See exactly which sentences read as AI
Not a single blunt score. A fine-tuned three-class model reads every sentence on its own — flagging raw AI-generated text and AI-paraphrased writing — then rolls it up into one document verdict you can defend.
- Paste or PDF/DOCX ≤ 20 MB
- Per-sentence probability
- Free plan included
The rapid advancement of artificial intelligence has fundamentally transformed the landscape of academic research.99.4%
Furthermore, the integration of machine learning methodologies facilitates unprecedented analytical capabilities.99.1%
Our lab measured the effect across three cohorts between 2021 and 2023.
This paradigm shift necessitates a comprehensive reevaluation of established frameworks.94.8%
Composition
four-stage pipeline
- 3-class
- Human · AI-generated · AI-paraphrased
- ≤ 20 MB
- PDF & DOCX, or paste raw text
- Per sentence
- Individual probability on every line
- Background
- Long documents run as tracked jobs
// sentence-level evidence
Evidence, sentence by sentence
Every sentence is classified on its own and highlighted by class — so a reviewer can see precisely which lines were flagged, and why, instead of trusting one opaque percentage.
AI-generated
Reads as raw output from a large language model.
AI-paraphrased
AI text revised by a paraphraser or word-spinner.
Human
Consistent with organic human writing — left unmarked.
The rapid advancement of artificial intelligence has fundamentally transformed the landscape of academic research.99.4%
Furthermore, the integration of machine learning methodologies facilitates unprecedented analytical capabilities.99.1%
Our lab measured the effect across three cohorts between 2021 and 2023.
This paradigm shift necessitates a comprehensive reevaluation of established frameworks.94.8%
Selected sentence
probability 99.2%class AI-paraphrased18 words
// document verdict
One clear verdict, banded by threshold
Per-sentence probabilities roll up into a single word-weighted document score, mapped to one of three plain-language verdicts.
Essentially Human
The document reads as organic human writing.
Moderately AI
A meaningful share of sentences look AI-written.
Highly AI
Most of the document is flagged as AI.
// how it runs
From upload to shareable report
Long documents run as tracked background jobs through a four-stage pipeline — leave the page and a live pill tells you the moment results are ready.
- 01
Extract
Clean text is pulled from your PDF or DOCX — or taken as pasted text — then split into sentences, skipping references, headers and tables.
manuscript-draft.pdf
142 sentences extracted
- 02
Detect
The fine-tuned three-class model scores each sentence — human, AI-generated or AI-paraphrased — with its own probability.
72.6%Document AI % - 03
Similarity
Optionally, each passage is cross-checked against live academic databases for DOI-linked source overlap. See the Similarity check →
- Chen et al. — Learning Analytics8.4%
- Osei & Park — AI in Education6.1%
- 04
Report
Download the highlighted PDF and replay the full interactive result any time — every run is saved to your history automatically.
Downloadhighlighted-report.pdf
highlights · scores · sources
// FAQ
Questions, answered
Everything about how the AI Detector reads your document.
Instead of one blunt percentage, every sentence is classified on its own — human, AI-generated or AI-paraphrased — and highlighted by class. The per-sentence probabilities then roll up into a word-weighted document verdict, so you can see exactly which lines drove the result.
// start detecting
Run your first document free
Paste text or drop a PDF and get a sentence-level breakdown in minutes. No card required.