Turnitin Color Code Explained: What Blue, Green, Yellow, Orange, and Red Mean

One Important Caveat Before We Start

Turnitin is not a single product with one fixed colour scheme. There are at least three variants students commonly encounter:

• Feedback Studio (the default, what most UK/US/AU universities use): Blue 0 → Green 1–24 → Yellow 25–49 → Orange 50–74 → Red 75–100
• Turnitin Similarity / SimCheck: Green 0 → Blue 1–24 → Yellow 25–49 → Orange 50–74 → Red 75–100 (Blue and Green are swapped)
• Some LMS integrations (e.g. certain Brightspace deployments at SUNY Empire): Blue 0–20 → Green 21–40 → Yellow 41–60 → Orange 61–80 → Red 81–100 — completely different bands

Check your own module page before comparing your score to the generic table below. If you're on a UK Feedback Studio integration — which is by far the most common — the numbers below apply directly.

What You Actually See When You Open a Turnitin Report

Open the report and the first screen is not a colour bar. It's an Integrity Overview with four things, in this order:

1. Overall Similarity (the big percentage)

One number, 0% to 100%, showing the fraction of your text that matches something in Turnitin's database (web pages, journal articles, books, and 1.9 billion previous student submissions). This is the number that gets aggregated into the inbox icon colour.

2. Match Groups (four categories)

This is the part most "Turnitin colour" articles miss entirely. The new enhanced report groups every matching passage into one of four Match Groups, based on whether you cited and/or quoted the source. From Turnitin's guide to the enhanced similarity report:

The Match Group your highest percentages fall into matters much more than the raw total. A 28% score made entirely of Cited and Quoted matches is safer than a 12% score sitting in Not Cited or Quoted.

3. Top Sources (three categories)

A second breakdown, by where the matches came from:

• Internet sources (web pages, blogs, open PDFs)
• Publications (journals, books, conference proceedings)
• Submitted works (Student Papers) — other students' papers from the global repository

Markers treat these differently. A 15% match across hundreds of Internet sources of common phrasing is boring. A 15% match concentrated in a single Student Paper from the same institution is where investigations start.

4. Integrity Flags

A separate count, independent of the similarity score, from Turnitin's Integrity Flags documentation. Two flag types exist:

• Replaced Characters — Cyrillic or Greek letters swapped in for Latin letters to dodge matching (e.g. a Greek "α" replacing a Latin "a")
• Hidden Text — white-on-white text added to confuse the matcher, inflate word count, or break up plagiarised passages

Flags are not automatic misconduct — Oxford Brookes' testing found Turnitin sometimes flags text that is not actually hidden — but a non-zero flag count will always be manually reviewed.

If you take one thing from this section: when your marker opens your report, they look at Match Groups and Integrity Flags before they care about the overall colour band. The colour is the summary; the Match Groups are the substance.

Where the Colours Actually Appear

Now that you know what the report contains, here's where colour shows up:

In the Assignment Inbox (what your marker sees first)

The similarity score for students guide describes this: in the assignment inbox, each submission gets a coloured icon next to the filename indicating its similarity band. That's the Blue/Green/Yellow/Orange/Red scale most students think of as "the Turnitin colour." It's a one-glance sorting mechanism, nothing more.

Inside the Report (the highlight colours)

Once the report opens, the inbox band colour is gone. The document itself uses highlight colours keyed to Match Group (not similarity band). Each matched passage is highlighted in the colour of its Match Group, so you can see at a glance which passages need citation fixes versus which ones might be misconduct.

In the AI Writing Report (a separate report entirely)

Turnitin's AI writing detection lives in a different report — see how to access the AI Writing Report. Its indicator uses a completely different colour logic, covered later in this article.

Each Colour Band Explained (Feedback Studio Inbox)

Remember: these bands describe the inbox icon. Inside the opened report, what matters is the Match Group breakdown — the band colour is just a starting point.

Blue (0%): No Matching Text Found

Blue means Turnitin couldn't match a single phrase in your document against anything in its database. On reflective journals, creative pieces, or personal statements, that's normal. On a research-based essay or dissertation chapter, it's often a warning:

• No quotes, no citations. If you wrote an evidence-based argument without quoting or paraphrasing a single source, your marker will wonder where the evidence came from.
• File conversion problem. Turnitin sometimes fails to parse scanned PDFs or documents with unusual encoding, returning 0% because it couldn't read the text. Always download the PDF copy of your report and check the body text is selectable.
• Wrong file submitted. A blank template, an early skeleton, a draft with only headings. Check the filename.

If your report is blue and the assignment required sources, open the submitted file and verify it's the right one before celebrating.

Green (1% – 24%): Normal Territory

Green is where most well-researched, properly cited student work lands. Matches are proportionate and usually traceable to legitimate sources: the reference list, direct quotations, subject-specific terminology, and common phrasings.

