Why Researchers Should Engage in Paraphrasing Services to Reduce Plagiarism: Ensuring Originality and Academic Integrity

I remember the first time I ran my thesis chapter through Turnitin. I expected maybe 5%. I got 31%.

My stomach dropped. I had not copied anything. I had not stolen anyone’s work. But there it was, a third of my text highlighted in red, matching sources I had cited properly and sections from my own published conference paper.

That was when I learned that Turnitin does not care about intent. It does not know whether you plagiarized on purpose, paraphrased poorly, or just happened to describe a methodology the same way everyone else does. It sees a match. It flags it. And then you have a problem.

This post is about how to fix that problem. Not by gaming the system, but by actually learning how to paraphrase properly so your similarity score reflects what it should: that your work is genuinely your own.

What a Turnitin Similarity Score Actually Measures

Before we talk about fixing it, let me clear up a common misunderstanding.

Your Turnitin similarity score is not a plagiarism score. Turnitin does not decide whether you plagiarized. It tells you what percentage of your text matches other documents in its database. That database includes published papers, theses from other universities, websites, and books.

A 25% similarity score means that a quarter of your text overlaps with existing sources. Some of that might be direct quotes you cited properly. Some might be common phrases that everyone in your field uses. Some might be your own previously published work. And yes, some might be sections where your paraphrasing was not different enough from the original.

The score itself is not the issue. The issue is what is behind the score. A 20% score where most of the matches are properly cited direct quotes is fine. A 12% score where the matches are all unattributed close paraphrases is a serious problem.

Most journals want your similarity score below 15 to 20%. Some are stricter and want below 10%. Your university may have its own threshold. Whatever the number is, you need to know it before you submit, because finding out after a rejection is much more stressful than fixing it beforehand.

Why Your Literature Review Is Probably the Biggest Problem

If you have a high similarity score, I can almost guarantee that most of the matches come from your literature review.

This makes sense when you think about it. In a literature review, you are summarizing other people’s research. You are describing their methods, their findings, their theoretical frameworks. And when you read a sentence like “The Technology Acceptance Model posits that perceived usefulness and perceived ease of use are the primary determinants of technology adoption,” it is very hard to say the same thing in completely different words. Because that is just what the model says.

The result is that many researchers end up writing literature reviews that stay too close to the original source material. Not because they are trying to steal anything. Because the content itself is borrowed, and it is genuinely difficult to rephrase it without losing accuracy.

This is the core challenge of academic paraphrasing. You need to express someone else’s idea in your own words, with your own sentence structure, while keeping the meaning exactly the same and citing the original source properly. That is harder than it sounds.

What Academic Paraphrasing Actually Means (It Is Not Synonym Swapping)

Let me be direct about this because I see it constantly: replacing individual words with synonyms is not paraphrasing.

If the original says “The study revealed a significant correlation between income levels and educational attainment” and you write “The research showed a notable relationship between earnings and academic achievement,” you have not paraphrased. You have synonym-swapped. The sentence structure is identical. The logic flows the same way. Turnitin will flag it because it is, structurally, the same sentence wearing a different outfit.

Real paraphrasing means changing the structure of the idea. You break it apart. You reorganize it. You approach it from a different angle.

The same finding, properly paraphrased, might look like this: “Higher income was found to predict stronger educational outcomes, with the correlation reaching statistical significance (Author, Year).” Notice what changed. The subject is different. The sentence structure is different. The emphasis is different. But the meaning is the same and the source is cited.

Or you could go further and integrate it into your own argument: “These findings are consistent with earlier work showing that socioeconomic factors, particularly income, play a measurable role in shaping educational trajectories (Author, Year).” Now you have not just paraphrased. You have synthesized. You have placed the finding in context. That is what good academic writing looks like, and it is what keeps your similarity score low.

Self-Plagiarism: The Problem Nobody Warns You About

Here is something that catches a lot of postgrads off guard. You can plagiarize yourself.

If you published a conference paper and now you are expanding it into a journal article, you cannot just copy your own methodology and results sections into the new manuscript. Even though you wrote those words. Even though it is your own research. Turnitin will flag it because the text already exists in its database from the conference proceedings.

Self-plagiarism is a real issue and journals take it seriously. The expectation is that every new manuscript contains substantially new text, even when the underlying research builds on your earlier work. You need to rewrite your own previous descriptions in fresh language.

This is one of the most frustrating parts of academic writing. You described your methodology perfectly the first time. Now you have to describe the same methodology in completely different words for the new paper. It feels pointless. But it is the rule, and ignoring it will cause problems.

