The best AI humanizers in 2026, compared on what you can check
The best AI humanizers in 2026 are IsThisAiWritten's free AI humanizer, Grammarly's AI Humanizer and Clever AI Humanizer. Ours is listed first because it is our own tool and the only one in this comparison that is free with no sign-up, no word limit and no upload: the rewriting happens in your browser. Grammarly is the pick if you want rewrites in your own voice, and Clever AI Humanizer gives the most free words per request among server-based tools. Most other humanizers offer a few hundred free words, several keep or train on what you paste, and some promise results against detectors that nobody outside can check. This guide compares them on what you can verify.
Quick picks. Free, private and unlimited: IsThisAiWritten, the only tool here that rewrites on your own device. Rewrites in your own voice: Grammarly, with a custom voice built from a sample of your writing. Most free words per request on a server: Clever AI Humanizer, up to 3,000 words with no account. Already paying for a paraphraser: QuillBot.
The best AI humanizers compared
What each humanizer offered at the time of writing (November 2026).
| Humanizer | Free allowance | Paid from | Your text | What it says about detectors |
|---|---|---|---|---|
| IsThisAiWritten | No word limit, no daily cap, no account | Free | Never uploaded, stored or used for training | Rewrites for readability; makes no detector promises |
| Grammarly | Basic humanizer free; voices need a free account | Pro (price not on the page) | Used for training unless you switch it off | Says it is not meant to bypass detectors |
| Clever AI Humanizer | Up to 3,000 words per request, no account | Free | Stored in your history if signed in | No bypass claims |
| QuillBot | 100 words per request | $8.33 a month, billed yearly | Used for training by default, with an opt-out | Shows a "human score"; no bypass claim |
| Netus | 500 words a month | $14 a month | Not used for training; sent to AI providers | No claim on the pricing page |
| WriteHuman | 3 requests a month, 250 words each | $12 a month, billed yearly | Used for training, no opt-out | Model "updated for GPTZero and Pangram" |
| Walter Writes | 300-word trial | $8 a month | Policy doesn't say | Calls its output "detection-proof" |
| Undetectable AI | 250-word trial | $5 a month, billed yearly | Policy doesn't say | "Passes AI detectors", refund if flagged |
1. IsThisAiWritten
Best for: a free, private rewrite of anything from a paragraph to a whole dissertation.
This is our own tool. The AI humanizer is free, with no sign-up, no credits, no daily cap and no word limit. It runs in your browser, so your text never leaves your device and is never stored, shared or used for training. Quick mode rewrites the habits research ties to chatbot writing: AI-favoured words, stock phrases, filler openers, tacked-on "-ing" clauses and long, even sentences.
- Pro: numbers, quotations, citations and links are never changed, and you can lock any other terms.
- Pro: every change is marked word by word, so you keep what sounds like you and nothing changes behind your back.
- Pro: Everyday and Academic styles, and a one-click check in our free AI detector.
Why it stands out: it is the only humanizer in this comparison that is free, needs no account, has no word limit and never uploads your text.
2. Grammarly AI Humanizer
Best for: rewrites in your own voice, if you already write with Grammarly.
Grammarly's basic humanizer is free without an account. A free account unlocks its Humanizer agent, with four preset voices and a custom voice built from a sample of your writing. Grammarly states plainly that the tool is not intended to bypass AI detectors, and it warns that using a humanizer to hide AI use where disclosure is required could count as cheating.
- Pro: the custom voice is the closest thing to "sounds like me" among the tools here.
- Pro: honest about what a humanizer is for.
- Con: Grammarly's privacy policy lets it use your content to train models unless you switch this off.
3. Clever AI Humanizer
Best for: long free rewrites on a server, without an account.
Clever AI Humanizer is free, with up to 3,000 words per request and no sign-up. It works in English, Spanish and Portuguese, and makes no claims about getting past detectors. The site warns that requests can exceed its available processing capacity for the day, so free use depends on demand.
- Pro: the largest free request size among the server-based tools we checked.
- Con: your text is processed on its servers, and texts are stored in your history when you sign in.
4. QuillBot AI Humanizer
Best for: people who already pay for QuillBot's paraphraser.
QuillBot's free humanizer handles 100 words per request. Premium, at $8.33 a month on a yearly plan, removes that cap and links the humanizer to QuillBot's AI detector so you can see a "human score". QuillBot doesn't claim the humanizer gets text past detectors.
- Pro: part of a suite with a paraphraser, grammar checker and citation tools.
- Con: 100 words per request is too little for an essay.
- Con: QuillBot uses inputs for training by default; you have to opt out.
5. Netus
Best for: occasional short rewrites from a tool that doesn't train on your text.
