Batch-converting the traditional Chinese characters in a Hong Kong stock interim report to simplified sounds as simple as find-and-replace. Once we actually tried it, we found PDF is an extremely unfriendly format for "changing characters": the glyph, position, spacing, images, and font encoding...
Source: [Dev.to](https://dev.to/eyanpen/converting-traditional-chinese-to-simplified-in-pdfs-why-we-ended-up-with-a-combined-approach-4ifk)