tszip is a command line interface and Python API for compressing tskit tree sequence files produced and read by software projects in the tskit ecosystem such as msprime, SLiM, fwdpy11 and tsinfer. Tszip achieves much better compression than is possible using generic compression utilities by building on the zarr and numcodecs packages.
$ tszip 1kg_chr20.trees
$ tsunzip 1kg_chr20.trees.tsz 
