Free Plagiarism Checker Online
Check your draft for matching text before you publish, send it to an editor or submit it for review. Choose the private reference corpus configured for this website or supply reference text for a direct comparison. EduGuestPost’s free plagiarism checker returns a scoped report for you to interpret.
Review matched coverage, available source details and overlapping passages. Use the evidence to identify wording that needs a quotation, a citation, a clearer paraphrase or further checking.
Comparison scope: Choose the site’s configured private reference corpus or a direct comparison with reference text you supply. Public-web or hybrid comparison uses a licensed service only when that configuration is enabled. Read the active scope before checking; your report identifies the mode used. No mode guarantees complete internet coverage.
Minimum: 100 words. Maximum: 60,000 characters. You can paste text or load a supported text file into the form. Analysis runs on this website’s server.
Check your text
Compare your draft. Review the evidence.
Choose the reference scope before sharing text. The report shows supported wording overlap within that scope; it does not establish authorship or provide a passing grade.
Paste the passage you want to review, or load a text file and confirm the contents in the text box. Include the surrounding sentences so you can judge each match in context.
The file reader accepts TXT, Markdown, HTML, CSV and JSON text files up to 2 MiB. These files populate the text field; they do not create separate spreadsheet-row checks or automatically extract a formatted document’s main article. Review the loaded text before checking. Files and passages above the limits are rejected rather than shortened silently.
For a longer document, divide the text into clearly labelled sections and review every section. A result applies to the submitted text and the comparison sources available for that scan.
The optional domain-exclusion field lets you specify domains to leave out of the comparison. Use exclusions deliberately, and keep a record of which sources you omitted when reviewing the result.
Enter the draft, choose the comparison scope and add reference text when using direct comparison. Load a supported text file if needed and review optional exclusions before checking. Start with Run check or use Clear to reset the input.
Compare a draft with reference text
Choose direct reference comparison to review wording shared by a draft and a reference passage you supply. Paste both texts or load supported text files, then check that the inputs contain the passages you intended.
Use the side-by-side view to inspect the draft and the supplied reference. This mode can help review an earlier version or permissioned source, but it only compares the submitted texts. It does not create a personal source library or expand the scan into a public-web search.
How to use the plagiarism checker
1. Prepare the passage
Submit at least 100 words and review the live word and character counts beside the input. Remove unrelated navigation, repeated template text and code if you are reviewing an article’s prose. Preserve meaningful quotations and references so you can evaluate how they are used.
Use the Word Counter and Keyword Density Checker if you need to check the length of your draft. Its phrase counts can help you inspect repetition; they do not establish originality or an ideal keyword density.
2. Run the comparison
Choose the private corpus or direct reference comparison and read the active scope before starting. If you use direct comparison, supply the reference text you have permission to review. Wait for a completed response and read its mode and notices. An enabled external configuration has its own provider scope.
3. Inspect the evidence
Review any matching sources and passages returned. Compare the wording, the surrounding argument and the way the source is credited. Common phrases, properly attributed quotations and reused templates require different editorial decisions.
4. Revise and check the revised text
Correct the specific issue you found. Add attribution where needed, quote exact wording appropriately or write a fresh explanation based on your understanding of the source. Submit the revised passage for a new comparison.
Treat the earlier report as a record of the earlier draft. Editing the text or comparison settings marks that result as belonging to the earlier version. Run a new check before using the result for the revised text.
What your report means
The report provides several measures to support a source review. Read them together with the comparison scope and the matched passages.
Comparison mode
Identifies the private corpus, supplied reference text or enabled external configuration used for this check.
Words reviewed
Shows the length measured by the checker for the submitted text.
Matched coverage
Shows the unique matched portion of the analyzed text within the selected scope. Words covered by overlapping sources count once in overall coverage.
Originality in indexed corpus
Describes the portion not matched in the selected reference scope. For a corpus scan, this is indexed-corpus originality. A high value does not prove internet-wide uniqueness.
Matching sources
Counts sources returned by the comparison. Open available evidence to understand each source’s relevance.
Longest matching passage
Helps identify an extended overlap that may deserve closer review.
Corpus document count
Describes the configured comparison collection for that result; the collection can change.
