OCR Line Breaks in Windows Forms TextBox

OCR text extracted with IronOCR can lose its line breaks when shown in a Windows Forms TextBox. The engine returns line feed characters (\n), but Windows expects a carriage return plus line feed (\r\n) to break a line, so the text renders as one run-on block.

Solution

1. Use AdvancedScan in 64-bit Mode

Reference the IronOCR.Extensions.AdvancedScan package for stronger OCR functionality, and run the application in 64-bit mode to avoid compatibility issues.

2. Normalize Line Breaks in the OCR Output

Replace every \n with \r\n before assigning the result to the TextBox. This gives Windows the carriage-return/line-feed pair it needs.

ocr.Language = OcrLanguage.ChineseSimplifiedBest;
using (var ocrInput = new OcrInput())
{
    ocrInput.LoadImage(txtPath.Text);
    ocrInput.Deskew();
    var result = ocr.ReadScreenShot(ocrInput);
    // Replace line feed with carriage return and line feed
    string ocrText = result.Text.Replace("\n", "\r\n");
    // Display the corrected text in a TextBox
    textBox1.Text = ocrText;
}
ocr.Language = OcrLanguage.ChineseSimplifiedBest;
using (var ocrInput = new OcrInput())
{
    ocrInput.LoadImage(txtPath.Text);
    ocrInput.Deskew();
    var result = ocr.ReadScreenShot(ocrInput);
    // Replace line feed with carriage return and line feed
    string ocrText = result.Text.Replace("\n", "\r\n");
    // Display the corrected text in a TextBox
    textBox1.Text = ocrText;
}
Imports System

ocr.Language = OcrLanguage.ChineseSimplifiedBest
Using ocrInput As New OcrInput()
    ocrInput.LoadImage(txtPath.Text)
    ocrInput.Deskew()
    Dim result = ocr.ReadScreenShot(ocrInput)
    ' Replace line feed with carriage return and line feed
    Dim ocrText As String = result.Text.Replace(vbLf, vbCrLf)
    ' Display the corrected text in a TextBox
    textBox1.Text = ocrText
End Using
$vbLabelText   $csharpLabel

result.Text.Replace("\n", "\r\n") does the conversion; the rest of the block loads the image, deskews it, and reads the screenshot.

3. Test and Verify

Run the extraction again and confirm the TextBox content matches the original layout, line breaks included.

Original image:

Source document used as the OCR input

Before:

WinForms TextBox showing OCR text with missing line breaks

After:

WinForms TextBox showing OCR text with correct line breaks after the fix

Curtis Chau
Technical Writer

Curtis Chau holds a Bachelor’s degree in Computer Science (Carleton University) and specializes in front-end development with expertise in Node.js, TypeScript, JavaScript, and React. Passionate about crafting intuitive and aesthetically pleasing user interfaces, Curtis enjoys working with modern frameworks and creating well-structured, visually appealing manuals.

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