Duplicate Content Checker free of charge: check duplicate content
Free individual check · without registration
Compare two texts or the content extracted from two URLs. The tool measures common sequences of four words each and shows matching text passages. This allows you to investigate overlaps; a plagiarism search does not take place throughout the web.
Results
Understandable example: a changed word
Select “Compare texts” and apply the two passages unchanged in text A and text B.
Text A
Unsere roten Schuhe sind bequem und leicht.Text B
Unsere roten Schuhe sind bequem und günstig.Calculated result
| Issued | Value |
|---|---|
| Similarity of four-word sequences | 60 % |
| Evaluated words in A / B | 7 / 7 |
| Common four-word sequences | 3 |
| A common consequence | Our red shoes are |
Three common consequences face five different consequences in total: 3 ÷ 5 = 60%. This does not mean that 60% of the words are copied. For longer texts and other word sequences, the statement of the value changes.
Created with the given example data and the calculation logic of this tool. The values refer to this example.
How the Similarity Value Is Calculated
The texts are written in lower case, hyphens and underscores are separated and words with at least two characters are adopted. This results in clear sequences of four consecutive words. The similarity value is the number of common sequences divided by the number of all the different sequences of both texts multiplied by 100. Word order and wording greatly influence the result.
Select text mode or URL mode
In text mode, you specifically compare the inserted passages. In URL mode, Seitenreport retrieves both pages without browser rendering and removes scripts and styles, among other things. Navigation, footers and other template texts can still be included in the comparison. If you have striking similarities, copy only the actual main texts into text mode to check this influence.
Derive a decision from an overlap
First, check whether both sides perform the same user task. For two equivalent variants, a suitable canonical or redirect solution can be useful. For stand-alone tasks, content, examples and internal linking should explain these differences. A similar technical vocabulary alone does not justify a merger; the measured value does not determine either plagiarism or Google’s chosen canonical URL.
Questions about use and boundaries
Does the checker search the Internet for copies?
No. He only compares the two transmitted texts or URLs. He does not find any unknown copies on other websites and cannot confirm any worldwide uniqueness.
Does 0% mean that the content is unique?
No common four-word sequences were found using this method. Meaningful rewrites, very short texts and changed word sequences can still have similar content. There are no complete comparison sequences among four evaluated words.
Is 70 percent a Google border?
No. The thresholds for classification come from this tool. Google does not use this published checker value as a general limit. Assess purpose, main content and canonical signals additionally yourself.
Why do word number and my text program not match?
The evaluation counts tokens with at least two characters and treats hyphens and underscores as a separation. A text program can use other rules. Both texts are processed here according to the same method.