Source and passage details
Supply available source information and overlapping wording when matches are returned.
An originality value of 100% means this completed scan found no supported overlap within its reported reference scope and selected settings. Other sources or excluded material may still contain similar wording.
Different source percentages describe different relationships. A source’s own overlap measure and its contribution to your submitted text are not interchangeable, and overlapping matches should not be added together to create a new overall score.
Review the passage before making a decision
A similarity report helps you locate text to inspect. It does not determine a writer’s intention, establish copyright ownership or automatically decide whether a passage is acceptable.
The examples below are illustrative; they are not results from a live scan.
A familiar phrase such as “at the end of the day”
Consider whether the wording is common and whether the surrounding passage also overlaps.
A quotation with a source reference
Check the quotation marks, attribution, accuracy and applicable reuse requirements.
Several distinctive sentences closely following another article
Read both passages, verify the source and revise or quote the borrowed wording appropriately.
Text reused from an earlier article you wrote
Review the publisher’s reuse policy and whether the earlier work needs acknowledgement.
A brief match can matter when it contains distinctive wording. A longer match can be legitimate when it is clearly quoted and used appropriately. Make the decision from the evidence and the requirements of the intended publication.
Move from a passage to its source evidence
Review the available source cards and their matched passages. Use the match navigation controls to move between supported overlaps, then compare the wording with the source information returned for that scan. Matching views remain available on smaller screens.
Corpus and supplied-reference evidence has its own source scope. A listed URL, title or reference label does not prove ownership, publication order or that reuse is permitted. Inspect the passage and attribution before making that decision.
Review exclusions and restore the full result
Use the available controls for quoted text, minimum match length, domains and exact source URLs to focus the comparison. Domain and exact-URL exclusions have different scopes; check which rule you chose.
After a completed scan, exclude or restore individual returned sources and review the recalculated unique coverage. Keep the selected settings with the result and restore sources when you need the original view. Excluding a quotation or source does not establish correct attribution or make the remaining text acceptable automatically.
An originality review for articles and editorial work
Blog posts and website content
Check important passages while you still have time to revise them. Focus on borrowed explanations, closely repeated introductions, copied examples and source-dependent statements. Add your own analysis and useful detail rather than replacing a few words solely to change a percentage.
Guest articles
Use a comparison as one step in preparing a submission. Then check the publisher’s requirements for originality, sourcing, quotations and previously published material. Our Editorial Standards explain the wider review expected for content prepared for publication.
Editors and agencies
Use the report to start a specific conversation about passages that need review. Record the draft version, source scope and changes requested. A report on a short excerpt does not cover the remainder of an article or every source on the web.
Essays and academic drafts
Use the current checker for a preliminary review against its configured corpus. Academic institutions can use different databases, settings and policies. This result does not predict a Turnitin report or replace an institution’s required submission and review process.
Finish the source review with the right writing tools
When a passage needs attribution, use the APA and MLA Citation Generator to format the bibliographic details you supply. It formats individual references; you still need to verify the source, its details and the statement you are citing.
After revising, review sentence difficulty with the Readability Score Calculator. Readability estimates help you adjust English prose for your audience, while accuracy and usefulness require a separate editorial review.
Prepare supported HTML or Markdown in the HTML and Markdown Editor. Its preview and copy or export controls help you review the supported formatting before moving the content to your publishing workflow.
For article planning, original drafting and editorial support, explore our Guest Post Content Writing Service. Share the publication brief and sources that need consideration so the work can address the actual editorial requirements.
Plagiarism, duplicate content and SEO
Plagiarism concerns how material is used and attributed. Duplicate content concerns substantially similar material appearing in multiple places. These questions can overlap, but a text-similarity percentage alone does not answer either one fully.
Duplicate content does not automatically create a Google penalty. Review the reason for duplication, the pages involved and how those pages are published. This checker compares supplied text; it does not audit your site’s canonical tags, indexing, crawling or search performance.
For an article, concentrate on accurate sourcing, original explanation and material that helps the intended reader. A low matched-coverage value does not guarantee rankings, indexing, publisher acceptance or that the content is useful.
