Gitnotate is a free Chrome extension designed to improve the commenting experience in GitHub Pull Requests (PRs) by enabling sub-line commenting for Markdown files. Unlike GitHub's standard review tools that only allow comments on entire lines, Gitnotate allows users to highlight specific words or phrases, making it easier to address typos, formatting issues, or specific word choices directly in the diff view. This feature is particularly beneficial for reviewing documentation, README files, and changelogs where precision is essential.

The extension captures the exact text selection within a PR diff, embedding this information into the comment for clarity. Submitted comments are visually enhanced with color-coded highlights, allowing users to easily identify feedback related to specific text. Gitnotate also ensures that comments remain accessible to users without the extension, maintaining a seamless experience across the board. With a focus on privacy, the extension operates entirely within the user's browser without data tracking or external communication.