We are introducing Pep McConst—a software that employs a Monte‐Carlo algorithm to construct 3D structures of polypeptide chains which could subsequently be studied as stand‐alone macromolecules or complement the structure of known proteins. Using an approach to avoid steric clashes, Pep McConst allows to create multiple structures for a predefined primary sequence of amino acids. These structures could then effectively be used for further structural analysis and investigations. The article introduces the algorithm and describes its user‐friendly approach that was made possible through the VIKING online platform. Finally, the manuscript provides several highlight examples where Pep McConst was used to predict the structure of the C‐terminal of a known protein, generate a missing bit of already crystallized protein structures and simply generate short polypeptide chains.