Free Plagiarism Checker
Free Plagiarism Detector

Free Plagiarism Checker

This plagiarism checker matches your text against published writing and reports what it found. You get a percentage split, the passages that matched, and the sources they matched against.

  • Paste text or upload a file to scan
  • A thousand words per check at no cost
  • Matched passages highlighted in the text
  • Download the result as a report
Check Plagiarism

What Is a Plagiarism Checker

A plagiarism checker compares a piece of writing against published material and reports how much of it already exists elsewhere.

A plagiarism checker takes the text you paste or upload, compares it against indexed web pages and published documents, and returns a report. The report is built from three parts: the share of text that matched, the specific passages behind that number, and the sources each passage was found in. The result is a measurement rather than a judgement. A high number can mean a lifted paragraph, or it can mean a technical description that has only one sensible phrasing. Reading the matched passages is what separates the two.

Why Choose This Plagiarism Checker

The report answers three questions in order: how much matched, which passages matched, and where those passages came from.

Check a thousand words without paying

Each free check covers up to 1000 words, which is enough for an article, a blog post, or a full essay. Higher word limits and unlimited checking are available on the paid plans for longer documents.

See the split between copied and original

The header reports the overall share of matched text and the share that is unique, and the text itself is graded by colour so the shape of the result is visible before a single line is read.

Read the sources the text matched

Below the score sits a list of the sources behind the matches. Seeing which page a passage overlaps with is what makes it possible to decide between citing it, rewriting it, or leaving it as it stands.

Find the duplicate passages in place

Copied sections are highlighted inside the submitted text rather than listed separately. Editing can start from the passage itself, without matching a quote back to its position in the document.

Take the result away as a report

The finished check can be downloaded as a document, which is what a submission or a review process needs. Clearing the input afterwards returns the tool to an empty state for the next piece of text.

Check writing in more than a hundred languages

The scanner covers over 100 languages, including English, Spanish, Indonesian, German, French, Portuguese, and Dutch. A passage written in another language can be checked in that language rather than translated first.

Plagiarism Checker

Plagiarism Checker

@tusummary

Pain point: a paragraph sounds familiar and there is no way to place it

Longer pieces borrow without meaning to. A phrase read last week comes back while drafting, gets written down as a new sentence, and the writer cannot say where it came from. A spell check notices nothing. Running the text through a plagiarism checker matches it against published material and reports what it found. The percentage matters less than the list of matches underneath it, which turns a vague feeling into a specific line that can be rewritten or cited.
Check Plagiarism
Marked passage with an unnamed source beside it
Plagiarism Checker

Plagiarism Checker

@tusummary

Pain point: the citation is there but the wording is not different enough

Paraphrasing a source closely leaves the original sentence structure intact. The reference list is correct, the intent is honest, and the passage still reads as a copy with a number attached to it. A plagiarism checker shows which sections match published text whether or not a citation is present. Seeing the matched span makes it possible to rewrite the sentence structure instead of only adding a reference to it.
Check Plagiarism
Quoted passage beside its source with matching wording
Plagiarism Checker

Plagiarism Checker

@tusummary

Pain point: how much of a quote is too much

Direct quotation has a limit that shifts with the assignment and with the publication. What counts as reasonable in one context reads as padding in another, and the difference is usually argued about rather than measured. The report separates quoted material from the rest of the text, so the proportion is visible before the piece leaves the desk. A number attached to the quoted share is easier to act on than an opinion about whether there is too much of it.
Check Plagiarism
Page with several quoted lines underlined
Plagiarism Checker

Plagiarism Checker

@tusummary

Pain point: a page cannot go live until it is cleared

Published writing carries a risk that private writing does not. A page assembled from research notes can carry passages from other sites, and search engines treat duplicated text as a reason to rank a page lower. For anyone publishing, the plagiarism checker is the step between finishing an article and putting it online. The percentage and the source list are the two things worth reading, and both appear on the same screen.
Check Plagiarism
Article open beside a publishing dashboard
Plagiarism Checker

