Bamboo fibres are currently an option to reduce the use of wood fibres as paper material. This study aims to integrate bamboo fibres and activated carbon as a paper matrix and analyse its microscopic characteristic. Activated carbon were mixed in a paper matrix made of bamboo fibres. Microscopic analysis was carried out to determine the effect of activated carbon addition to the paper pores. Pore size is known as a determinant of the physical properties of paper in its use for various purposes. Microscopic analysis using a scanning electron microscope and Brunauer–Emmett–Teller (BET) showed that the addition of activated carbon had an effect on the pore size, microspore volume and surface area. The ratio of activated carbon and fibres of 1:1 revealed the largest surface area with a microspore volume of 0.04 g/cm3 and the smallest average pore size of about 6 nm. The larger ratio of activated carbon to fibres decreased the surface area significantly with an increase in microspore volume and pore size.