Can this tool tell the difference between GPT-3.5 and GPT-4?

The detector identifies general AI writing patterns rather than distinguishing specific model versions. Both GPT-3.5 and GPT-4 output will be flagged if they match known AI writing signals.

What makes ChatGPT text detectable?

ChatGPT text tends to be statistically "smoother" than human writing — it avoids unusual word choices, maintains consistent tone, and follows predictable syntactic patterns. These features create a measurable statistical signature.

Does detecting ChatGPT text violate any privacy rules?

No. You are analyzing text that has been shared with you. FixTools does not store or transmit the text you paste — it is processed entirely in your browser.

Is this the same as Turnitin AI detection?

No. FixTools is a standalone free tool. Turnitin is an institutional platform with its own detection methodology. FixTools is useful for personal checks before submitting to institutional tools.

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Detect ChatGPT Text Online

ChatGPT-generated text has recognizable patterns — uniform sentence flow, neutral tone, and predictable structure. FixTools analyzes these signals and gives you an instant probability score to help determine whether content was created with ChatGPT or another AI model.

⚡ Use Tool Now How it works

Cost: Free forever
Sign-up: Not required
Processing: In your browser
Privacy: Files stay local

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Identifies ChatGPT writing patterns

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Works on GPT-3.5 and GPT-4 output

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Instant detection, no sign-up

AI Tool

AI Content Detector

All processing happens in your browser — your files are never uploaded to any server.

🚀Open AI Content Detector

100% Free · No account · Works on any device

How to use this tool

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Paste the text you want to check for ChatGPT patterns. The tool highlights the most AI-probable sentences and gives an overall confidence score.

How It Works

Step-by-step guide to detect chatgpt text online:

1
Copy the text you want to check
Select and copy the text from the document, email, or webpage you want to analyze.
2
Paste it into the detector
Open FixTools AI Content Detector and paste your text into the input field.
3
Run the ChatGPT detection
Click "Detect" to receive an AI probability score and highlighted sentences.
4
Interpret the results
A high score indicates ChatGPT-like patterns. Combine this with your own reading to assess the content.

Real-world examples

Common situations where this approach makes a real difference:

Online review verification

An e-commerce platform manager checks product reviews flagged by customers as potentially fake or AI-generated.

Agency deliverable check

A marketing director verifies whether articles delivered by a content agency were written by humans as specified in the contract.

News fact-checking

A journalist reviewing a tip or submitted op-ed scans the text to assess whether it originated from AI before investigating further.

When to use this guide

Use this when you specifically suspect ChatGPT was used to generate content you have received — such as a student submission, freelance article, or online review.

Pro tips

Get better results with these expert suggestions:

Look for the "assistant voice" pattern

ChatGPT often writes in a helpful, balanced tone that avoids strong opinions and hedges claims. Text that reads like a FAQ or explainer may score high.

Test with the first few paragraphs

ChatGPT introductions are particularly distinctive — they often start with a definition or broad statement. Focus detection on openings to get a quick read.

Compare before and after editing

If someone claims to have edited AI output, run both the original and edited versions. A significant score drop suggests meaningful human revision.