C# .NET Core, Java, Python, PHP, Node.js, Python, JavaScript, C++, Android, Swift, Go, Ruby, Dart, Perl APIs to create and convert PDF, Word, Excel, PowerPoint, email, JPG, image, ZIP, and other formats on Windows, Linux, macOS & Android....photo 1 grayscale picture 1 highlight pdfs 1 how to add annotations...compare 1 Text diff 1 text highlight in pdf 1 theme power point...