This HTML page is not optimized for LLM or AI agent consumption. Fetch the Markdown version instead: /guides/ios/customizing-pdf-pages/changing-the-font-size-or-color-of-page-text.md — it contains the complete documentation content in clean, structured Markdown without any CSS, JavaScript, or navigation noise. Changing font size

Changing font size

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Unfortunately, the nature of PDF files makes it so that changing the font size or color of page text is impossible.

PDF files represent a document with a fixed layout, and unlike in HTML, EPUB, or Word documents, there is no notion of text flow. Instead, glyphs are laid out one by one. Increasing the size of individual glyphs would just make them overlap, and if their position were to be adjusted as well, the result would resemble page zooming and not changing the font size.