Paste text from ChatGPT, Claude or Gemini, rewrite it with the sentence-level variation GPTZero looks for, then read the built-in AI score before you submit anything.
No card required. Free to try.
Turn AI drafts into clear, natural writing
Refine mode keeps your meaning but improves tone, flow, and clarity.
Paste your AI-generated or rough draft here…
💡 Tip: Press Ctrl+V to paste or drag & drop a .txt file
How it works
Drop in an AI-assisted draft or a passage of your own that GPTZero flagged. Leave direct quotes out, or check them after the rewrite.
PureWrite rebuilds sentences rather than swapping synonyms, so sentence length, structure and word choice vary the way a person's do.
Read the built-in AI score on the result. If one paragraph still reads flat, run it again or edit it by hand before you paste it into GPTZero.
GPTZero (gptzero.me) is a detector. It scores text; it does not rewrite it. ZeroGPT (zerogpt.com) is a different company that sells both a detector and a humanizer, which is why searches for a "GPTZero humanizer" land on both sites. If you want a rewrite that holds up in GPTZero, you need a separate tool, then GPTZero (or a detector like ours) to check it.
If ZeroGPT is the detector you actually face, the ZeroGPT humanizer page covers how its scoring differs.
GPTZero's original model rested on two statistics. Perplexity is how surprised a language model is by each next word: AI text picks the likely word again and again, so perplexity stays low. Burstiness is how much that surprise, and the sentence shape, varies across a passage. People write a long sentence, then a short one, then a fragment. Models keep an even beat. GPTZero now layers a trained classifier on top, but those two signals still explain most of what it reacts to.
You can see the difference without a detector. Below are two versions of the same paragraph. The bars show words per sentence, and the spread is the standard deviation, computed from the text on this page.
Climate change poses significant challenges to global food security. Rising temperatures can reduce crop yields in many regions of the world. Changes in rainfall patterns can also affect agricultural productivity. Farmers must adapt their practices to address these evolving conditions. Governments and organizations play a crucial role in supporting these efforts.
Heat is already costing farmers harvests. In parts of South Asia, a single week above 40°C during flowering can wipe out a wheat crop that looked fine in March, and rain that arrives in two violent bursts instead of a steady season does almost as much damage. So farmers adapt. Some switch seed varieties, some plant earlier, and a few give up on the crop entirely. None of it works without help from the people who set prices and fund research.
The AI version is five sentences of nearly identical length, each a general claim with no specifics. The rewrite mixes a short opener, a long sentence carrying concrete detail, a three-word sentence and a list. That spread, plus less predictable word choice, is what moves a GPTZero score.
GPTZero reports a document-level verdict (AI, mixed or human, with a probability) and highlights the sentences that drove it. "Mixed" usually means some paragraphs read as human and others do not, so fix the highlighted sentences instead of rewriting the whole piece.
GPTZero now tries to catch text that was generated by AI and then run through a paraphraser or humanizer. Its support documentation describes this as a separate flag that only shows when the model is fairly confident. It also highlights stock AI phrases such as "delve", "tapestry" and "it's worth noting". Our list of common AI words covers the usual offenders.
This is why synonym swappers get caught. Replacing "significant" with "substantial" leaves every sentence the same length and in the same order, so the statistical shape survives. A paraphraser that only works at the word level also tends to produce awkward phrasing that a trained classifier learns to spot. PureWrite rewrites at the sentence and paragraph level: it changes structure, rhythm and emphasis, and keeps your argument. See how that compares with QuillBot on PureWrite vs QuillBot.
Most humanizer pages show one screenshot with a perfect score. That proves little, because GPTZero updates its model often and scores swing with length and topic. If you are choosing a tool, run your own test across the kinds of writing you actually hand in. This is the protocol we use:
| Sample | Length | What to watch in GPTZero |
|---|---|---|
| Essay introduction | 150 to 250 words | Thesis sentence still says the same thing after the rewrite |
| Lab report discussion | 250 to 400 words | Numbers, units and technical terms unchanged |
| Reflection paper | 200 to 300 words | First person stays first person; no invented experiences |
| History DBQ paragraph | 200 to 350 words | Quoted documents untouched, citations in place |
| Business memo | 150 to 250 words | Tone stays professional; bullet structure survives |
Run each sample through GPTZero before and after, on the same day, and note the date and the document-level result. Detector models change, so a result from three months ago is not evidence about today.
Check the meaning too. A rewrite that clears a detector but changes your claims is worse than useless. Our AI detector gives you a quick read between runs, and the free AI detector page explains how to read its score.
| Detector | Who runs it | What you see | Humanizer page |
|---|---|---|---|
| GPTZero | Students and teachers checking work directly | AI, mixed or human verdict with highlighted sentences | This page |
| ZeroGPT | Anyone with a browser; free web checker | A single AI percentage with highlighted sentences | ZeroGPT humanizer |
| Turnitin | Schools, inside the submission portal | An AI percentage only your instructor sees, plus a humanizer-detection category | Turnitin AI humanizer |
| Copyleaks | Schools via LMS plugins, publishers, HR | AI content verdict with highlights, plus a separate plagiarism scan | Copyleaks humanizer |
PureWrite is designed to pass Turnitin, GPTZero, ZeroGPT, Originality.ai and Copyleaks, but no tool can promise how a third-party detector will score a given text. Detectors also disagree with each other, which our guide on whether AI detectors are accurate walks through.
Use it responsibly
Use PureWrite on your own drafts and on AI-assisted writing your course or employer allows. If your syllabus bans AI, a humanizer does not change that. Our ethical use policy spells out where we draw the line, and the guide to humanizing AI text covers the editing you should still do yourself.
Pure Write Team
Updated October 2026
Why trust this guide
We build both sides of this problem: a humanizer that rewrites AI text and an AI detector that scores it. That means every guide here is written by the same team that tunes the engine against the patterns AI detectors flag, so the advice reflects what actually passes today, not last year.
FAQ
Sometimes. GPTZero has a dedicated check for AI text that was run through a paraphraser or humanizer, and word-level synonym swaps are the easiest thing for it to catch. A rewrite that changes sentence structure and rhythm holds up much better, but no humanizer can promise a specific GPTZero score, so check the result before you rely on it.
More free tools
Comparing AI humanizers? See PureWrite vs Undetectable AI, QuillBot, StealthGPT, WriteHuman, Walter Writes, Humbot, GPTinf and NaturalWrite, or browse all AI humanizer alternatives.
Unlock the full result
Grab the Essay Pack (30,000 words) for $10.99 with no subscription, or go Pro for $9.99 a month for long papers, run history and every mode.
Cancel anytime. No card needed for the free try above.
Paste a paragraph, rewrite it, and read the built-in AI score before it goes anywhere near GPTZero.
No card required. Free to try.