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Academy · Research Writing · Proofreading and copyediting
The same passage, marked both ways
Definitions of proofreading and copyediting are easy to read and hard to use, because they describe intent rather than output. One paragraph marked both ways settles it in a way a price list cannot.
The passage
A methods paragraph from a submitted observational study, used with the author’s permission and with the setting changed.
As submitted
Patients was recruited from three centres between Jan 2023 and December 2024. Inclusion criterias were age over 18 and a confirmed diagnosis. Patients with incomplete data were excluded from the analysis. The primary outcome was change in score at 12 weeks, secondary outcomes were also measured. Statistical analysis was performed using standard methods and a p value of less than 0.05 was considered significant.
Proofread
A proofreader corrects what is wrong on the page. Grammar, spelling, agreement, consistency of format. They do not question what the sentence claims.
After a proofread
Patients were recruited from three centres between January 2023 and December 2024. Inclusion criteria were age over 18 years and a confirmed diagnosis. Patients with incomplete data were excluded from the analysis. The primary outcome was change in score at 12 weeks; secondary outcomes were also measured. Statistical analysis was performed using standard methods, and a p value of less than 0.05 was considered significant.
Six corrections. The paragraph is now clean, and every problem that would cause a reviewer to send it back is still in it.
Copyedited
A copyeditor reads for what the sentence has to do. Here the paragraph is a methods section, so it has to be reproducible — and in four places it is not.
After a copyedit, with queries
Patients were recruited from three centres between January 2023 and December 2024. Inclusion criteria were age 18 years or older and a confirmed diagnosis of [condition — please specify, and state the diagnostic criteria applied]. Patients with incomplete data were excluded [how much missing data led to exclusion, and how many patients were excluded? A flow diagram is expected under STROBE 2 item 13]. The primary outcome was change in [named instrument] score at 12 weeks. Secondary outcomes were [please list; “also measured” does not allow a reader to judge multiplicity]. Analyses were performed using [software and version]; a two-sided p value below 0.05 was considered statistically significant [was any adjustment made for multiple comparisons?].
What the difference actually is
The proofread produced a correct paragraph. The copyedit produced a paragraph that cannot be finished without the author supplying five facts — and those five facts are the ones a reviewer would have demanded three months later.
The distinction in one line
A proofreader asks whether the sentence is right. A copyeditor asks whether the sentence is enough. Neither writes the missing content, but only one of them notices it is missing.
Note what the copyeditor did not do. They did not invent the condition, name the instrument, or decide whether an adjustment was needed. Those are the author’s facts, and supplying them would be fabrication dressed as helpfulness.
Which one your document needs
- Proofread a document whose content is settled and whose structure has already been reviewed — a final thesis after supervisor sign-off, an accepted manuscript at proof stage, a report that has been through its own review.
- Copyedit anything going to a gatekeeper for the first time: a manuscript before submission, a grant application, a regulatory document, a thesis before it reaches the examiner.
- Neither, yet, where the argument itself is unsettled. Editing a paragraph that is about to be deleted is the most common way to pay twice.
The single most expensive mistake is buying a proofread for a document that has never been copyedited, because the result is a clean file with all its substantive problems intact — and it will look finished, which means nobody looks again.
Take-home message for authors and researchers
- A proofreader asks whether the sentence is right. A copyeditor asks whether it is enough.
- For anything going to a gatekeeper for the first time, buy the copyedit.
- The most expensive mistake is proofreading a document that was never copyedited: it looks finished, so nobody looks again.
Common questions
Copyediting, for anything going to a reviewer, examiner or assessor. A clean document with a missing method fails; a slightly rough document with a complete method usually does not.
It should include checking that citations in the text match the list and that the list is internally consistent in style. Verifying that each reference says what the sentence claims is a separate check and worth asking about explicitly.
A good one queries rather than changes when meaning is at stake, which is why a copyedited file comes back with comments rather than only tracked changes. If the queries are answered by someone other than the author, that is where meaning gets lost.
Providers use the terms differently, which is the reason this article exists. Ask what the pass changes rather than what it is called — specifically, whether it questions whether a claim is supported.
Yes, after you have answered the queries and made the changes. Every edit introduces the possibility of a new error, so the last pass has to happen after the last change.
References and sources
- Chartered Institute of Editing and Proofreading, guidance on editorial levels. read 11 September 2026. www.ciep.uk
- STROBE statement, checklist for observational studies. read 11 September 2026. www.strobe-statement.org
Each source carries the date it was last read. Where a standard moves, this article is revised rather than left up with a note.
How to cite this article
Pick your referencing style and copy it. Your university or target journal may vary the punctuation — check its guide if it has one.
Pubrica Academy. (2026, April 2). The same passage, marked both ways. Pubrica. https://pubrica.com/insights/proofreading-vs-copyediting/
Pubrica Academy. “The Same Passage, Marked Both Ways.” Pubrica, 2 Apr. 2026, pubrica.com/insights/proofreading-vs-copyediting/.
Pubrica Academy (2026) The same passage, marked both ways. Pubrica. Available at: https://pubrica.com/insights/proofreading-vs-copyediting/ (Accessed: 15 October 2026).
Pubrica Academy. “The Same Passage, Marked Both Ways.” Pubrica. April 2, 2026. https://pubrica.com/insights/proofreading-vs-copyediting/
Pubrica Academy, ‘The same passage, marked both ways’ (Pubrica, 2 April 2026) <https://pubrica.com/insights/proofreading-vs-copyediting/> accessed 15 October 2026.
Pubrica Academy. The same passage, marked both ways. [Internet]. Pubrica; 2026 Apr 2 [cited 2026 Oct 15]. Available from: https://pubrica.com/insights/proofreading-vs-copyediting/
Pubrica Academy, “The same passage, marked both ways,” Pubrica, Apr. 2, 2026. [Online]. Available: https://pubrica.com/insights/proofreading-vs-copyediting/
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author = {{Pubrica Academy}},
title = {The same passage, marked both ways},
howpublished = {Pubrica},
year = {2026},
month = {apr},
url = {https://pubrica.com/insights/proofreading-vs-copyediting/},
note = {Accessed: <span data-cite-acc="iso">2026-10-15</span>}
}This article is written to be learned from. Cite it if you are referring to what it says; if you are using the evidence behind it, cite the sources listed above instead.
Pubrica AcademyWritten and maintained by the subject matter experts of Pubrica who do this work. Articles are revised when the standard underneath them moves, and each one carries the date it was last checked.
How Pubrica helps
Proofreading will mark 1,000 of your own words both ways at no charge, which settles the question on your document rather than ours. Editing and translation sets out what each rung changes; for a manuscript, the copyedit includes a pass against the reporting checklist your design requires.