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Key Takeaways
- Proofreading is the final quality check for grammar, spelling, punctuation, and formatting, done only after editing and revising are complete.
- Common errors caught during proofreading include article misuse, subject-verb agreement slips, incorrect hyphen, en dash, or em dash use, and apostrophe mistakes.
- AI tools such as Paperpal’s grammar checker catch surface-level errors fast, but a human proofreader still catches context, tone, and journal-specific issues that tools miss.
- Professional services such as Editage’s proofreading service also issue submission-ready certificates that many journals request before publication.
Contents
- What Is Proofreading?
- Proofreading vs. Editing vs. Revising vs. Copyediting: What Is the Difference?
- What Does a Proofreader Actually Do?
- Why Is Proofreading Important?
- When in the Publication Process Should You Proofread?
- Types of Proofreading
- Common Grammar and Style Errors Proofreaders Catch
- Proofreading Marks: A Quick Reference
- How Much Does Proofreading Cost?
- Can AI Tools Replace Human Proofreaders?
- Self-Proofreading Checklist for Researchers
- Proofreading Tips for PhD Students and Researchers
- Do You Need a Proofreading Certificate for Journal Submission?
- How to Choose a Proofreading Service
- Frequently Asked Questions
What Is Proofreading?
Proofreading is the final check of a written document for grammar, spelling, punctuation, and formatting errors before it is submitted or published. It is not rewriting; it is a technical check that catches small mistakes that survive editing and revising.
A proofreader typically checks for the items below.
- Spelling and typing errors
- Grammar and punctuation mistakes
- Consistency in spelling, capitalization, and terminology
- Reference and citation formatting
- Numbering, spacing, and layout errors
- Compliance with a journal’s or publisher’s style guide
The table below shows how small, easy-to-miss errors are corrected during proofreading.
| Original | Corrected | Error Type |
| The data shows a clear trend. | The data show a clear trend. | Subject-verb agreement |
| Results indicated significant difference. | The results indicated a significant difference. | Article usage |
| The studys results were conclusive. | The study’s results were conclusive. | Apostrophe |
| We tested 10 20 samples. | We tested 10-20 samples. | Hyphen in a range |
| This is a well known method. | This is a well-known method. | Hyphen in a compound word |
Proofreading vs. Editing vs. Revising vs. Copyediting: What Is the Difference?
Proofreading is the last, lightest step; copyediting improves sentence-level clarity; revising reshapes content and argument. Each stage has a different goal, and skipping one usually shows up as errors in the final draft.
| Aspect | Proofreading | Copyediting | Revising |
| Goal | Catch surface errors | Improve clarity and flow | Improve content and logic |
| Timing | Last step, pre-submission | Before proofreading | Before copyediting |
| Focus | Grammar, spelling, format | Sentences, word choice | Structure, argument |
| Typically done by | Proofreader or author | Editor | Author |
See also: Copyediting vs Proofreading: Key Differences
What Does a Proofreader Actually Do?
A proofreader reads a near-final document line by line to catch errors that editing left behind, then flags or corrects them using track changes or comments, without altering the author’s meaning or voice.
The Proofreading Workflow
Most professional proofreaders work in 3 passes, moving from meaning to mechanics to formatting.
- Pass 1: Read for overall meaning and flow to confirm nothing was lost during editing.
- Pass 2: Check grammar, punctuation, spelling, and word usage line by line.
- Pass 3: Verify formatting, headings, references, and compliance with the target style guide.
Many researchers run a draft through Paperpal’s grammar checker before Pass 1 to clear out obvious grammar and spelling issues, which speeds up the human proofreading passes that follow.
Why Is Proofreading Important?
Proofreading matters because reviewers and readers often judge the credibility of research by its language quality, even when the underlying science is sound. Frequent errors can distract from an argument, slow down peer review, or trigger a desk rejection before the content is even evaluated.
For non-native English researchers in particular, careful proofreading levels the playing field, since it separates a paper’s scientific merit from small language slips that have nothing to do with the quality of the research.
When in the Publication Process Should You Proofread?
Proofread only after editing and revising are complete, ideally right before submission and again after any reviewer-requested changes, since new errors often appear during last-minute edits.
- After the final content draft, once structure and arguments are locked
- Right before initial journal or publisher submission
- After incorporating peer review or editor feedback
- After typesetting, when the publisher sends page proofs for final approval
Types of Proofreading
Different documents call for different proofreading priorities, though the core skills stay the same.
- Academic proofreading: focuses on discipline-specific terminology, citation style, and journal formatting rules.
