A knot making device for quickly and efficiently tying a knot in a line. The device may be portable and capable of being secured to a stable surface such as a table or railing allowing for a user, such as an angler, to utilize the device while in the field. The device may comprise an extension arm having a loop holding assembly and a standing line holding assembly disposed at opposing ends of the extension arm. Both the loop holding assembly and the standing line holding assembly may further comprise a first and second tensioning member, respectively, for securely retaining the line. The device may further comprise a twist compactor element disposed along the extension arm and between the loop holding assembly and the standing line holding assembly. The twist compactor element may function to compress at least one twist present in the line while forming the knot.