# Free ChatGPT Detector — GPT-6, GPT-5 & GPT-4

Detect ChatGPT writing free — GPT-6, GPT-5 and GPT-4. Paste text and get a 0-100 score with the machine-written lines marked and the reasons explained.

- Source: https://scanforai.com/detect-chatgpt
- ScanForAI — AI-writing detection. A score is a signal, not a verdict.

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# Can ChatGPT and GPT‑6 writing be detected?

Usually — when it's pasted unedited. ChatGPT is the most-used writing model on earth, and GPT-6 kept the habits that give it away, just as GPT-5 did, so its default voice is still the most recognisable. Here's what gives it away, what a paraphraser changes, and what no tool can honestly claim.

## What ChatGPT writing tends to sound like.

No single word proves anything — it's the pattern. These are the habits our scanner weighs when ChatGPT-style text comes through:

### Balanced-everything structure

Tidy intro, three even points, a wrap-up that restates them. Every paragraph the same shape.

### Stock transitions

Furthermore, moreover, in conclusion — connective tissue people rarely type.

### Confident generality

Fluent sentences that commit to nothing specific — no names, numbers or lived details.

### Polished evenness

Sentences of near-identical length, marching in rhythm. People burst; models hum.

**A person.** Long thought, short one. Punch.

**A model.** Same-length sentences, marching in step.

ChatGPT's evenness is the easiest tell to see with the naked eye. The scanner measures it across every paragraph.

## The scanner shows you, sentence by sentence.

Paste a draft and the AI-leaning lines get marked right in your text. Here's the kind of thing that lights up:

## Can any tool prove it was ChatGPT?

No — and be wary of tools that say otherwise. What a detector reads is a *style family*, not a brand label. ChatGPT's voice is also the most imitated: it trained a generation of "AI-sounding" text, and old GPT output is still pasted around the web every day. So ScanForAI answers the useful question instead — **how much** of this text reads machine-written, and **which lines** — including when a document mixes human and AI parts.

#### Try it on a real draft

Paste a suspect draft and read the marked lines — you'll see *which parts* carry the machine voice, not a yes/no stamp.

Nothing is stored on anonymous scans.

## What people actually ask.

Partly. Paraphrasers swap words but usually keep the machine skeleton — even sentence rhythm, balanced structure, generic content. Scores drop, but heavily-paraphrased text often still reads elevated. Genuine human editing (cutting, reordering, adding specifics) changes the score far more than synonym-swapping.

No. OpenAI has researched text watermarking but has not shipped a public one, and there is no hidden tag in ChatGPT output you can look up. All ChatGPT detection — ours included — is statistical: it reads writing patterns, which is why results are evidence, not proof.

Turnitin has its own AI-writing indicator, and like every detector it's contested — schools have seen both misses and false flags, which is why many institutions tell staff not to treat it as proof. If Turnitin flagged your work, scan it here as a documented second opinion and bring the per-line breakdown to the conversation.

Often, yes — from the writing itself (sudden style shifts, vocabulary you've never used in class) as much as from any tool. If your course allows AI drafting, edit until the text genuinely carries your voice; our scanner shows which lines still don't.

This one — paste up to 20,000 characters anonymously, free, nothing stored. A free account raises the limit to 50,000 and adds the full pattern breakdown, deep analysis, batch scanning and history.