- Business proofreading: checks tone, branding consistency, and factual accuracy in reports or marketing copy.
- Translation proofreading: compares the translated text against the source to catch mistranslation, not just surface errors.
- Legal proofreading: verifies precise terminology, numbering, and clause references, since a single error can change meaning.
- Medical and pharma proofreading: checks drug names, dosages, units, and regulatory terminology against strict conventions.
- Literary proofreading: preserves the author’s voice and style while fixing mechanical errors.
Common Grammar and Style Errors Proofreaders Catch
A handful of grammar and style issues account for most of the corrections in academic manuscripts. Understanding them helps you self-edit before a proofreader or an editing service ever sees your draft.
Article Usage: A, An, and The
Article errors are among the most common issues for non-native English writers, since many languages do not use articles the same way English does. Use “a” or “an” for a non-specific, singular, countable noun, and “the” for something specific or already mentioned. For example: “a significant finding” versus “the significant finding discussed in Section 2.”
Subject-Verb Agreement
The verb must agree in number with its subject, which gets tricky with collective nouns and Latin-origin words. In formal academic writing, “data” is typically treated as plural, so “the data show” is preferred over “the data shows.” Watch for long subjects, where the verb can mistakenly agree with a nearby noun instead of the true subject.
Colons vs. Semicolons
A colon introduces a list, explanation, or elaboration that follows a complete sentence, as in: “The study had 1 limitation: a small sample size.” A semicolon joins 2 closely related independent clauses, or separates items in a complex list that already contains commas.
Hyphens, En Dashes, and Em Dashes
These 3 marks look similar but serve different purposes, and mixing them up is a common formatting error in manuscripts.
| Character | Name | Common Use |
| – | Hyphen | Joins compound words (well-known) and numerical ranges (10-15%) |
| – | En dash | Connects related items of equal weight, such as page ranges (pp. 12–18) or score pairs (3–2) |
| — | Em dash | Sets off a strong parenthetical clause or emphasis in informal or narrative writing |
Academic style guides generally prefer commas, colons, or semicolons over em dashes for formal scientific writing, so many journals ask authors to minimize em dash use in manuscripts.
Apostrophes
Apostrophes show possession or mark a contraction, but they should never be used to form a plural. Write “the results’ significance” for possession, “it’s” only as a contraction of “it is,” and “1990s” without an apostrophe for a decade.
British English vs. American English
Journals expect 1 consistent English variant throughout a manuscript, and mixing British and American conventions is a frequent proofreading flag.
| Category | British English | American English |
| Spelling | colour, organise, analyse | color, organize, analyze |
| Punctuation with quotes | Single quotes as default | Double quotes as default |
| Terminology | dissertation (doctoral) | dissertation or thesis (varies by institution) |
| Date format | Day, month, year (9 July 2026) | Month, day, year (July 9, 2026) |
Tools such as Paperpal’s grammar checker let you select US or UK English before checking a draft, which helps keep spelling and punctuation consistent across a long manuscript.
Proofreading Marks: A Quick Reference
Traditional proofreading marks are less common now that most proofreading happens on screen using track changes, but they still appear on printed manuscripts and page proofs.
| Mark | Meaning |
| Delete (strike-through with a loop) | Remove the marked text |
| Caret (^) | Insert the text written above |
| Transposition symbol | Swap the order of 2 letters or words |
| Paragraph mark | Start a new paragraph here |
| Close-up mark | Remove extra space between characters or words |
| 3 underlines | Capitalize the marked letter |
| Slash through a capital letter | Change to lowercase |
| Circle around an abbreviation | Spell the term out in full |
How Much Does Proofreading Cost?
Proofreading typically costs less than full editing, since it involves 1 lighter pass rather than sentence-level rewriting. Exact rates vary by provider, subject complexity, and turnaround speed, so treat the ranges below as general industry guidance rather than a fixed quote.
| Service Level | Typical Turnaround | Approximate Price Range |
| Standard proofreading | 5-7 days | Lower end of per-word rates |
| Express proofreading | 1-2 days | Mid to upper per-word rates, with a rush fee |
| Premium proofreading with certificate | 3-5 days | Upper per-word rates, includes a certificate |
For an exact quote based on word count, subject area, and deadline, you can request a sample or price estimate directly from Editage’s proofreading service.
Can AI Tools Replace Human Proofreaders?
No, not fully. AI grammar tools are excellent at catching mechanical errors quickly, but they still miss context, tone, discipline-specific terminology, and journal-specific judgment calls that experienced human proofreaders handle well.
