A screenshot often has one useful region surrounded by menus, empty space, or unrelated messages. Reducing the entire image can make the important text smaller without helping the reader. First decide what needs to be shared. If appropriate, crop the screenshot in your device's editor before bringing it here, while keeping enough context that the content is not misleading.
This page starts with PNG at the original dimensions, no crop, and sharpening off. That is a cautious starting point for text and interface edges. It does not guarantee a smaller PNG than the source. Screenshots are often already efficiently stored, and a canvas export can be similar in size or larger. Compare a change only when it serves a real sharing need.
Check visible personal information before sending. Names, account details, browser tabs, notifications, or private messages can appear outside the region you intended to show. This compressor is not a secure redaction tool. Use an appropriate editor to remove sensitive information permanently, then inspect the saved result carefully. A crop or black rectangle should not be assumed to solve every privacy problem without reviewing the actual file.