Don't try to "improve" the number by over-paraphrasing — you'll either introduce awkward writing or, worse, accidental misrepresentation of a source. If your Match Groups breakdown shows most of the percentage sitting in Cited and Quoted, green is exactly where you want to be.

When green is still a problem: when the matched 12% sits inside Not Cited or Quoted as one concentrated uncited paragraph. The colour looks fine; the actual Match Group tells a different story. Always check the Match Groups breakdown, not just the overall colour.

Yellow (25% – 49%): Worth a Closer Look

Yellow means "something's making this score climb higher than usual." It's not automatic trouble, but your marker will almost certainly click into the breakdown. Common causes:

• Too many block quotations. Legitimate but often graded down for weak analysis.
• Bibliography not excluded. Some departments configure Turnitin to exclude the reference list; others don't. A heavy reference list on a long dissertation chapter can push you into yellow on its own. Check the Filters panel — there's a Bibliography toggle.
• Secondary sources copied across essays. If you reuse the same literature review across modules, Turnitin may match your new submission against your previous one.
• Template or prompt text that you forgot to remove. Coursework briefs, question sheets, and instructions pasted into your document all get counted.

What to do at yellow: open the Sources tab, look at what's producing the top matches, and check which Match Group each match falls into. If most of the percentage is in Missing Quotations or Cited and Quoted, you're fine. If chunks are sitting in Not Cited or Quoted, fix them before the deadline if you still can.

Orange (50% – 74%): High Match — Expect Scrutiny

Orange is rare in legitimate student work. When it happens honestly, it's usually on very short assignments, highly technical ones, or ones with a large fixed template. Why orange shows up:

• Short word count combined with heavy template or terminology. Technical assignments with standardised headings and field-specific vocabulary can run high by volume alone.
• A template-heavy assignment. Business reports, lab reports, and clinical notes often come with large sections of given content (company overviews, methodology boilerplate).
• Resubmission of a prior draft. More on this in the Red section — it depends on whether you resubmitted within the same assignment or to a different one.
• Heavy quotation of primary sources. A literature essay quoting long passages from a play or novel may creep into orange.
• Genuine copying. Chunks lifted from websites, from AI output with minimal rewriting, or from a shared document with a classmate.

Orange always triggers manual review. If it's legitimate (template overlap, heavy primary-source quotation), your tutor will usually see that quickly via the Match Groups panel and move on. If unaccounted matches sit in Not Cited or Quoted, you will be asked to explain them.

Red (75% – 100%): Investigation Territory

Red reports are almost always either a mistake or serious misconduct. The two possibilities:

Administrative mistakes (fixable)

• Wrong file submitted. A previous essay, a classmate's draft, or even someone else's paper entirely. Check immediately.
• Cross-class resubmission self-match. This is the subtle one. Turnitin's default behaviour, documented here, is that re-submitting within the same assignment automatically excludes your earlier draft as a self-match. But if you submitted a draft to a different class or dropbox that saved the paper to the repository, then submitted the final to the real assignment, your final will match itself at 100%. Fix: ask your tutor to exclude your earlier submission from the Sources panel. For future drafts, ask if the dropbox can be set to No Repository so nothing is stored.
• Corrupted or test submission. Some universities have a test dropbox; occasionally a student accidentally submits to the live module instead.

Serious misconduct (not fixable)

• AI output pasted wholesale with shallow paraphrasing. Pattern: long runs of matching text from multiple sources, scattered throughout the document.
• Paid essay mill or contract-cheating content. The exact paper has been sold to multiple students and is now in the repository.
• Copied from a friend or family member. Turnitin's global student-paper database (1.9 billion submissions as of mid-2025) catches this readily, especially within the same institution.

If you hit red, don't frantically rewrite and resubmit — your first submission is already in the system. Email your tutor immediately and explain what happened. Honesty about a wrong-file upload gets sorted within a day; silence looks like evasion.

The Big Caveat: Colour Is Not Plagiarism

The single most important thing to understand about Turnitin colours is that they measure text overlap, not academic misconduct. The tool doesn't know whether:

• A matching quote is properly cited with quotation marks and a reference
• A matching sentence is boilerplate methodology used in every paper in your field
• Your bibliography is in the match count or excluded
• You or your previous self wrote the matching paper

All of that requires human judgement — and the Match Groups panel is the first place a human looks. Colours are a sorting mechanism, not a verdict.

AI Writing Detection Uses a Different Colour System

Turnitin's AI writing detection is a separate report from the similarity report — it doesn't share the Blue/Green/Yellow/Orange/Red inbox scale at all. From Turnitin's AI writing detection FAQs:

AI indicator states (in the inbox/report side panel)

• Blue with a percentage — the submission processed; the percentage shows how much text is flagged as likely AI-generated or AI-paraphrased
• Asterisk (*%) — the detector found AI-likely text below Turnitin's 20% confidence threshold, so no percentage is attributed (this avoids false positives on short passages)
• Gray — the submission couldn't be processed (wrong file type, too short, etc.)

