Now that AI tools like ChatGPT and Claude can write for us, there’s a new challenge — creating content that sounds human and doesn't get penalized by SEO algorithms.
Humanizing AI content is important for blog posts, marketing copy, essays — any kind of written material that you publish online. Later in the article we’re going to see what can happen if you don’t.
But first, we’ll look at ways to test your writing, and most importantly — ways to make it undetectable by AI-checkers.
Let’s start by establishing a baseline — what do we consider AI generated?
What is AI-generated text?
When we say AI-generated, we’re talking about any text that has been:
- Written by a chatbot, like ChatGPT
- Edited by a chatbot
- Translated by a chatbot
- Rephrased by a chatbot
Yes, even rephrasing, editing, or translating copy that you’ve written yourself can cause AI detectors, like GPTZero, Originality.ai, or Turnitin to increase their AI score. This, presumably, is also true for Google’s algorithm that determines SERP rankings.
How is AI-Generated Text detected?
AI detectors are trained to recognize text patterns that don’t match how humans write. In particular, they look at two things:
- Perplexity
- Burstiness
Perplexity is how predictable a piece of writing is. The lower the perplexity, the more predictable the text, which usually means AI wrote it. High perplexity equals more variety and complexity — typical for human writing.
Burstiness measures the variety in sentence length and structure. Humans mix long and short sentences. AI tends to write in parallel structures.
When your content has low perplexity and low burstiness, it gets flagged. So your goal is to raise both by making your writing less predictable and more varied.
Besides that, AI detectors also look at:
- Word choice: AI tools use very flowery language Humans use slang, idioms, or words based on personal style or mood.
- Repetition: AI chatbots like to explain the same idea multiple times in slightly different ways.
- Lack of originality: AI-generated is usually factually correct, but lacks opinions, insight, or biased statements that humans tend to make.
Common Mistakes That Make AI Content Detectable
1. Asking AI to Write a Text from Scratch
When you give AI a prompt like "Write a 1,000-word blog post about the benefits of remote work" and then copy-paste the result directly, you’re almost guaranteed to get flagged by AI detectors.
That’s because the AI will almost certainly generate the first with very low perplexity and very low burstiness. You can improve the first draft a lot with subsequent prompts, which we’ll see an example of later.
Fix: Use AI to create a first draft or outline. Then rewrite it yourself or an AI humanizer.
2. Not Checking Content Edited by AI
It can seem like a great idea to ask an AI chatbot to improve the flow or grammar of a piece. Unfortunately, there’s a high chance that this will actually make the AI score go up.
The chatbot most probably will adjust tone or vocabulary slightly, and introduce the same patterns that detectors recognize. You might think it’s better, but the changes are often superficial.
Fix: If you’re using AI to revise, always follow up with a manual review or use a proper humanizer (like Overchat or a rewrite from scratch). At the very least, run the final version through a detector to see what needs more work.
3. Not Checking for AI Detection Scores Before Publishing
Don’t assume that if it sounds good, it’s undetectable by AI checkers. Remember, these tools don’t judge text based on fluidity — they evaluate typical AI patterns. Which may or may not be present in your writing.
Fix: Always check your content before publishing—especially if you're using AI for work, client projects, or SEO. If it scores high on the AI scale, rewrite the flagged sections. Or use a good humanizer.
4. Overusing Transitions and Perfect Formatting
AI chatbots typically add these phrases:
- “In conclusion…”
- “Firstly, secondly, thirdly…”
- “Furthermore,” “Moreover,” and “In addition”
These are perfectly valid transitions, and they often improve fluidity. However, AI, unfortunately, oversuses them. As a result, they’re one of the first things that will make an AI score go up.
Fix: Sacrifice fluidity. Break the rhythm. Write in short bursts. Like in traditional SEO, this is another situation where we have to compromise to appease the algorithm.
How to See If Your AI Content Is Detectable
To see if your content gets flagged by AI detectors, use one of the free online tools:
- Originality.ai. This tool can detect GPT 4o, GPT 4.5, Claude Sonnet 3.7, DeepSeek, and other models. It gives you a percentage score from 0% to 100% showing how likely your text is AI-generated.
