Devices, methods, and graphical user interfaces for document manipulation

An electronic device displays at least a portion of an electronic document with a predefined page layout at a first magnification level on a display; detects a first input indicating a first insertionpoint in the document, where the first insertion point is proximate to a first portion of text in the document; and in response to detecting the first input: selects a second magnification level different from the first magnification level, where the second magnification level is selected so as to display the first portion of text at a target text display size, and, while maintaining the predefined page layout of the document, displays, at the second magnification level, a portion of the document that includes the first portion of text. 种电子设备在显示器上以第放大级别显示具有预定义页面布局的电子文档的至少部分；检测指示文档中的第插入点的第输入，其中第插入点邻近文档中的文本的第部分；以及响应于检测到第输入：选择不同于第放大级别的第二放大级别，其中第二放大级别被选择以便以目标文本显示大小显示文本的第部分；以及在保持文档的预定义页面布局的同时，以第二放大级别显示包括文本的第部分的文档的部分。