●Free AI writing check

Free AI Text Detector

Paste writing to check for patterns associated with ChatGPT, Claude, Gemini, and other language models. Get a free probability score before creating an account.

Check Text Free Evidence Types

Check text for AI-generated patterns

Minimum 50 characters

What We Detect

Comprehensive LLM-generated text detection

🤖

GPT Detection

Detect text generated by GPT-4, GPT-3.5, and earlier GPT models

🧠

Claude Detection

Identify Claude-generated text across different versions and styles

✨

Gemini Detection

Detect Google Gemini and Bard-generated content

📝

LLM Patterns

Identify common LLM writing patterns and stylistic markers

🔍

Mixed Content

Detect human-AI hybrid text with confidence estimation per segment

🌐

Multilingual

Language-aware review with performance that can vary by language, domain, and text length

Explainable Evidence

Understand exactly why text was flagged

Evidence Types

✓Perplexity and burstiness scores
✓Stylometric signal analysis
✓Sentence-level confidence bands
✓Linguistic pattern detection

Operational Guidance

⚡Processing time depends on text length and scan mode
📊Batch workflows are available for document collections
🎯Short and heavily edited text requires cautious interpretation

Limitations & Best Practices

Understanding model constraints for optimal results

False Positive Risk

Professional writing, edited text, or short samples may increase false positives.

Adversarial Attacks

Human paraphrasing and AI obfuscation tools may evade detection.

Generalization Bounds

Performance varies by domain and writing style. Best on academic/professional content.

API Integration

Get started in minutes with our unified API

cURL

curl -X POST https://app.zerotrue.app/api/v1/check \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "input": {
      "type": "text",
      "value": "Sample text content"
    },
    "is_private_scan": true,
    "is_deep_scan": false,
    "idempotency_key": "req-123"
  }'

View Full API Documentation

Frequently Asked Questions

Which LLMs can you detect?

The detector evaluates signals associated with major LLM families, but coverage and confidence vary across model versions and editing.

How accurate is text detection?

Accuracy varies with text length, language, model family, paraphrasing, and human editing. Use confidence bands and review limitations.

Can you detect AI-edited text?

Human editing can weaken or change AI-associated signals. Mixed content may still produce indicators, but it needs cautious review.

Does it work on all languages?

Performance varies by language, domain, length, and model family. Test the languages required by your workflow.

Is my text data stored?

Retention can depend on the plan and scan mode. Confirm current retention and deletion requirements before submitting sensitive text.