Dynamically resizing a text area in which text is displayed on a display device. A camera device periodically captures snapshots of a user's gaze point and head position while reading text, and the captured snapshots are used to detect movement of the user's head. Head movement suggests that the text area is too wide for comfortable viewing. Accordingly, the width of the text area is automatically resized, responsive to detecting head movement. Preferably, the resized width is set to the position of the user's gaze point prior to the detected head movement. The text is then preferably reflowed within the resized text area. Optionally, the user may be prompted to confirm whether the resizing will be performed.