Plagiarism Checker by JustDone
Paste your text, get a clear plagiarism score with every match linked to its source, and fix what needs fixing without leaving the page.
Used by Students and Academics from all over the world
Go beyond basic plagiarism check
See not just a score. Get a full breakdown of what was flagged, where it came from, and how to fix it.
Know exactly what's flagged
Every flagged sentence is highlighted and linked directly to the matching source. You see what was copied, what was paraphrased, and where it originally appeared.
Fix it without switching tools
Found a problem? Rewrite flagged sections directly in the editor. No copying text into another tab, no back-and-forth. Detection and revision happen in the same place.
Precise detection, smart exclusions
Properly cited quotes, bibliographies, and reference lists are automatically excluded from your plagiarism score. What you see reflects your original writing, not references.
How to use the Plagiarism Checker
Check for plagiarism on any essay, assignment, paper, or piece of content in three steps.
Add text
Paste your text directly into the editor or upload a file in PDF, TXT, or DOCX format. No reformatting required. The plagiarism checker tool accepts documents of any length, from a single paragraph to a full research thesis.
Run the check
JustDone compares your work against billions of sources: public web pages, academic journals, open-access research databases, and previously submitted student work. Your plagiarism score appears in minutes with a clear percentage showing how much of your text can be flagged.
Review and fix
Every flagged section has a direct link to the matching source. You can see exactly what was matched and where it came from. Rewrite flagged sections directly in JustDone, add missing citations, or use the built-in paraphrasing tool to rework passages that are too close to a source.
Want unlimited checks, full source reports, and one-click rewriting? Explore JustDone premium plans
More than a plagiarism score
Most plagiarism checkers give you a number and leave you to figure out the rest. JustDone gives you a score, the sources behind it, and the tools to fix what needs fixing — all in the same place.
| Feature | JustDone | Typical free checker |
|---|---|---|
| Originality score with source links | ||
| Detects paraphrased & reworded matches | ||
| One-click plagiarism removal | ||
| Smart exclusions for quotes & citations | ||
| AI detector & humanizer included | ||
| Your text is never sold or published |
Unlock JustDone Premium
Everything you need to check, fix, and perfect your writing — in one subscription.
See plans & pricing- Unlimited checks on longer documents
- Full report with every matching source
- One-click plagiarism removal
- Detects paraphrased & reworded text
- Smart exclusions for quotes & citations
- Access to every JustDone AI tool
Built for anyone who writes
If your work needs to be original before it's submitted or published, JustDone will get you covered.
Get startedStudents
Catch accidental plagiarism and missing citations before your professor does. JustDone gives you the same view that your institution's plagiarism tool, like Turnitin, will produce.
Researchers and academics
Verify originality across papers and theses against academic databases. Confirm every source is properly credited before submission or peer review.
Educators
Review student work with source-linked results. Use the plagiarism checker to have specific, informed conversations about citation and originality; not just flag a number.
Content writers
Confirm articles and copy are unique before they go live. Protect your clients, your brand, and your search rankings with a quick plagiarism check as a standard step in your workflow.
Everything you need to know about plagiarism
What is plagiarism?
Plagiarism is presenting someone else's words, ideas, or work as your own without proper credit. It isn't limited to copying and pasting — reusing an argument's structure, paraphrasing too closely, or even reusing your own earlier work without acknowledgment can all count.
Most plagiarism in academic writing is unintentional — which is exactly why a quick check before you submit is worth the few minutes it takes.
The main types of plagiarism
Understanding the different forms makes them far easier to avoid.
Direct
Copying text word-for-word with no quotation marks or citation.
Paraphrasing
Rewording an idea but staying too close to the original and skipping the citation.
Mosaic
Stitching phrases from several sources together as if they were your own.
Self-plagiarism
Reusing your own previously submitted work without acknowledging it.
Accidental
A missing citation, misplaced quotation marks, or a source you lost track of.
AI-assisted
Submitting AI-generated text as your own where disclosure is required.
Why originality matters
The consequences are real. For students, even unintentional plagiarism can mean a failing grade, academic probation, or expulsion. For writers and professionals, it can damage credibility and search rankings, or create copyright issues. Beyond the penalties, original work is how you build knowledge and show your own thinking.
