Most patient information is stored only in the form of transcribed, dictated notes. CHARTextract is a rule-based information extraction tool with the ability to quickly and easily refine rules on-the-fly. By combining physician knowledge and keyword-based pattern matching, we can extract patient attributes (e.g., diagnosis, country of birth, procedures, etc.) from free-form text notes. With this tool, hospital leadership, clinicians and clinical researchers everywhere can automatically extract patient information from text notes and perform large-scale analyses of patient data. The tool, as well as pre-existing rulesets, are available for download.