This article outlines tools and standards used in animal welfare audits for broiler chickens. These audits assess whether farms, hatcheries, or processing plants meet animal welfare certification standards, which may be company-specific or part of nationally recognized certification programs. The audits are performed to evaluate resource-based inputs (housing, handling, veterinary care) and animal-based indicators (health, behavior, emotional states) to assess overall animal welfare. Here we show examples of prominent U.S. broiler welfare certification programs, their associated audit tools, animal welfare indicators used during audits, and compliance thresholds.