• • The solid-state hot-pressing method synthesizes COFs in 0.5–5 minutes, a drastic reduction from conventional solvothermal times (hours to days), enabling rapid production and energy savings.
• • The method produces self-standing COF platelets with high crystallinity and porosity, eliminating the need for post-synthetic shaping and facilitating direct use in flow adsorption and catalysis.
• • The approach is broadly applicable, successfully synthesizing 15 distinct COFs, including imine-, hydrazone-, β-ketoenamine-, and imide-linked frameworks, a 3D COF (COF-300), and a mixed-monomer COF, demonstrating versatility across linkage chemistries.
• • A large free-standing COF platelet of 200 cm² (10 cm × 20 cm) was fabricated, demonstrating potential for scaled-up production and industrial implementation.