GPTDetect.aiAI text detector that flags content likely generated by GPT and other large language models.

4.7 (6)

Reviewed by Daniel Nikulshyn·Updated July 2026

Overview

GPTDetect.ai is an online detection tool designed to analyze written text and estimate the likelihood that it was produced by an AI system such as ChatGPT or similar large language models. Users paste or upload content and receive a probability score along with highlighted sections that appear machine-generated. The service is aimed at educators, editors, recruiters, and content teams who need a quick way to vet submissions for authenticity. It works across short snippets and longer documents, making it useful for essays, articles, emails, and applications. As with any AI detector, results are probabilistic rather than definitive, and should be treated as one signal among several when evaluating the origin of a piece of writing.

Key features

AI-generated text probability scoring
Sentence-level highlighting of flagged content
Support for long-form documents
Browser-based interface, no install needed
Works on output from popular LLMs
Suitable for academic and professional review

Pricing

Model: Free
Category: Content Creation
Rating: 4.7 / 5 (6)

Use cases

Academic Integrity

Detect AI-generated essays, research papers, and assignments to maintain academic integrity and prevent plagiarism.

Content Verification

Use GPTDetect AI Text Detector to verify the authenticity of content, such as blog posts, articles, and marketing copy.

Intellectual Property Protection

Protect your intellectual property by identifying AI-generated content that may infringe on your rights.

Writing Refinement

Improve the quality of AI-generated content by detecting and correcting weak spots, making it more natural and fluent.

Pros & Cons

Pros

Fast analysis of pasted or uploaded text
Probability score with highlighted suspect passages
Useful for educators and content reviewers
Simple browser-based workflow

Cons

Detection is probabilistic and can produce false positives
Accuracy drops on edited or paraphrased AI text
Short inputs may yield unreliable verdicts

Reviews

4.7

Average from 6 ratings.

Linda Petersen

Apr 10, 2026

Compared a few options

Evaluated this against two competitors. Where it wins: works on output from popular LLMs and probability score with highlighted suspect passages. Where it lags: short inputs may yield unreliable verdicts. On balance the feature set — especially sentence-level highlighting of flagged content — justifies the 4 stars for our use case.

Esther Adeyemi

Mar 19, 2026

Use it every day

Honestly didn't expect to like it this much. Works on output from popular LLMs is exactly what I needed, and simple browser-based workflow. I do wish short inputs may yield unreliable verdicts, but I reach for it almost every day now and it just clicks.

Jamal Carter

Mar 4, 2026

Years in this space

I've evaluated a lot of these over the years. What stands out here is works on output from popular LLMs — handled better than most — and simple browser-based workflow. Worth the time if this is your use case.

Mei-Ling Wong

Nov 3, 2025

Years in this space

I've evaluated a lot of these over the years. What stands out here is aI-generated text probability scoring — handled better than most — and useful for educators and content reviewers. Short inputs may yield unreliable verdicts is my one real gripe. Worth the time if this is your use case.

Grace Okafor

Oct 8, 2025

Years in this space

I've evaluated a lot of these over the years. What stands out here is browser-based interface, no install needed — handled better than most — and useful for educators and content reviewers. Short inputs may yield unreliable verdicts is my one real gripe. Worth the time if this is your use case.

Olga Ivanova

Oct 7, 2025

Skeptical, then convinced

I went in skeptical — most tools in this space overpromise. It actually delivers on aI-generated text probability scoring, and fast analysis of pasted or uploaded text caught me off guard. still, I'd recommend giving it a real trial.