Make your text more concise by tightening phrases and removing repetition. Light aims for a gentle reduction; More concise makes a stronger cut while prioritizing substantive facts.
Shorten is useful for emails, explanations, and drafts with repeated phrases. Some texts are already compact, so a faithful version may need more words than the requested reduction.
Use Summarize for an overview that selects information. Shorten aims to keep conditions, names, dates, and important qualifications in the rewritten text.