AI Detector and Humanizer: How to Use Both Together (2025)

Using an AI detector and humanizer together is the gold standard workflow for making AI-generated content undetectable. This guide explains exactly how to do it — and which free tools to use.

Why You Need Both an AI Detector and an AI Humanizer

An AI humanizer rewrites your text to sound more human. But how do you know it worked? That is where an AI detector comes in.

The process is simple:

1. Generate content with an AI tool (ChatGPT, Claude, etc.)
2. Detect — run it through an AI detector to see your baseline AI score
3. Humanize — use an AI humanizer to rewrite the content
4. Detect again — verify the score has dropped to an acceptable level
5. Repeat if needed — some content requires two or three humanization passes

Without the detection step, you are humanizing blind. You might publish content that still flags as 90% AI.

Best Free AI Detector Tools

1. GPTZero (Free)

GPTZero is the most widely used free AI detector. It gives you a percentage score and highlights specific sentences flagged as AI-generated.

• Accuracy: High for ChatGPT and GPT-4 content
• Free tier: Up to 5,000 characters per check
• Best for: Verifying humanized content before publishing

2. Grammarly AI Detection (Free with Grammarly)

Grammarly now includes AI detection in its free plan. It integrates directly into your writing workflow.

• Accuracy: Good for general AI content
• Free tier: Available in Grammarly free plan
• Best for: Writers who already use Grammarly

3. Originality.ai (Paid)

The most accurate AI detector, favored by publishers and content agencies. Not free, but worth it if accuracy is critical.

4. ZeroGPT (Free)

A free, no-signup AI detector that works for quick checks.

Best Free AI Humanizer Tools

1. ChimpWrite Free AI Humanizer

Our free AI humanizer tool lets you humanize up to 500 words with no account required. Fast, simple, and effective for GPTZero bypass.

2. QuillBot Humanizer

QuillBot's fluency mode is excellent for humanizing shorter AI content. The free tier gives you 125 words per paraphrase.

3. Undetectable AI (Trial)

The most powerful humanizer available. Essential if you need Turnitin bypass. Free trial available.

The Complete AI Detector and Humanizer Workflow

Step 1: Generate Your Content

Write your content using ChatGPT, Claude, or another AI tool. Do not publish raw AI output — it almost always flags at 90%+ AI.

Step 2: Run Through GPTZero First

Paste your content into GPTZero before humanizing. Note your baseline score. Anything above 80% AI needs humanization.

Step 3: Humanize the Content

Paste into your preferred humanizer:

• For short content (under 500 words): Use ChimpWrite Free Tool
• For best quality: Use QuillBot Fluency mode
• For Turnitin bypass: Use Undetectable AI

Step 4: Verify the Result

Run the humanized output back through GPTZero. Target a score below 20% AI for general publishing. For academic submission, aim for below 10%.

Step 5: Human Review

Always read the humanized content yourself. Check that:

• The meaning is preserved accurately
• No facts have been changed
• The tone fits your audience
• No awkward phrasing was introduced

Step 6: Repeat if Needed

If the score is still high, humanize again. Most content reaches acceptable levels within two passes.

Common Mistakes to Avoid

Humanizing without detecting first — Always establish a baseline score. You need to know what you are working with before and after.

Using the wrong tool for your detector — Not all humanizers bypass all detectors equally. If Turnitin is your target detector, you need Undetectable AI — not just any free humanizer.

Publishing without a final review — AI humanizers can change facts, introduce awkward phrasing, or simplify important nuances. Always read the final output before publishing.

Over-humanizing — Running content through three or four humanizer passes can make it sound unnatural. Two passes is usually the maximum.

Free AI Detector and Humanizer Tools Compared

Bottom Line

The best results come from combining a reliable AI detector for verification with a quality AI humanizer for rewriting. Use GPTZero to check before and after, and our free AI humanizer tool or QuillBot for the rewriting step.

For serious Turnitin bypass, invest in Undetectable AI — no free tool matches it for academic detection bypass.