How to run a plagiarism check

Promise: In 3 steps, you will have a plagiarism report with matched sources, percentages, and sentence-level attribution.

Step 1 — Open the Plagiarism Checker

Plagiarism Checker landing page with the empty input panel ("Paste your text here to check for plagiarism, min 30 words"), Upload file / Paste here buttons, an empty 0% score panel on the right, and a "Check for Plagiarism" CTA below.

From the GPTinf home page or the tools menu, click Plagiarism Checker.

Note: Anonymous users cannot run a plagiarism check — you need a free registered account. Sign up takes about a minute.

Step 2 — Paste your text

Paste into the input panel. The checker accepts plain text. For files, copy text from the file directly.

Step 3 — Run the scan

Click Check plagiarism. The scan runs against web sources and returns a report. Most scans complete within a minute.

Completed plagiarism report — input text on the left with several yellow-highlighted matched segments, a 34% Plagiarism gauge on the right marked "High Plagiarism Detected, 10 sources found", and a Matched Sources list (linkedin.com 21.6%, tradingview.com 18.3%, fairgen.ai 12.0%) with per-source segment counts.

Reading the report

You will see three things:

Overall plagiarism percentage — how much of your text matched something online.
Inline highlights — matched segments are color-coded in your text.
Sources — a list of URLs with match percentage and segment count. Click a source to see exactly which parts of your text matched it.

Free vs. paid scans

Free registered: up to 500 words/day across all your scans. You see the full report.
Paid (any plan): unlimited scans, no daily cap.

See Free vs. paid plagiarism checks: what changes for the side-by-side.

What the report includes

Free and paid scans both return:

Plagiarism percentage.
Matched sources with URLs.
Sentence-level source attribution (each matched sentence linked to its source).
A copy-friendly view for review.

Tip: The Plagiarism Checker is the most data-backed tool in GPTinf. In a head-to-head test on the same text, it found 152 sources where the next-best tool found 14.

FAQ

Will the checker find paraphrased text? Direct paraphrases yes, very loose paraphrases sometimes not. For the strongest check, run plagiarism after you have done your final edits, not on early drafts.

Does it check paywalled academic databases? No — it scans the open web. Academic databases like ProQuest or JSTOR require institutional access and are not in scope.

Can I export the report? The on-screen report is the report. Take a PDF or print preview from your browser for a saved copy.