**Dnaapler: A Tool to Reorient Circular Microbial Genomes** The study introduces Dnaapler, a flexible tool designed to reorient circular microbial genomes, such as those of bacteria, plasmids, and bacteriophages. The tool addresses the issue of arbitrary start points in circular genome sequences, which can affect downstream analysis and annotation. Dnaapler is a lightweight command-line tool written in Python, requiring only a FASTA formatted genome file as input. It uses BLAST or Pyrodigal for reorientation, depending on the chosen subcommand. Dnaapler can search for specific genes like dnaA, repA, and terL to identify the correct starting point for reorientation. The tool is available on PyPI and Bioconda, with continuous integration and deployment through GitHub actions. Examples of Dnaapler's functionality are provided using the C333 *Staphylococcus aureus* chromosome and the C333 Sa3int prophage, demonstrating its effectiveness in reorienting genomes accurately.**Dnaapler: A Tool to Reorient Circular Microbial Genomes** The study introduces Dnaapler, a flexible tool designed to reorient circular microbial genomes, such as those of bacteria, plasmids, and bacteriophages. The tool addresses the issue of arbitrary start points in circular genome sequences, which can affect downstream analysis and annotation. Dnaapler is a lightweight command-line tool written in Python, requiring only a FASTA formatted genome file as input. It uses BLAST or Pyrodigal for reorientation, depending on the chosen subcommand. Dnaapler can search for specific genes like dnaA, repA, and terL to identify the correct starting point for reorientation. The tool is available on PyPI and Bioconda, with continuous integration and deployment through GitHub actions. Examples of Dnaapler's functionality are provided using the C333 *Staphylococcus aureus* chromosome and the C333 Sa3int prophage, demonstrating its effectiveness in reorienting genomes accurately.