UltraEdit is a large-scale image editing dataset comprising approximately 4 million automatically generated, instruction-based image editing samples. It leverages the creativity of large language models (LLMs) and the contextual editing examples provided by human evaluators, offering a systematic approach to produce large-scale and high-quality image editing samples. Key advantages of UltraEdit include: 1) **Wider Range of Editing Instructions:** It utilizes the creativity of LLMs and contextual editing examples from human evaluators to provide a broader spectrum of editing instructions. 2) **Diverse Data Source:** Its data source is based on real-world images, encompassing photographs and artwork, leading to increased diversity and reduced bias. 3) **Region-Based Editing Support:** Enhanced by high-quality, automatically generated region annotations, it supports region-based editing.