AI highlight colours inside the AI report

• Cyan — text that looks like it came from a Large Language Model (with or without AI-bypasser modification)
• Purple — text that looks both AI-generated and AI-paraphrased (the riskiest combination)

These colours are completely independent of the similarity highlight colours. A submission can show a green similarity inbox icon and a cyan-heavy AI report, or vice versa. Treat them as two separate reports that happen to live inside the same Turnitin interface.

For more on how AI detection compares across tools, see our JustDone AI detector review and our AI detector comparison.

What to Do Before You Hit Submit

Reading the colour after submission is too late. Pre-empt the obvious score inflators:

1. Check the Bibliography and Quotes filters. Ask your tutor if the dropbox excludes the reference list and long quotations by default. If not, ask if it can be.
2. Mark direct quotes properly. Quotation marks, author, year, page number. No creative reformatting.
3. Keep a version history. If your report comes back high and you're questioned, your draft history (Google Docs version history, Word AutoSave, Git commits) is the single best evidence you wrote the piece yourself.
4. Do not use free online "Turnitin checkers." Turnitin is institution-only — there is no free individual version. The sites advertising otherwise typically either (a) add your paper to their own database and later sell it to essay mills, who resubmit it to Turnitin, or (b) harvest your paper and personal details for resale. Either way, your legitimate submission months later will flag as a high match against "sources" that are really your own earlier upload. Real cases of this exist on university forums.
5. Pre-check on the system your university actually uses. A clean score on GPTZero or a free tool tells you nothing about what Turnitin will show — different database, different detector. If you want a real pre-submission Turnitin report, that needs access to an institutional Turnitin account.

FAQ

What does green mean on Turnitin?

Green means your similarity score is between 1% and 24% in the Feedback Studio inbox — the normal range for most properly researched and cited student work. Most markers glance at green reports and move on. Green is not an automatic pass: a 12% report where the matched 12% sits in the Not Cited or Quoted Match Group is still misconduct, even with a green overall colour.

Is yellow on Turnitin bad?

Not automatically. Yellow (25–49%) just means your match is high enough that your marker will open the Match Groups breakdown. Plenty of legitimate reports land in yellow — long literature essays with heavy quotation, assignments where the bibliography wasn't excluded, short technical briefs with heavy terminology. It's a flag to check the breakdown, not a sanction.

What does a blue Turnitin score mean?

Blue indicates 0% similarity — Turnitin didn't find any matching text. On creative or reflective assignments, that's fine. On research essays, blue is often a warning that something went wrong: wrong file submitted, a PDF Turnitin couldn't parse, or no sources cited at all. Open the submitted file and verify.

What percentage is red on Turnitin?

Red is 75% or higher in the Feedback Studio default scheme. It almost always indicates either an administrative mistake (wrong file submitted, cross-class self-match) or serious misconduct (AI content pasted wholesale, essay mill content, copied from another student). Email your tutor immediately if you see red — explaining a file mistake on day one always goes better than waiting to be called in.

What are Match Groups in my Turnitin report?

Match Groups are how the enhanced Similarity Report breaks down each matching passage by citation behaviour: Not Cited or Quoted, Missing Quotations, Missing Citation, or Cited and Quoted. The Match Group your matches fall into matters more than the raw percentage — 25% across Cited and Quoted is safer than 12% concentrated in Not Cited or Quoted. Markers use the Match Groups panel as their primary review tool; the overall colour is just a triage.

What do Integrity Flags mean?

Integrity Flags are a separate count from the similarity score. They indicate text manipulation — Hidden Text (white-on-white or invisible characters) or Replaced Characters (Cyrillic or Greek letters substituted for Latin to dodge matching). A flag count above zero doesn't automatically mean misconduct — Turnitin's own guidance (and testing from Oxford Brookes) notes the detector can flag text that isn't actually hidden — but flags always trigger manual review, so it's worth checking your document doesn't have stray formatting before you submit.

Can I lower my Turnitin colour before submitting?

You can lower the legitimate portion of the score — better paraphrasing, properly excluded bibliography, fewer block quotations, cleaner citations. You can't (and shouldn't) make uncited matches disappear by running your paper through paraphrasing tools, because the rewritten text often trips AI detection even as it lowers similarity. If you're trying to bring down a high colour, the safe order is: fix the Match Groups sitting in Not Cited or Quoted → reduce direct quotes → improve paraphrasing → check the Bibliography/Quotes filter settings.

Does the colour alone decide whether my professor calls me in?

No. Markers use the colour as a prioritisation tool — green reports often get a quick skim, orange reports get a careful Match Groups breakdown. What actually triggers an academic misconduct hearing is unaccounted matches sitting in the Not Cited or Quoted Match Group, regardless of the overall colour. A calm 18% green with one hidden copied paragraph is more dangerous than a busy 55% orange where every match is cited and quoted.