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Open Source C# .NET API for Faster OCR Text Recognition

Free C# .NET Optical Character Recognition (OCR) API for Faster Text Recognition from Images, Including Scanned Documents, Multi-page PDFs, and Photographs.

What is Free-OCR-API-CSharp?

In the era of accelerated digital transformation, the demand for fast, precise text extraction from documents and images is critical. Optical Character Recognition (OCR) stands as the foundational technology that enables this, converting printed or handwritten text into machine-readable data. For developers seeking a powerful yet accessible solution, the Free-OCR-API-CSharp offers a seamless, fully free .NET OCR API. Designed specifically for C# and .NET environments, this reliable C# OCR API requires no external dependencies, registration, or licensing fees. It provides a straightforward, cost-effective path to integrate robust OCR capabilities, making it an ideal choice for startups, independent developers, and enterprises building applications that require hassle-free text extraction and document processing.

The true strength of this solution lies in its advanced, fast OCR API engine. It delivers rapid text recognition with impressive accuracy across diverse sources like scanned documents, photographs, and PDF files. Capable of processing various font styles and sizes, it also supports multiple languages—including English, French, German, Italian, Portuguese, and Spanish—enhancing its utility for global applications. By choosing Free-OCR-API-CSharp, developers gain an optimal blend of speed and precision, essential for creating modern automation workflows, data extraction systems, and intelligent document processing tools. This free .NET OCR API represents a smart, powerful, and easy-to-implement choice for any project demanding efficient and accurate OCR functionality.

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Getting Started with Free-OCR-API-CSharp

The recommend way to install Free-OCR-API-CSharp is using NuGet. Please use the following command for a smooth installation.

Install Free-OCR-API-CSharp via NuGet

 Install-Package Free-OCR-API-CSharp

You can also install it manually; download the latest release files directly from GitHub repository.

Recognize Text from Images via C# OCR API

The open source API Free-OCR-API-CSharp has included support for a great feature for speedy recognizing text from various types of image in various languages inside .NET applications. To achieve the task software developers just need to load their image into a byte array and call the OCR method of the FreeOcrApi instance, passing in the byte array and the language of the text to recognize. The library also provides a great feature for batch recognize text from multiple files at once making it easy to process a lot of files at once. The following example shows how to recognize text from images using C# .NET code.

How to Recognize Text from Images via C# API?

using System;
using System.IO;
using FreeOcrApi;
var ocr = new FreeOcrApi("your-api-key");

// Load your image file into a byte array:
byte[] imageData = File.ReadAllBytes("path-to-your-image-file");
string recognizedText = ocr.OCR(imageData, "eng");

// Finally, display the recognized text in the console or save it to a file:
Console.WriteLine(recognizedText);
File.WriteAllText("path-to-output-file", recognizedText);

Create Searchable PDF File via C# API

The open source API Free-OCR-API-CSharp allows software developers to create searchable PDFs (also known as Sandwich PDFs) directly inside their own C# applications. By default, the added text layer is visible which gives users an great opportunity for testing the result as they can compare the OCR'ed output directly with the scan image. The following example demonstrates how software developers can load an image and convert it into search PDF documents using C# code.

How to Create Searchable PDF via C# ApI?

using System.IO;
using FreeOcrApi;
using PdfSharpCore.Drawing;
using PdfSharpCore.Pdf;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            FreeOcrApiWrapper api = new FreeOcrApiWrapper("YOUR_API_KEY");
            MemoryStream imageStream = new MemoryStream(File.ReadAllBytes("path/to/image.jpg"));
            string text = api.Recognize(imageStream);
            PdfDocument pdf = new PdfDocument();
            PdfPage page = pdf.AddPage();
            XGraphics gfx = XGraphics.FromPdfPage(page);
            XFont font = new XFont("Verdana", 12, XFontStyle.Regular);
            gfx.DrawString(text, font, XBrushes.Black, new XRect(0, 0, page.Width, page.Height), XStringFormats.TopLeft);
            pdf.Save("path/to/output.pdf");
        }
    }
}
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