Usage exampleįor this example, we'll demonstrate using pdfCalligraph to correctly render text in different languages. If you don't have a commercial license for pdfCalligraph, you can get a free trial of the iText 7 Suite which includes the iText 7 Core library, plus all the add-ons. To use pdfCalligraph you simply load the correct binaries into your project, make sure your valid license file is loaded, and iText 7 will automatically use the pdfCalligraph code when it is required by a document. However, as the typography logic is complex and can be resource-heavy even for documents that don’t require this functionality, iText won't attempt any advanced shaping operations if the pdfCalligraph module has not been loaded as a binary dependency. For example, when iText encounters text that contain Indic texts, or a script that's written from right to left, iText checks if pdfCalligraph is available and will then use its functionality to provide the correct glyph shapes to write to the PDF file. The iText layout module will automatically look for pdfCalligraph in its dependencies if text if a language or writing system that requires it is encountered by the Renderer Framework. How does pdfCalligraph integrate with iText 7? But first, here’s a short explanation of how pdfCalligraph works. I n this article, we’ll demonstrate how you can use pdfCalligraph with iText to create a PDF containing text using different languages. For detailed information about the inherent difficulties of supporting multiple languages and writing systems in the PDF standard, and the powerful and unique solutions pdfCalligraph provides, we recommend reading the pdfCalligraph white paper. However, we decided to go a step further and created pdfCalligraph, a commercially licensed add-on module for the iText 7 library which was specifically designed to support many more languages and writing systems, and like iText 7 it's available for both the Java and. So, for iText 7 we went back to the drawing board to provide OpenType support for advanced font features in PDF documents. Update Dec 2021: I'm still using pdf-lib and I think it's still the best available library, but there are a lot of new libraries that have come out in the last couple of years for handling PDFs, so it's worth looking around a bit.How can I display text in different languages in a single PDF?Įarlier versions of the iText PDF library were already able to render Chinese, Japanese and Korean glyphs in PDF documents, but to correctly display right-to-left scripts like Hebrew and Arabic, we needed the information provided by OpenType fonts to help with handling the complexities of all the world's writing systems. Not exactly the same thing but can be used with other tools to do digital signatures on a PDF. This one should be one of the best options out there, but I couldn't get it working myself on a mac It's worth noting that pdf-lib doesn't support loading encrypted pdfs, but you can use something like qpdf to strip the encryption before loading it. It may have limitations for extremely large PDFs, but it is constantly improving and you can do nearly anything with it - if not through the helper API then through the abstraction they provide which allows you to use nearly any raw PDF feature, though that requires more knowledge of the PDF file format than most possess. Pdf-lib - This one is my current favorite it works great. Since this question still gets a lot of attention I thought I'd come back and update with some other options: Update April 2020: In the intervening years since I posted this other options have cropped up which look like they should work. After a lot of searching and nearly giving up, I did eventually find that the HummusJS library will do what I want to do!
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