The practical solution is the same as with any other paraphrasing challenge: understand the content deeply, close the original document, and write the description from scratch using your own current phrasing. If it helps, pretend you are explaining the method to a colleague in person. Then write down what you said.

How to Reduce Your Turnitin Similarity Score Through Better Paraphrasing

Here are the specific techniques I use. These are not tricks. They are actual writing strategies that produce better text and lower similarity scores at the same time.

Read, close, write. This is the single most effective technique. Read the source passage. Close the source. Write the idea from memory in your own words. Then open the source again and check that you got the meaning right. If your version is still too close, repeat the process. The reason this works is that your memory does not store exact words. It stores meaning. So when you write from memory, you naturally use your own phrasing.

Change the sentence structure, not just the words. If the original starts with the subject, start with a prepositional phrase or a subordinate clause. If the original is one long sentence, break it into two short ones. If the original lists three things in order, present them in reverse order or lead with the most important one. Structural change is what Turnitin cannot match.

Combine multiple sources into one passage. Instead of paraphrasing Source A in one sentence and Source B in the next, blend them. “While Author A emphasizes the role of X, Author B argues that Y is equally important, and recent data from Author C supports this broader interpretation.” This kind of synthesis is much harder for Turnitin to match because the text draws from three sources simultaneously, and the structure is entirely yours.

Add your own analytical commentary. After paraphrasing a finding, add a sentence of your own interpretation. “This is particularly relevant to the current study because…” or “However, a limitation of this finding is that the sample did not include…” These interpretive sentences are 100% original because they come from your own thinking. They lower your overall similarity percentage and they make your writing better.

Use direct quotes strategically. Sometimes the original wording is so precise or so well-known that paraphrasing it would actually be worse. In those cases, use a direct quote with quotation marks and a page number. Turnitin still highlights it, but your examiner or reviewer can see immediately that it is a properly cited quote, not unattributed copying. A few well-placed direct quotes are perfectly acceptable. Twenty pages of them are not.

Rewrite your methodology section from scratch for each new paper. Do not copy and paste from your previous publications. Even if the method is identical, describe it fresh. Use different phrasing, different sentence order, maybe a slightly different level of detail. This is the most common source of self-plagiarism matches and the easiest to fix.

Check as you go, not just at the end. If you have access to Turnitin or a similar tool, run your manuscript through it after each major section is done. Fixing a few paragraphs at a time is much easier than trying to rewrite 30 flagged pages at the end when your deadline is two days away.

Why Free Paraphrasing Tools Make Things Worse

I know the temptation. You have a flagged paragraph. You paste it into QuillBot or one of those free paraphrasing tools. It gives you a rewritten version. Problem solved, right?

Not really. Here is what actually happens.

These tools use AI to rephrase your text. The output might reduce your Turnitin similarity score by a few percentage points. But the rephrased text now has AI-generated patterns. Low burstiness. Low perplexity. Generic word choices. So you have traded a plagiarism flag for an AI detection flag. You went from one problem to two problems.

On top of that, automated paraphrasing tools frequently change meaning. They replace a technical term with a word that sounds similar but means something slightly different. “Significant correlation” becomes “important connection.” Those are not the same thing in academic writing. A correlation has a specific statistical meaning. A connection does not. Your examiner will notice.

They also produce awkward, unnatural phrasing. “The participants were subjected to an intervention” becomes “The people were put through a procedure.” That is not how any academic writes. It reads like a bad translation, and it undermines the credibility of your work.

The only tool that reliably produces good paraphrased text is your own brain. Or, if you need help, a human editor who understands your field.

What Similarity Score Should You Actually Aim For

This depends on where you are submitting.

Most Scopus and Web of Science indexed journals expect a similarity score below 15 to 20%. Some strict journals in medicine and engineering want below 10%. If you are unsure, check the author guidelines. If the guidelines do not mention a threshold, below 15% is a safe target.

For thesis submissions, your university will have its own policy. I have seen thresholds ranging from 10% to 30% depending on the institution and department. Ask your supervisor or your graduate school office. Do not guess.

Keep in mind that some similarity is normal and expected. Direct quotes, common phrases, reference lists, and standard terminology will always generate some matches. A score of 3% is not necessarily better than a score of 12%. What matters is that the matches are legitimate and properly cited, not that the number is as low as possible.

If your score is above your target threshold and the matches are coming from poorly paraphrased passages, that is what needs fixing. Focus on the sections with the highest match percentages and rewrite those first. You will usually find that fixing the top five or six flagged passages brings your overall score down dramatically.

