Table of Contents
The 3 Primary Turnitin Exclusion Filters Explained
When Turnitin generates a Similarity Report, its raw initial calculation counts every single overlapping string of text, including reference titles, direct block quotes, and common academic phrases.
To prevent proper academic citations from inflating student similarity scores, Turnitin equips instructor accounts with three core exclusion toggles:
1. Exclude Bibliography
Detects standard reference list headings (e.g. References, Works Cited, Bibliography) and completely ignores all listed citations that follow.
Reduces Score By 8% – 20%2. Exclude Quotes
Ignores any text enclosed inside double quotation marks ("...") or formatted as indented block quote paragraphs.
3. Exclude Small Matches
Ignores minor overlap sequences shorter than a set threshold (e.g. fewer than 8–10 consecutive words or under 1%).
Reduces Score By 3% – 8%Turnitin Exclusion Impact Simulator
Toggle the instructor exclusion filters below to see how applying standard filters reduces a raw 28% similarity score in real time:
Graduate Research Essay on Machine Learning Policy
Status: Safe Zone (6% Adjusted Score)
STANDARD FILTEREDWith all three standard exclusion filters active, expected citations, references, and common short phrases are removed. Your remaining 6% match reflects acceptable academic writing.
Technical Mechanics: How Turnitin Detects Text for Exclusion
Exclusion filters do not operate by magic—they rely on strict syntactic formatting rules built into Turnitin's parser. If your paper uses non-standard formatting, the filters may fail to recognize citations, leaving your similarity percentage artificially high!
| Exclusion Setting | Supported Formatting Triggers | Common Formatting Errors That Fail Filter |
|---|---|---|
| Exclude Bibliography | Headings titled "References", "Works Cited", "Bibliography", or "Literature Cited" | Headings typed in image format, non-standard titles like "Sources I Used", or missing new-page breaks |
| Exclude Quotes | Double quotation marks ("...") or indented block quotes (4+ lines) |
Single smart quotes ('...') in APA/MLA, or missing closing quote marks |
| Exclude Small Matches | Configured by instructor (e.g. ignore matches < 8 words or < 1%) | No student formatting required (purely administrative setting) |
What Professors Look For: Raw vs. Filtered Reports
When an instructor opens your paper in Turnitin SpeedGrader, they can toggle exclusion settings on and off in real time with a single click.
1. Raw Unfiltered View
Shows total text overlap without filtering anything out. Professors use this to verify if references match published databases or if direct quotes were copied accurately.
2. Filtered Official View
Applies standard exclusion rules (ignoring bibliography and quotes). This represents your true academic similarity score used for institutional grading.
How to Pre-Check Both Scores Safely on TurnproAI
To eliminate guesswork before official university submission, test your manuscript on turnproai.site.
The TurnproAI Dual-Exclusion PDF Guarantee
- Official Turnitin Instructor API credentials
- Forced setting:
submit_papers_to = "none" - Shows both raw and filtered exclusion scores in downloadable PDF
- Full AI writing probability breakdown (cyan highlights)
Inspect Your Excluded & Raw Turnitin Scores
Scan your paper with 0% repository database risk on turnproai.site before turning it in to Canvas or Blackboard.
Start TurnproAI Verification ScanFrequently Asked Questions
References, Works Cited, or Bibliography starting on a new line. If you used a non-standard title like "Sources" or placed it inside an image/table, Turnitin fails to detect the section.
"...") or indented block quote formatting. Single quotes may not always trigger automatic exclusion depending on your regional language settings.
submit_papers_to = none). Your document is evaluated against Turnitin's databases without being saved, keeping your final university submission completely clean.