- GPTZero. Originally built for schools, this tool is now widely used by professionals. It highlights which sections of your text seem “most likely AI” and gives you an overall score.
- CopyLeaks. The Copyleaks team claims that their algorithm is accurate in 99% of cases. The tool supports over 30 languages, and covers ChatGPT, Gemini, and Claude, among others. Support for new models gets added as they’re released.
Simply paste your text and run the scan:
How to interpret the results
The good news — you don’t need to achieve a 0% AI score (or 100% human score). Developers know that these tools aren’t perfect, so a margin of error is allowed. As a general rule of thumb:
- 0%–30% AI score means that the content probably reads as human, you can leave it as is.
- 30%–60% AI score means that you need to rewrite the most awkward parts, but there’s no need to rework it completely.
- 60%+ AI score means that the content is definitely AI-written. Rework it heavily.
Some tools also show which parts got flagged and, though this is usually a paid feature. If you have access to this data, you can rework only the highlighted parts.
How to Make AI Content Undetectable
You can:
- Use Overchat AI Humanizer
- Ask ChatGPT to Rewrite AI-Generated Content
- Edit it yourself
Use Overchat AI Humanizer
Overchat AI humanizer is our tool, designed to make AI-generated text sound like it was written by a human. It’s trained on examples of real human writing. This tool is specifically designed to modify structure, tone, rhythm, and unpredictability — things AI detectors look for.
To humanize text in Overchat AI, simply paste your content into the chatbot and press enter.
Ask ChatGPT to Rewrite AI-Generated Content
You can use ChatGPT to humanize its own writing. Simple as it: “Please, rewrite this paragraph.” After a second round of writing the output is likely to have a higher perplexity. You may need to even repeat this process multiple times.
Edit it yourself
There are “cheat” tricks you can use:
- Replace and with &
- Deliberately add small punctuation inconsistencies
- Add idioms
- Use a few slang words
- Use contractions: you’re, it’s
- Remove a few adjectives, like crucial, impressive
Before:
After:
Bottom line: you don’t need to rewrite everything — but editing even small parts with intention makes your AI content far less detectable.
Why You Should Make AI Content Undetectable
In March 2024, Google released an algorithm update designed to penalize spammy, low-quality content. Since then, updates have continued to roll out with new ways to identify auto-generated text.
1. Better SEO
If your content is flagged as auto-generated, it can mean:
- Lower rankings. Google may push your page down in search results, even if it’s technically accurate.
- Loss of traffic. If your content drops off page one, you lose most of your organic visibility.
- Deindexing. In extreme cases, your pages may be removed entirely from Google’s index.
Even if you’re not “caught” right away, algorithm updates can hurt AI-heavy sites later.
Content that’s not flagged as auto-generated, on the other hand, is more likely to be included on the first page, where over 90% of all clicks take place.
2. Better engagement
Readers who spot AI-generated content are likely to perceive the text as low value. This way you can lose engagement, which is one of the key metrics Google uses to rank content. As such content that has a high bounce rate and low time-on-page is likely to move to lower positions in SEPR.
On the other hand, content with personal insights and opinions is more likely to interest readers. They’ll stick around for longer, which tells. Google that your content is valuable.
3. Set yourself apart
There’s no shortage of AI-written content online right now. The majority of it sounds the same: formal, padded, and bland. If you want your content to stand out, it can’t sound like everything else. If your content blends in, it doesn’t get clicked, shared, or remembered. Which means it doesn’t convert, build authority, or grow your brand.
Let’s Recap the Main Points
Most writers in 2025 will probably use some kind of AI aid, and that’s not a bad thing. What's more, AI content can be used safely, as long as you keep these points in mind:
- AI detectors are improving. Tools like Originality.ai and GPTZero analyze sentence structure, word patterns, and predictability.
- Most detectable content comes from user error. The biggest mistake is using AI without editing, not checking content after AI edits, or publishing without checking — false positives do happen.
- There are real risks. You could lose rankings and damage your SEO. Sometimes, irreparably.
- You can make AI content undetectable. Use tools like Overchat, rewrite with smarter prompts, and edit manually to break up robotic phrasing and predictable structure.