How accurate is the check?

The detector is highly accurate for unedited AI output and less certain for heavily edited or humanized AI text. Results should be treated as a strong probabilistic signal, not a definitive verdict.

Can it detect AI writing in opinion or editorial articles?

Yes, though opinion pieces with strong personal voice may score lower even if AI-assisted. The most reliable detection is on informational or descriptive content.

What if the article is behind a paywall?

You can only check text you have access to. If you have a subscription to the publication, copy the article text. The tool cannot scrape paywalled content.

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Check If an Article Was Written by AI

Across the web, AI-generated articles are increasingly indistinguishable at a glance from human-written ones. FixTools lets you paste any article and receive an objective AI probability score — so you can make informed decisions about whether to trust, publish, or pay for the content.

⚡ Use Tool Now How it works

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

⚡

Paste any article for instant analysis

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Section-level AI probability scoring

✨

Works on long-form articles

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 article text. You will receive an overall AI probability score and section highlights showing which parts are most likely AI-generated.

How It Works

Step-by-step guide to check if an article was written by ai:

1
Copy the article text
Select and copy the article body from the source document or web page.
2
Paste into the AI detector
Open FixTools AI Content Detector and paste the text.
3
Receive the AI probability score
Review the overall score and highlighted sections to understand which parts of the article are most AI-probable.
4
Make an informed decision
Use the result to decide whether to publish, return for revision, or investigate further.

Real-world examples

Common situations where this approach makes a real difference:

Content buyer verification

A content buyer on a marketplace platform checks articles they received before approving and publishing them on their website.

Media literacy research

A researcher studying the prevalence of AI content online samples articles from various news aggregators and checks each one for AI patterns.

Publisher contributor vetting

An online magazine editor checks articles submitted through an open contributor portal before forwarding to the editorial team.

When to use this guide

Use this when you encounter an article of uncertain origin — whether from a freelancer, a content service, or an unfamiliar website — and want a quick, data-driven answer before relying on it.

Pro tips

Get better results with these expert suggestions:

Check the byline against the writing style

If a known author's article scores unusually high for AI, compare it to their earlier work. A sudden jump in writing quality or shift in voice is a secondary signal worth investigating.

Focus on transitions and conclusions

AI-generated articles often have the weakest originality in conclusion paragraphs, which tend to be generic summaries. Run these sections through separately if results are borderline.

Combine AI detection with originality search

Use the AI detector alongside the Plagiarism Checker to get a complete picture of an article's authenticity — both whether it was AI-generated and whether it was copied.