Check texts and documents
Paste text directly or upload a supported document. An optional title can be taken automatically from the file.
Plagiarism checker
Check text for plagiarism with linked sources
Certentis’s plagiarism checker compares pasted text and supported documents with discoverable sources. The report links highlighted passages to their sources, helping you review similarities, quotations, paraphrases, and possible reuse.
A match is an indication for review, not proof of plagiarism. Compare the passage with the original source to decide whether it is correctly quoted, properly paraphrased, common knowledge, or problematic.
Try it live
Plagiarism checker
Try this Certentis tool once without an account and get a real result.
Protected processingAbuse prevention using a necessary device cookie and a pseudonymized network signal. Your text never ends up in advertising or analytics.
Start a new plagiarism check
Text
The title is optional. Without a title, we automatically name the report based on the text.
- Words
- 0
- Usage
- 1 check
- Available afterward
- 0 Checks
Plagiarism report
Originality · Similarity
Result after the scan
Start the free check. The full source report appears here automatically.
03Understand your report
Similarity is not automatically plagiarism
Reference lists, technical terms, correctly marked quotations, and common phrasing can all produce matches. Review the percentage together with each passage and its source context.
Document with matches
Matching passages are highlighted and linked to the corresponding sources found.
- Compare each highlighted passage with the original source
- Check direct quotations and paraphrases for appropriate citations
- Assess the reference list and recurring technical language separately from possible source matches
04Sources found
Review matches alongside their sources
Source 01 · 4,2 % Source 02 · 1,8 % Source 03 · 0,7 %
05In three steps
How to check for plagiarism
- 01
Paste text or upload a file
Use plain text or a supported document. Certentis automatically imports available file information, such as the name.
- 02
Let the check run in the background
Source comparison continues in the background. Report history displays active and completed checks automatically.
- 03
Review matches and sources
Open the completed report, examine highlighted passages, and verify whether quotations, paraphrases, and source references fit their context.
06Clear context, not just a score
A plagiarism check that connects matches to sources
The overall percentage is only a starting point. Review each passage, its source, and the context before deciding what requires attention.
See matching passages in context
Matching passages are highlighted so you can review them within your text.
Open each source
Every discovered source remains linked to its matching passages for closer review.
07Control instead of a black box
What Certentis does differently
A match is an indication for review, not proof of plagiarism. Compare the passage with the original source to decide whether it is correctly quoted, properly paraphrased, common knowledge, or problematic.
- 01
The original stays visible
When humanizing, compare the source text with the revised version instead of having to accept an opaque response.
Compare each highlighted passage with the original source
- 02
Probabilities are explained
AI detection is presented as a statistical assessment, not proof of authorship or quality.
Check direct quotations and paraphrases for appropriate citations
- 03
Sources lead to the original
Plagiarism matches remain linked to specific passages and accessible sources.
Assess the reference list and recurring technical language separately from possible source matches
08 · Open evidence
Read the metrics. Review the method. Know the limits.
Certentis separates results, test protocol, and product comparison so it remains clear what was measured and what the test cannot establish.
09Typical use cases
Three situations where this tool can be used
Check term papers and bachelor's theses for plagiarism
Check source material, paraphrases, and direct quotations before submission. The plagiarism checker highlights specific matches and links them to discoverable original sources.
Check reports and publications for plagiarism
Review longer articles and reports, and keep track of reused phrasing and linked external sources.
Check editorial content for plagiarism
Compare drafts with publicly available sources before publishing or sharing content. Use the report to review potential matches in context.
10Clear plans
One balance. Three tools. Total control.
Choose a subscription for regular work or permanent credits for individual projects. Humanizer, AI analysis, and plagiarism reports stay in one workspace.
- 01Shared credits
- For Humanizer, AI analysis, and plagiarism reports. Usage is shown transparently for each tool.
- 02Subscription or one-time
- Fits your work rhythm.
- 03Plagiarism by word
- Each checked word costs one credit.
You’ll see the final total and tax details before purchase in the Stripe checkout.
11Plagiarism checker
Frequently asked questions
More tools