How to avoid plagiarism
A few habits prevent the vast majority of problems:
- Cite every source you quote, paraphrase, or summarize, in your required style.
- Quote directly with quotation marks — and paraphrase by genuinely rewriting, not swapping a few synonyms.
- Keep a running list of your sources and page numbers while you research.
- Run a plagiarism check before submitting, and fix anything flagged.
How JustDone's plagiarism checker works
JustDone uses natural language processing to compare your text against billions of web pages and academic sources, detecting both exact matches and paraphrased passages.
Smart exclusions automatically ignore your quotes, citations, and bibliography so the result reflects your own writing — and when something's flagged, you can rewrite it in one click.
How accurate is it?
Accuracy depends on database coverage and how well a tool detects reworded text. JustDone checks against a large, continually updated index and is built to catch subtle paraphrasing simpler tools miss.
One note for students: like every third-party checker, JustDone can't access your university's private Turnitin database of past student submissions, so your institution's report may differ slightly — but checking first helps you catch and fix issues before that point.
Learn more about academic integrity
Practical guides to help you write original work with confidence.
Frequently Asked Questions
What are the main types of plagiarism?
Direct copying, paraphrasing without citation, mosaic plagiarism, self-plagiarism, and accidental plagiarism. JustDone's plagiarism checker tool identifies all of them through sentence-level analysis linked to original sources.
Is paraphrasing considered plagiarism?
Paraphrasing without a citation is plagiarism. The idea still belongs to the original author regardless of how you expressed it. If your plagiarism score flags a paraphrased section, the paraphrase is too close to the source or the citation is missing.
Is using AI or ChatGPT plagiarism?
Submitting AI-generated content as your own without disclosure violates most academic integrity policies. A plagiarism check confirms your text does not match existing sources. A separate AI scan confirms it does not carry AI-generation patterns. JustDone includes both in one workflow.
How can I check if my work has plagiarism?
Paste your text into JustDone's plagiarism checker, run the scan, and review the results. Every flagged section links directly to the matching source so you know exactly what overlapped and what needs a citation or a rewrite.
What percentage of plagiarism is acceptable?
Most universities accept a plagiarism score under 15%, but it depends on what is driving the number. Properly cited quotes appear as matches and are not a problem. Unattributed sections are. Always review what is flagged rather than focusing only on the overall percentage. Besides, check your institution's specific threshold.
Can you plagiarize yourself?
Yes. Reusing your own previously submitted work without disclosure is self-plagiarism and violates most academic integrity policies. Once a paper enters a plagiarism database, a plagiarism check will flag the overlap. Disclose any prior work to your instructor before submitting.
What is accidental plagiarism?
Accidental plagiarism is the unintentional use of someone else's words or ideas without attribution. It includes forgotten citations, over-reliant paraphrasing, or notes that blurred the line between source material and your own writing. It is one of the most common reasons students get flagged, and one of the most preventable with a pre-submission plagiarism check.
How do plagiarism checkers detect copied text?
The plagiarism checker tool breaks your text into fragments and compares them against a large database. Matches are identified by similarity, not just exact copying, so paraphrased plagiarism also gets flagged. JustDone also analyzes sentence structure and writing flow to catch what basic tools miss entirely.
How can students avoid plagiarism?
Cite as you write rather than at the end. Paraphrase from memory after closing the source. Use a citation generator for correct formatting. Run a plagiarism checker early in the drafting process. Catching issues at draft stage takes minutes to fix, not a formal integrity process to explain.
Academic integrity built into every check
JustDone's plagiarism checker is built to support original work, not to help anyone misrepresent work that is not theirs. Before you use JustDone on academic work, check your institution's policy on plagiarism checkers, AI tools, and citation requirements. Rules vary by school, department, and assignment, so knowing yours means you can use the tool in a way that actually protects you.
Built for authentic work
Every feature in JustDone supports genuine original writing. The plagiarism checker is a verification step, not a workaround.
Transparent about AI
A clean plagiarism score is not the same as AI disclosure compliance. JustDone provides clear guidance on both, because they are different things and both matter.
Trusted by educators
Teachers use JustDone to give students a clear, source-linked view of their plagiarism score before they submit, so corrections happen in the classroom, not in an integrity hearing.
Check your work for plagiarism in seconds
Get an originality score, see your sources, and fix flagged passages in one click.
