Given that the current invoice, shipment and credit memo PDFs look the same as in Magento 1 and PDF's are always a bit of a nightmare to customize for the merchants:
I suggest to replace the PDFs with a html2pdf tool. Actually the preview of the invoice looks already really nice in the backend, so this could just be converted to pdf.
This would maybe also help the problem Hirokazu Nishi mentioned in his tweet:
"Magento2 still use LinLibertine font. It’s only for Alphabets. To change PDF font, we still have to rewrite some classes..."
This idea resulted from a tweet/discussion here:
Yes please! At the company I work for we've built an implementation with H4CC Wkhtmltopdf and Snappy php wrapper.
It works brilliantly and isn't too heavy on the server.
Also built in a caching layer saving the PDFs to S3 but that's just being fancy
Right now in Magento 1 we've implemented the PDF's as the emails, with local templates and a variable engine generating the HTML, the actual PDF renderer (snappy) is ambiguous
It's not only font file. Printing some characters that consist of both single-byte and double-bytes, we have to calcluate each words width correctly. Otherwise they are sticking out from rectangle area!
And also Zend_Pdf can't generate PDF files without font file. So multibyte PDF (especially Chinese and Japanese) becomes huge size.
Just found another case where someone would be happy about a HTML invoice PDF:
We have created https://github.com/EaDesgin/magento2-pdf-generator2 some time ago. Maybe will help somebody.
Also supports right left and asian fonts and languages but they are not implemented not implemented.
Magento 2 PDF Customizer ← We have a solution
With this extension, you can make flexible HTML+CSS so to create PDF templates.
Hello Magento Community,
Please have a look at Magento 2 Invoice PDF Editor by Webkul, which allows the admin to customize and redesign templates in a few easy steps that include the drag and drop method and adding their own CSS as well.
If you decide to do this avoid wkhtmltopdf. I've worked extensively with wkhtmltopdf due to using ERPNext which is using wkhtmltopdf and it's causing the following issue:
When you have a table cell that expands over a single page, and a repeating header, the header will overlap with the cell text on the following page. This can happen easily in some cases where you need to add a lot of information for an item and so far neither the wkhtmltopdf team nor the erpnext team was able to fix it. In other cases when the table row has to go in the following page but fits in a single page, the best you can do is actually avoid the break but this leaves huge spaces in the PDF before and after the offending row.
If you track the issue, you can find it's origins in the webkit rendering engine and it goes on for over 6 years.
I do know that tcpdf and other engines are tougher to use but they provide more consistent results than wkhtmltopdf