AI tools are strong at:
- Spelling, punctuation, and basic grammar checks
- Consistency checks across a long document
- Fast, low-cost first-pass corrections
- Flagging passive voice or overly long sentences
Human proofreaders are still stronger at:
- Judging whether a sentence’s meaning matches the author’s intent
- Applying discipline-specific or journal-specific conventions
- Catching subtle logic or consistency issues across sections
- Making judgment calls where grammar rules genuinely conflict
For researchers, Paperpal’s grammar checker is built specifically for academic English, which makes it a stronger first-pass option than general-purpose grammar tools before a manuscript goes to a human proofreader.
Self-Proofreading Checklist for Researchers
Use this checklist for a final pass before submission.
- Run the draft through Paperpal’s grammar checker for a fast first-pass cleanup.
- Read the document aloud to catch awkward phrasing
- Check article usage (a, an, the) throughout
- Confirm subject-verb agreement, especially with collective nouns
- Verify consistent use of British or American English
- Check hyphen, en dash, and em dash usage
- Review apostrophe use for possessives and contractions
- Confirm colon and semicolon use in complex sentences
- Check reference formatting against the target style guide
- Print the document or change the font to catch errors missed on screen
See also: Proofreading for PhD students
Proofreading Tips for PhD Students and Researchers
- Take a break of at least a few hours between writing and proofreading
- Proofread in short sessions rather than 1 long sitting, since fatigue causes missed errors
- Read the document backward, sentence by sentence, to focus on mechanics instead of meaning
- Ask a lab mate or colleague to read for clarity, not just correctness
- Keep a personal list of errors you make often, and check for them specifically
- For high-stakes submissions such as a thesis or a journal article, consider a professional proofreading service for an objective final check
See also: Role of Proofreading in Academic Writing
Do You Need a Proofreading Certificate for Journal Submission?
Some journals request a certificate of English editing, especially from authors who are not native English speakers, as evidence that the manuscript has been professionally checked for language quality before review.
A certificate typically confirms:
- That the manuscript was proofread by a qualified, subject-familiar proofreader
- The date the proofreading was completed
- That grammar, spelling, and punctuation were checked throughout the document
Not every journal requires a certificate, so check submission guidelines first. If one is needed, Editage’s proofreading service issues a certificate on completion, which can be submitted alongside the manuscript.
How to Choose a Proofreading Service
Not all proofreading services are equal, especially for academic or technical content. Consider the factors below before choosing one.
- Subject expertise: proofreaders familiar with your field catch terminology errors that generalists miss.
- Native or near-native English proficiency: essential for catching subtle usage issues.
- Turnaround time: confirm the service can meet your submission deadline.
- Certificate availability: useful if your target journal requires one.
- Transparent pricing: look for clear per-word or per-page rates with no hidden fees.
- Revision policy: check whether a follow-up round is included if you have questions.
Services such as Editage’s proofreading service combine subject-matter experts with journal-specific formatting checks, which is useful when a manuscript needs to meet a particular publisher’s requirements.
Frequently Asked Questions
How long does proofreading take for a research paper?
Standard proofreading usually takes 5-7 days for an average manuscript, while express services can return a paper in 1-2 days for an additional fee. Turnaround depends on word count and subject complexity.
Is proofreading the same as copyediting?
No. Proofreading is a lighter, final check for grammar, spelling, and formatting, while copyediting is a deeper pass that improves sentence structure, word choice, and clarity before proofreading begins.
Can Grammarly or other AI tools replace a human proofreader for academic papers?
Not fully. AI tools catch mechanical errors quickly and cheaply, but they miss discipline-specific terminology, tone, and journal-specific conventions that a trained human proofreader handles more reliably.
How much does it cost to proofread a 5,000-word manuscript?
Cost depends on turnaround speed and subject complexity, with standard turnaround priced lower than express or premium options. Request a quote from your chosen service based on exact word count.
Do journals require a certificate of English editing?
Some do, particularly for authors who are not native English speakers, while others do not require one at all. Always check the specific journal’s author guidelines before submission.
What is the difference between British and American English in academic writing?
The main differences are spelling (colour versus color), some terminology, and date formats. Journals expect 1 consistent variant throughout a manuscript, so mixing the 2 is a common proofreading flag.
Should I proofread before or after peer review?
Proofread before initial submission, and again after incorporating peer review or editor feedback, since new errors are often introduced during last-minute revisions.
What is a good tool to check grammar before submitting a research paper?
Academic-focused tools built for scholarly English, such as Paperpal’s grammar checker, tend to outperform general-purpose grammar tools for research writing, since they account for academic tone and conventions.
This article was originally published on May 9, 2024, and updated on July 9, 2026.
