The research is important because it presents an innovative online tool for carbohydrate 3D structure validation, which is a staple of the structure-solution pipeline. The Privateer web app allows structural biologists to analyze carbohydrate ligands and protein glycosylation from a web browser while retaining all confidential information on their devices. Key Takeaways: 1. The Privateer web app is an innovative online tool for carbohydrate 3D structure validation. 2. The web app allows fast, local structure validation without the requirement to send any files to an external service. 3. Users can validate structural composition and conformation, anomericity, and linkage-torsion outliers from a web browser. 4. The Privateer web app is always up to date with the latest developments and fixes. 5. The web app is available at <https://privateer.york.ac.uk> and requires no installation.