptonica-1.78.0.dll
    • Product Release Notes
      • IronOCR v2021.11.0
      • IronOCR v2022.1.0
      • IronOCR v2021.12.0
  • API Reference
OCR in 1 line of code
PDF OCR Text Extraction
OCR with Barcode & QR Reading
125 International OCR Languages
Fixing Low Quality Scans & Images
Fast OCR Configuration
OCR Image Optimization Filters
OCR Image Color Editing
OcrResult Class
Create Searchable PDFs by OCR
Tesseract 5 for .NET
Tesseract 4 for .NET
Tesseract 3 Legacy for .NET
Tesseract Detailed Configuration
OcrInput Class
OCR a Region of an Image
TIFF to Serchable PDF Converter
Image Resolution Optimization (DPI)
MultiThreaded Tesseract OCR
OCR Progress and Performance Tracking
OCR for MultiPage TIFF Files
Make any PDF have Searchable, Copyable Text
Using Custom Tesseract Language Files
Multiple Languages for 1 Document
Exporting Images of OCR Elements

Tesseract 3 Legacy for .NET

using IronOcr;
var Ocr = new IronTesseract();

//Legacy Tesseract 3 OEM engine
Ocr.Configuration.EngineMode = TesseractEngineMode.TesseractOnly;

Ocr.Language = OcrLanguage.English;  // Does not support any Dictionaries marked Best or Fast

using (var Input = new OcrInput(@"images\image.png"))
{
    OcrResult Result = Ocr.Read(Input);
    Console.WriteLine(Result.Text);
}
Imports IronOcr
Private Ocr = New IronTesseract()

'Legacy Tesseract 3 OEM engine
Ocr.Configuration.EngineMode = TesseractEngineMode.TesseractOnly

Ocr.Language = OcrLanguage.English ' Does not support any Dictionaries marked Best or Fast

Using Input = New OcrInput("images\image.png")
	Dim Result As OcrResult = Ocr.Read(Input)
	Console.WriteLine(Result.Text)
End Using
Read more
Install-Package IronOcr

Tesseract 3 Legacy for .NET

IronOCR fully supports Tesseract 3 for legacy support. We recommend Tesseract 5 as being much faster and accurate

IronOCR Supports Tesseract 3, Tesseract 4 and Tesseract 5 for .NET Framework, Standard, Core, Xamarin and Mono.
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Ready to get started? Version: 2022.3.0 just released

Free NuGet Download Total downloads: 431,425 View Licenses >
Try IronOCR for Free
Get Set Up in 5 Minutes
C# Nuget Library for PDF
Install with NuGet
Version: 2022.3.0
Install-Package IronOcr
nuget.org/packages/IronOcr/
  1. In Solution Explorer, right-click References, Manage NuGet Packages
  2. Select Browse and search "IronOCR"
  3. Select the package and install
C# PDF DLL
Download DLL
Version: 2022.3.0
Download Now
Manually install into your project
  1. Download and unzip IronOCR to a location such as ~/Libs within your Solution directory
  2. In Visual Studio Solution Explorer, right click References. Select Browse, "IronOCR.dll"
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Have a question? Get in touch with our development team.
Want to deploy IronOCR to a live project for FREE?
Not ready to buy?

Want to deploy IronOCR to a live project for FREE?

What’s included?
30 days of fully-functional product
Test and share in a live environment
No restrictions in production
Get your free 30-day Trial Key instantly.
Thank you.
If you'd like to speak to our licensing team:
Schedule a call
Have a question? Get in touch with our development team.
No credit card or account creation required
Your Trial License Key has been emailed to you.
Not ready to buy?
Download IronOCR free to apply
your Trial Licenses Key
Thank you.
If you'd like to speak to our licensing team:
Install with NuGet View Licenses
Schedule a call
Licenses from $499. Have a question? Get in touch.
Have a question? Get in touch with our development team.
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IronOCR for .NET

Tesseract 5 OCR in the languages you need, We support 127+.

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When you need your PDF to look like HTML, fast.

Tesseract 5 OCR in the languages you need, We support 127+.

When you need to read, write, and style, QR & Barcodes, fast.

The Excel API you need, without the Office Interop hassle.

The power you need to scrape & output clean, structured data.

The complete .NET Suite for your office.

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