LTRsift is a graphical desktop tool for semi-automatic postprocessing of de novo predicted LTR retrotransposon annotations, such as the ones generated by LTRharvest and LTRdigest. Its user-friendly interface displays LTR retrotransposon candidates, their putative families and their internal structure in a hierarchical fashion, allowing the user to "sift" through the sometimes large results of de novo prediction software. It also offers customizable filtering and classification functionality.