Rambler is a desktop client based on LLM technology that supports the extraction of key points and macro editing of spoken text through a graphical user interface. It features two main functions: key point extraction and macro editing. It can generate keywords and abstracts, support review and interaction of spoken text, and utilizes LLM-assisted macro editing to allow users to rephrase, split, merge, and convert documents without specifying specific editing locations. Rambler excels in processing spoken text, helping users to better engage in oral expression and editing, bridging the gap between spoken language and structured writing. In a comparative study with 12 participants on oral composition tasks, Rambler outperformed the baseline of speech-to-text editor + ChatGPT because it better facilitated user iteration and revision, while supporting diverse user strategies.