Attending to peripheral visual targets while maintaining central fixation, a process that involves covert attention, reduces fixation stability . Here, we tested the hypothesis that changes in fixation stability induced by peripheral viewing contribute to crowding in peripheral vision by increasing positional uncertainty . We first assessed whether fixation was less stable during peripheral versus central (foveal) viewing for both crowded and uncrowded stimuli . We then tested whether fixation stability during peripheral viewing was associated with the extent of crowding . Fourteen participants performed a tumbling E orientation discrimination task at three different eccentricities (0° , 5° , 10°). The target was presented with or without flankers . Fixational eye movements were measured using an infrared video-based eyetracker . A central fixation cross was provided for the two peripheral viewing conditions, and optotype size was scaled for each eccentricity . Discrimination of appropriately scaled uncrowded stimuli was unaffected by eccentricity, whereas discrimination of crowded stimuli deteriorated dramatically with eccentricity, despite scaling . Both crowded and uncrowded peripheral stimuli were associated with reduced fixation stability, increased microsaccadic amplitude, and a greater proportion of horizontal microsaccades relative to centrally presented stimuli . However, these effects were not associated with the magnitude of crowding . This suggests that reduced fixation stability due to peripheral viewing does not contribute to crowding in peripheral vision.