Text similarity and AI writing patterns
A similarity check asks whether wording matches accessible reference material. An AI writing-pattern review examines characteristics of the supplied text. These measures answer different questions.
If you also want to inspect stylistic patterns, the AI Content Likelihood Checker reviews English text of at least 300 words for features such as repetition, rhythm and formulaic language. Its observations do not prove AI authorship or plagiarism.
Use both kinds of report as prompts for careful review. They do not replace reading the source material or understanding how the draft was prepared.
How your text is processed
When you load a supported file, the browser reads its text into the selected input. Running a check sends the draft and any supplied reference text to this website’s server for analysis. An enabled external comparison also uses its configured provider. Direct reference comparison is performed on the server.
Read the processing and local-log information shown with the active comparison mode. Those statements apply to the named configuration; they are not a promise about every third-party service, backup or future account feature. Read our Privacy Policy and the processing information supplied with any enabled external mode.
Use the result controls to copy the report or download its JSON data. CSV download is available when the result contains an exportable table. Saved output includes the comparison scope, scan time, selected settings and notices so you can interpret the result later. Exports start with report data; draft text and source excerpts are included only when you choose to include them. Save the report for the scanned version and run a fresh check after editing.
Keep a scoped report for your review
Copy a result summary, save structured JSON, export an available result table as CSV, or download an HTML report for the completed scan. Use the print view when you need a readable paper copy or your browser’s printing options.
The report retains scope, scan time, settings and notices. Draft text and source excerpts are omitted from exports until you choose to include them. A downloaded HTML report or printed copy is a record of the reviewed version; it is not a certificate of originality, a cloud report account or a Word/PDF export service.
Frequently asked questions
Is this plagiarism checker free?
The public checker’s private-corpus and direct-reference comparisons are free. It requires at least 100 words in the draft and accepts up to 60,000 characters per text input. An enabled external service can have different availability or limits; read the information shown for that mode.
Does it search the whole internet?
No. The default comparison uses the site’s configured private reference corpus; direct comparison uses the reference text you supply. A licensed public-web or hybrid comparison can run only when enabled. None guarantees complete internet coverage.
Does 100% originality prove my text is original?
It means no supported overlap was found within the reported comparison scope. It does not establish authorship, rule out matches in unavailable sources or prove that the ideas are original.
What similarity percentage is acceptable?
There is no universal passing percentage. Review the actual passages, their sources, quotations and citations, then apply the relevant editorial or institutional requirements.
Can properly cited text still match?
Yes. Attribution does not remove the underlying wording from a source. Check whether the wording is quoted or appropriately paraphrased and whether the reference accurately identifies the source.
Can it find paraphrased or translated copying?
The current page does not promise validated semantic-paraphrase or translated-source detection. Those capabilities require a supported comparison system and a clearly described language and source scope.
Which files can I load?
The current reader accepts TXT, Markdown, HTML, CSV and JSON text files up to 2 MiB. They fill the text box for review. PDF, Word-document and scanned-image extraction are separate features and are not part of the current reader.
Can I compare two documents directly?
Yes. Choose direct reference comparison, paste the draft and the reference text, or fill either input from a supported text file. Review both inputs before running the check. This compares the supplied texts on the server; it does not search other sources or create a saved reference library.
Is the entire check performed in my browser?
No. File loading occurs in your browser. Running either a private-corpus or direct-reference check sends the supplied text to this website’s server. An enabled external mode may also involve its configured provider.
Does it detect AI-written text?
The similarity report measures text overlap within its comparison scope. Use the separate AI Content Likelihood Checker for a review of stylistic patterns, and interpret those observations without treating them as proof of authorship.
Can I save the result?
Copy the result summary or download JSON and an HTML report. CSV is available for an exportable result table, and the print view supplies a readable copy. The saved report includes its scope and settings; draft text and source excerpts are included only when you choose to include them. Run a fresh check after making changes.
Does a clear report guarantee publication or rankings?
A similarity report supports one part of an editorial review. Publishers and search systems consider other factors, and sources outside the comparison scope may contain matching material.
Review your draft before the next step
Paste your text, run the comparison and inspect the result within its stated scope. Resolve source-dependent passages, revise the draft and check the version you intend to publish or submit.