When Professional Paraphrasing Help Makes Sense

Self-paraphrasing works. But it takes time, and it takes a certain confidence with English that not every researcher has.

If English is not your first language, paraphrasing is doubly hard. You are trying to express someone else’s idea in your own words, but your “own words” in English are more limited than in your native language. The result is that your paraphrased versions often stay too close to the original, not because you are lazy, but because you do not have enough alternative phrasings to draw from.

If you are building on your own prior work and need to rewrite sections to avoid self-plagiarism, professional help can save you days of frustrating rewriting.

If you are facing a submission deadline and your score is too high, you do not have time to slowly work through every flagged paragraph yourself.

In any of these situations, a professional academic paraphrasing service is a practical investment. The editor reads your flagged sections, understands the academic content, and rewrites each passage in fresh language while keeping the meaning intact. The result is text that is original, natural, and accurately represents the source material.

PM Proofreading’s paraphrasing service is done entirely by human editors. No AI tools, no spinners. You can also order a Turnitin similarity report before and after paraphrasing so you can see the exact improvement. Many researchers combine paraphrasing with proofreading and editing to polish the full manuscript at the same time.

Need to reduce your similarity score before submission? Upload your manuscript and get a quote. Paraphrasing is priced at US$7.50 per 500 words. Turnitin reports available at US$8 each.

Is It Ethical to Use a Paraphrasing Service for Academic Work?

Yes. And this is not a grey area.

Professional paraphrasing is a form of editing. You are not asking someone to write your thesis for you. You are asking them to help you express existing cited ideas in language that is sufficiently different from the original source. The content, the citations, the analysis, and the conclusions remain entirely yours.

This is no different from hiring an editor to fix your grammar or improve your sentence structure. It is standard practice in academic publishing. Journals expect polished manuscripts, and using professional services to achieve that is accepted by every major publisher.

The line is the same as always: the thinking must be yours. The expression can be professionally improved.

Conclusion

A high similarity score is not a moral failing. It is a writing problem. And writing problems have writing solutions.

The core of those solutions is real paraphrasing. Not synonym swapping. Not running your text through a free tool and hoping for the best. Actually reading a source, understanding what it says, closing it, and writing the idea in your own words with your own structure.

It takes practice. The first few times you do it, it will feel slow and unnatural. But it gets easier. And once you develop the habit, your writing improves across the board. Better paraphrasing makes better literature reviews. Better literature reviews make better manuscripts. Better manuscripts get published.

If you need help getting there, especially if English is your second language or your deadline is close, professional paraphrasing can bridge the gap. But either way, the goal is the same: text that is genuinely yours, properly cited, and ready for submission.

PM Proofreading offers professional academic paraphrasing, AI humanizing, and proofreading and editing for international researchers. Every editing order includes a free language editing certificate. Upload your manuscript and get a quote today.

Frequently Asked Questions

What is an acceptable Turnitin similarity score for journal submission?

Most Scopus and Web of Science indexed journals expect a similarity score below 15 to 20%. Some journals in medicine and engineering require below 10%. If the author guidelines do not specify a threshold, aiming below 15% is a safe target. Keep in mind that some similarity is normal. Properly cited direct quotes, reference lists, and standard disciplinary terminology will always generate some matches. What matters is that the flagged content is properly attributed, not that the score is zero.

Is paraphrasing the same as plagiarism?

No. Paraphrasing is the opposite of plagiarism. It means expressing someone else’s idea in your own words with proper citation. Plagiarism is presenting someone else’s words or ideas as your own without attribution. The key distinction is citation and genuine rewording. If you cite the source and write the idea in substantially different language with a different sentence structure, that is good academic practice. If you stay too close to the original wording or fail to cite, that is a problem.

Can I plagiarize my own work?

Yes. Self-plagiarism occurs when you reuse text from your own previously published work without sufficient rewriting. If you published a conference paper and copy sections into a new journal manuscript, Turnitin will flag the overlap because the original text already exists in its database. Journals expect substantially new text in every submission, even when the underlying research builds on your prior work. The solution is to rewrite your own previous sections in fresh language while citing the earlier publication where appropriate.

Do free paraphrasing tools actually reduce similarity scores?

They might reduce your similarity score by a few percentage points, but they create new problems. Free paraphrasing tools use AI to rephrase text, which means the output has AI-generated patterns that can trigger AI detection flags. They also frequently change technical meanings, produce awkward phrasing, and generate text that does not read like natural academic writing. The most reliable way to reduce your similarity score is manual paraphrasing by yourself or a professional human editor.