Uses 'ggplot2' to visualise either (a) a single DNA/RNA sequence split across multiple lines, (b) multiple DNA/RNA sequences, each occupying a whole line, or (c) base modifications such as DNA methylation called by modified bases models in Dorado or Guppy. Functions starting with visualise_<>() are the main plotting functions, and functions starting with extract_and_sort_<>() are key helper functions for reading files and reformatting data. Source code is available at < https://github.com/ejade42/ggDNAvis>, a full non-expert user guide is available at < https://ejade42.github.io/ggDNAvis/>, and an interactive web-app version of the software is available at < https://ejade42.github.io/ggDNAvis/articles/interactive_app.html>.