GitHub PR Review: Best Practices and Tools (2026)

Why GitHub PR review matters Pull request review is the last checkpoint before code enters your main branch. Every bug, security vulnerability, and design flaw that survives the review process has a direct path to production. GitHub is where the vast majority of this review happens - over 100 million developers use the platform, and pull requests are the standard mechanism for proposing, discussing, and merging changes across nearly every team that ships software. The impact of effective PR review is well-documented. Google's engineering practices research found that code review is the single most effective method for catching defects in software, outperforming testing and static analysis when measured independently. Microsoft's studies showed that reviewed code had 20-30% fewer defects reaching production compared to unreviewed code of equivalent complexity. SmartBear's analysis of 2,500 code reviews across multiple organizations revealed that reviews caught 60-90% of defects before t