Plagiarism Checker

@tusummary

Pain point: the assignment does not read like the student wrote it

An essay that changes voice halfway through is a signal, not a proof. Teachers need to know which section came from the student, and a report has to be specific enough to discuss. Matched passages are highlighted in the text rather than summed up as a suspicion. With the copied sentences visible, the conversation moves from an accusation to a list of paragraphs that need to be written again.
Check Plagiarism
Teacher marking an essay with highlighted sections
Plagiarism Checker

Plagiarism Checker

@tusummary

Pain point: the result has to be handed to someone else

A check done privately and a check done for a record are different tasks. One ends with an edit, the other ends with evidence that the check happened at all. The report can be downloaded as a document and the input cleared afterwards, which is what makes the tool usable for a submission or a review. The score, the matched passages, and the sources arrive together instead of as a screenshot of a screen.
Check Plagiarism
Downloaded report on a desk
Plagiarism Checker

Plagiarism Checker

@tusummary

Pain point: the free allowance runs out on a long document

A thousand words covers an article and most essays, but not a thesis chapter. Knowing where the limit sits is what keeps a check from stopping halfway through the text. A long piece can be checked in sections against the same free allowance, or the higher limits on the paid plans can be used for a single pass. The word count is visible before the check starts rather than after it fails.
Check Plagiarism
Word counter on a long document
Plagiarism Checker

Plagiarism Checker

@tusummary

Pain point: the file is not something you can select and paste

A chapter arrives as a document, not as text in a browser window. Selecting the content by hand out of a word processor is a step that introduces mistakes of its own. The input takes a pasted passage or an uploaded file, so a long submission goes in exactly as it was received. The check then runs on the same text the reader would see.
Check Plagiarism
Document upload screen with a file selected
Plagiarism Checker

Plagiarism Checker

@tusummary

Pain point: the text was not written in English

The writing being checked is not always in one language. A passage lifted from a Spanish article and translated into an English draft still came from that article, and a check that only reads English will not find it. More than a hundred languages are covered, among them Spanish, French, German, Portuguese, Dutch, and Indonesian. A passage can be checked in the language it was written in rather than being translated first.
Check Plagiarism
Text in several languages side by side

How to Use This Plagiarism Checker

Four steps from a draft to a report you can keep.

Step 1

Add the text

Paste the passage into the input box or upload the file it came from. The counter below the box shows how much of the 1000-word free allowance the text is using.

Step 2

Run the check

Press Check Plagiarism. The comparison against indexed pages and published documents runs in the background and finishes within seconds.

Step 3

Read the score and the matches

The result shows the share of matched and unique text, the passages that overlapped with published writing, and the sources those passages came from.

Step 4

Download the report and clear the input

Download the result as a document if it needs to be kept, then press Clear to empty the box. The tool is ready for the next piece of text.

Who Runs a Plagiarism Check

The tool is used wherever writing has to be verified rather than simply read.

TM

Teachers marking work

Student assignments

A report that names the matched passages gives a marking conversation something concrete to work from, instead of a general suspicion that the writing is not the student's.

CW

Content writers

Blogs and articles

Research notes blend into the draft without leaving a trace. A check before filing the piece shows which paragraphs drifted too close to their source while there is still time to rewrite them.

SS

SEO specialists

Pages before publishing

Pages built from competitor research can carry the same phrasing as the pages they were researched from. The source list is what makes the overlap obvious before the page goes live.

Frequently Asked Questions

What the check measures, what it costs, and what the result means, answered in the order people usually ask.

Check the text before it goes out

Add the passage or the file, run the scan, and read which parts of the writing already exist somewhere else.

Check Plagiarism
What a Check Can and Cannot Do

A percentage is a signal, not a verdict

Matching text is not the same thing as stolen text. Quoted material, standard definitions, and technical descriptions that have only one sensible wording all raise the score without raising a problem. Read the highlighted passages, decide what each one is doing there, and treat the report as the start of that decision rather than the end of it.