Key takeaways
- Self-plagiarism is reusing your prior work without disclosure—it is not a free pass because you wrote it.
- Universities and journals require transparency when material has appeared elsewhere.
- Thesis-by-publication models have specific rules for reuse.
Many students assume that because they wrote something before, they can paste it into a new submission freely. Universities and journals disagree. Self-plagiarism is a recognised form of academic misconduct, though the rules depend on context.
What self-plagiarism means
Self-plagiarism occurs when you reuse substantial portions of your previously published or submitted work in a new document without acknowledging the prior use. Turnitin will flag it because the text matches your earlier submission in its database.
What universities typically allow
- Reusing your own published papers as thesis chapters—with supervisor approval and proper citation.
- Recycling methodological descriptions across related projects with disclosure.
- Building on your conference paper in an expanded journal article with clear development.
What is not allowed
Submitting the same assignment twice, copying a previous essay into a new course without permission, or publishing nearly identical papers in different journals without cross-reference.
How to reuse your work correctly
- 1Tell your supervisor before reusing prior material.
- 2Cite your earlier work as you would any other source.
- 3Rewrite and expand rather than copy-paste when the context differs.
- 4Check journal policies on prior publication and preprints.