Scribbr Plagiarism Checker: See What Your Professor Sees
Scan your paper against a comprehensive academic database covering billions of web pages and published journals — before you submit. Free similarity score, full source report from $2.99.
Source list · Matched passages · Citation suggestions · PDF download
How the Scribbr Plagiarism Checker Works
Three steps from paste to a full academic similarity report.
Upload or Paste Your Paper
Paste your essay directly or upload .docx, .pdf, or .txt. Works with any academic writing — essays, theses, dissertations, and discussion posts.
Scanned Against Academic Database
Your text is checked against 16+ billion web pages and 80+ million academic papers, including published journals, institutional repositories, and online sources.
Get Your Similarity Score
See an instant similarity percentage. Unlock the full report for source-by-source breakdown, highlighted passages, and citation fix suggestions.
More Than a Similarity Score
Every feature is built for students who want to understand and fix their work before submission.
Comprehensive Academic Database
The Scribbr plagiarism checker scans against a comprehensive academic database — covering published journals, web sources, and institutional repositories — giving you a reliable pre-submission similarity score.
Source-by-Source Breakdown
The full report identifies every matched source individually — which paragraphs overlap, the exact contribution from each source, and whether the match is a direct quote or paraphrase.
Zero-Retention Privacy
Your paper is processed in-memory and discarded when your session ends. Never stored, indexed, or added to any database. GDPR compliant by design.
Citation Fix Suggestions
For each flagged passage, the full report suggests the correct APA, MLA, or Chicago format — so you can fix attribution issues rather than just knowing they exist.
Multi-Language Support
Plagiarism detection works for papers in English, Spanish, French, German, Portuguese, and 20+ additional languages. Non-English sources are checked too.
AI Content Detection Included
The full report also flags sections with high probability of AI-generated content — useful before submitting to institutions that use AI detection tools.
Is the Scribbr Plagiarism Checker Free?
A free similarity score is included. The full source breakdown is available on paid plans.
- Full source-by-source similarity report
- All matched passages highlighted inline
- APA / MLA / Chicago citation suggestions
- AI detection results included
- Downloadable PDF report
- Grammar check included
Monthly plan also available at $19.99/mo
Scribbr vs. Other Plagiarism Checkers
Not every checker uses the same database — and that difference shows in your results.
| Feature | Scribbr | Grammarly | Quetext | PaperRater |
|---|---|---|---|---|
| Academic Paper Database | ✓ | ✓ | ✓ | ✗ |
| Academic Paper Database | ✓ | ✓ | ✓ | ✗ |
| Source-by-Source Report | ✓ | ✗ | ✓ | ✗ |
| AI Detection | ✓ | ✓ | ✗ | ✗ |
| Citation Suggestions | ✓ | ✗ | ✗ | ✗ |
| Zero Data Retention | ✓ | ✗ | ✗ | ✗ |
| Free Similarity Preview | ✓ | ✓ | ✓ | ✓ |
Used Before Every Submission
“I check every paper here before submitting to Canvas. The similarity score is accurate and matches what my course plagiarism checker shows. Caught an uncited quote in my lit review before my advisor saw it.”
“The free score was useful, but the full source report showed me exactly which quotes needed proper citation format. Ten minutes to fix, versus a potential integrity issue.”
“Writing my Master’s thesis and use this weekly to check chapter drafts. Fast turnaround and the breakdown by source makes it clear what to address before my supervisor reads it.”
Common Questions
What Is the Scribbr Plagiarism Checker and How Does It Work?
The Scribbr plagiarism checker scans academic papers for copied content using a comprehensive academic database covering published journals, web sources, and institutional repositories. Unlike basic web-based checkers that only look at publicly available pages, Scribbr checks against billions of sources, making it significantly more reliable for pre-submission use.
The core workflow is simple: paste or upload your paper, wait 15–30 seconds, and receive a similarity percentage. This free score tells you how much of your text matches sources in the database. The full report goes further — listing every matched source, showing which passages triggered each flag, and offering citation format recommendations so you can address issues before your instructor sees them.
How the Scribbr Plagiarism Database Works
The Scribbr plagiarism checker draws from a multi-source academic database covering published journal articles, institutional repositories, and billions of publicly indexed web pages. This breadth of coverage is what separates it from simpler web-only checkers that miss matches in academic literature — the most common source of uncited content in student submissions.
The result is a similarity percentage that reflects what your professor is likely to see, rather than a surface-level estimate based on web pages alone. Comprehensive academic database coverage is why the Scribbr checker is consistently recommended by writing centers and academic support staff at universities worldwide.
How to Interpret Your Similarity Score
A similarity score is not a verdict. It is a statistical measure of how much text in your document matches text in the database. Properly cited quotations, properly attributed paraphrases, and common academic phrasing can all contribute to a similarity score without representing misconduct.
What percentage is acceptable?
- Scores below 15% are generally considered low risk for most academic contexts
- Scores between 15% and 25% are worth reviewing to ensure all sources are properly attributed
- Scores above 25% typically warrant closer attention and may require revision before submission
- Scores above 40% are often flagged automatically for instructor review
Common reasons for unexpectedly high scores
- Reference lists and bibliographies are included in the word count and may contain matching text from cited sources
- Common academic phrases and standard methodology descriptions appear across many papers
- Collaborative assignments where multiple students submitted similar responses
Scribbr Plagiarism Checker Pricing: Free vs. Paid
The free tier provides the overall similarity percentage — useful as a quick health check before submission. The paid report adds a source-by-source breakdown, inline passage highlights, citation format recommendations, and a downloadable PDF. For students running a routine check on work they are confident is clean, the free score may be sufficient. For anyone with a borderline score or submitting high-stakes work, the full report provides the specific detail needed to make targeted improvements.
Tips for the Most Accurate Scribbr Result
- Check the version you will submit, not an earlier draft — final edits can introduce new matches if you incorporate text during revision
- Include your reference list to get the most complete picture of what your institution’s checker will see
- Use the full report, not just the percentage — a 22% score with properly attributed quotes is very different from a 10% score with three uncited passages
- Act on the citation suggestions — the most common cause of avoidable high similarity is proper paraphrasing without proper attribution