Our expertise :
Detect hidden plagiarism with Compilatio's altered text detector

Spot text transformations, invisible to the naked eye, designed to hide plagiarism and AI content.


Some writers are sometimes tempted to manipulate texts to bypass detection software. It is therefore vital to detect all forms of cheating, including attempts to cover up plagiarism and AI content.

Compilatio's software highlights passages where the language is not recognised, which are often indicative of an attempt at dissimulation.

hidden plagiarism

What is a text alteration detector?

This is a tool for automatic detection of plagiarism and potentially hidden AI content. It highlights attempts to alter texts in order to prevent detection. 

  • The aim: to detect attempts to hide plagiarism.

In principle, text alteration involves manipulating content in such a way that the changes are invisible to the naked eye. Compilatio detection software is able to detect these changes.

Two common examples of text alteration: 

  1. use of white characters: the writer replaces spaces between words with invisible white characters,
  2. character substitution: the writer replaces certain characters with characters from different alphabets that look similar. For example: replacing the letter "P" with the Greek letter Rhô "Ρ".
altered text detector

How does it work technically? 

The altered text detector analyses content to detect any anomalies. The linguistic and semantic relationships between words are studied to determine the language of the text and identify passages whose syntax deviates from the base language. This highlights any suspicious strings of characters.

⚠️ A high percentage of texts in an unrecognised language does not necessarily mean that the author has cheated. It is necessary to carry out an additional examination of suspect passages before passing judgement.

obfuscation detector
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How are altered texts displayed in Compilatio analysis reports?

Compilatio analysis reports give access to a percentage of suspect texts in the document, broken down into several separate indicators: percentage of similarities, percentage of texts potentially generated by AI and percentage of language not recognised (the one we are explaining in this page).

In Compilatio software, the percentage of unrecognised languages is represented by the above pictogram "modification warning sign".

undetectable plagiarism

A summary that displays the percentage of altered texts

In Compilatio interfaces, the percentage of potentially altered texts corresponds to the percentage of language not recognised. This percentage is quickly displayed in the "Summary" tab of the Compilatio analysis report.

hide plagiarism

Document details displaying passages in an unrecognised language

In Compilatio interfaces, passages in an unrecognised language are highlighted in the "Full text" tab for a more precise view of the texts concerned.

Text alteration detection is available for users of the following packages: Compilatio Magister, Compilatio Magister+, Compilatio CopyrightCompilatio Copyright+.

Why choose Compilatio for text alteration detection?

text manipulation
20 years' experience in plagiarism detection

More than 1000 institutions have received support and millions of students around the world have been sensitized.

detect hidden plagiarism
Advanced technology

Compilatio is an expert in natural language processing. This enables us to offer reliable, secure and interoperable software.

anti-plagiarism support for academic integrity
Tailor-made support

Compilatio provides teachers, students and editorial professionals with real, ongoing support.

Detecting altered texts: for whom?

We can help you detect plagiarism and AI content.
For teachers
Magister and Magister +

Compilatio Magister and Compilatio Magister+: detect altered texts, similarities and AI content to raise awareness among your students.

For editors
Copyright and Copyright+

Compilatio Copyright and Copyright+: comprehensive anti-plagiarism programmes for editorial and publishing professionals.

They trust us
University Paris Cité
Aix Marseille Université
Université de Genève
Université Paris 1 Panthéon-Sorbonne
Università degli Studi di Bologna
Universidad Técnica Federico Santa María
Politecnico di Torino
ESTA Belfort
IUSTO
Collège Montmorency
Institut PREPAVOGT
UCBL
Universidad de Castilla - La Mancha
University of Fribourg
Università degli Studi di Padova
Universidad Iberoamericana León