Optical filters that block visible light but allow near-infrared radiation to pass through (VONIRT) are considered promising for applications in optical detection or information security. Extreme UV shielding, high NIR transmissionThrough π–π stacking, lignin forms J-shaped structures which, together with hydrogen bonds, ensure a dense filter structure. The result: almost complete blocking in the UV–visible range (transmission at 400 nm and 600 nm ~0%) with high NIR transmission (~80% at 1,400 nm). Initial applications show potential for NIR photography and optical information security. The process is catalyst-free, easy to implement and an example of sustainable, high-performance filters based on lignin.