Netus calls its humanizer the AI Bypasser. The free plan includes 500 words a month, and paid plans run from $14 to $99 a month. Its privacy policy says it doesn't use your prompts or results to train any AI model, and that text entered in its free tools isn't kept. Text is sent to the outside AI providers it lists to produce results.
- Pro: a clear no-training statement.
- Con: 500 free words a month is one short essay.
6. WriteHuman
Best for: trying several rewrites of one short passage.
WriteHuman's free plan gives three requests a month of up to 250 words each. Paid plans start at $20 a month, or $12 a month billed yearly, and allow up to 3,000 words per request on the top tier. Its pricing page says the enhanced model was "updated for GPTZero and Pangram".
- Pro: several variations per request on paid plans.
- Con: its privacy policy says submitted text and outputs may be used to train its models, with no setting to opt out, and samples are sent to GPTZero for testing.
7. Walter Writes
Best for: high monthly volume across many languages.
Walter Writes offers a 300-word trial, then plans from $8 a month for 30,000 words up to $26 a month for 200,000 words, with a $99 team plan. It supports more than 80 languages. The site describes its output as "detection-proof" and undetectable, without publishing the tests behind that.
- Pro: large word allowances for the price.
- Con: its privacy policy doesn't say what happens to the text you submit.
8. Undetectable AI
Best for: people who want a refund policy tied to detector results.
Undetectable AI has a 250-word trial. Plans start at $9.99 a month for 10,000 words, or $5 a month billed yearly. Every plan lists "Passes AI detectors", and the pricing page promises a refund if output is flagged as not human. The page shows no test data behind the claim.
- Pro: a stated refund policy.
- Con: its privacy policy, dated March 2023, doesn't say what happens to text you submit.
Other humanizers we looked at
- Humbot doesn't publish its free plan's word allowance or its prices on its pricing page. Its paid tiers start at 3,000 basic and 1,000 advanced words a month, and its FAQ calls the output "totally undetectable".
The best AI humanizer for academic writing and research papers
For essays and research papers, what matters most is that the facts survive. Pick a tool that leaves citations, figures and technical terms alone, shows you every change and has a formal style. Our humanizer's Academic style keeps full forms, never touches citations or numbers and lets you lock terms; Grammarly's custom voice is the other strong option if you have a sample of your own academic writing.
Be careful with promises about Turnitin. Turnitin added detection of text from "bypasser" tools on 27 August 2025 and builds it into its AI writing indicator for English submissions. It is licensed only to institutions and retrained over time, so no vendor's claim about it can be checked from outside. Our article on whether AI humanizers work sums up what independent studies found, and course rules decide whether a humanizer is allowed at all.
How we compared
IsThisAiWritten is listed first because it is our own tool and the free, private option with no limits. We ranked the others on how much you can rewrite for free, what happens to your text, and whether what they claim can be checked. On 1 November 2026 we opened each tool's own product, pricing and privacy pages; where a page was unavailable, we used the vendor's own published article. We did not test whether any humanizer gets text past a detector: vendors' own tests disagree with each other, and results change whenever a detector is retrained.
Sources
- Grammarly AI Humanizer, checked November 2026
- Grammarly (Superhuman) privacy policy, checked November 2026
- Clever AI Humanizer, checked November 2026
- QuillBot, Best AI humanizer (17 August 2026), checked November 2026
- QuillBot, How does QuillBot use my data?, checked October 2026
- Netus pricing, checked November 2026
- Netus privacy policy, checked November 2026
- WriteHuman pricing, checked November 2026
- WriteHuman privacy policy, checked November 2026
- Walter Writes, checked November 2026
- Walter Writes privacy policy, checked November 2026
- Undetectable AI pricing, checked November 2026
- Undetectable AI privacy policy, checked November 2026
- Humbot pricing, checked November 2026
- Plagiarism Today, Turnitin launches anti-AI humanizer feature, checked November 2026
- Turnitin Guides: AI writing detection capabilities FAQs, checked November 2026
Questions
What is the best free AI humanizer?
IsThisAiWritten's AI humanizer is free with no sign-up and no word limit, and it runs in your browser, so nothing is uploaded. Among server-based tools, Clever AI Humanizer offers up to 3,000 words per request without an account, and Grammarly's basic humanizer is free too.
Is there an AI humanizer that works for Turnitin?
No tool can honestly promise a Turnitin result. Turnitin has flagged text from bypasser tools since August 2025, it retrains its model, and it is licensed only to institutions, so no outside test is final. If your course allows AI help, use a humanizer to improve how a text reads and disclose AI use the way your rules ask.
Is this AI written? Check it now.
Free, no sign-up, no word limit. The check runs in your browser, so your text never leaves your device.
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