Purchase $19standard fonts like Helvetica do not support Unicode characters. You must embed a Khmer-specific font (e.g., Battambang or Noto Khmer) by loading the file from your assets folder or using the GoogleFonts Initial Font Loading:
packages with embedded Unicode fonts and active text shaping. syncfusion_flutter_pdf | Flutter package - Pub.dev flutter khmer pdf updated
Instead:
Generating PDFs with Khmer Unicode in Flutter requires specific font handling to avoid common issues like missing characters (square boxes) or incorrect text rendering (character reordering). Overview of Khmer PDF Generation Flutter's native PDF libraries (like syncfusion_flutter_pdf standard fonts like Helvetica do not support Unicode