Last updated: October 2026. Prices are in USD unless marked CAD. Canadian cards are usually charged in USD and converted by your bank, plus GST/HST.
An AI humanizer rewrites AI-generated text so it reads more naturally: varied sentences, fewer clichés, a more personal tone. Our top picks: QuillBot for the best value, Grammarly Humanizer as the best free option, and Undetectable.ai for the most control.
QuillBot
Paraphraser plus humanizer, detector, summariser and grammar checker in one plan. Premium from $8.33/month billed yearly.
Best AI humanizers compared
| Tool | Free plan | Paid from | Best for |
|---|---|---|---|
| QuillBot | Humanizer 125 words per use | $8.33/month (annual) | Best value all-in-one writing tool |
| Grammarly Humanizer | Yes, no account needed | Grammarly Pro (~$12/month) | Natural tone in your own voice |
| Undetectable.ai | 250-word trial | $5/month (annual) | Most rewrite modes and languages |
| WriteHuman | 3 requests/month | $12/month | Several output variations |
| Walter Writes | 300 words | ~$8/month (annual) | Academic-style writing |
| StealthGPT | Limited | ~$30/month | Long documents |
| Humbot | A few hundred words | ~$8/month (annual) | Cheap high-volume rewriting |
1. QuillBot — best value
QuillBot started as a paraphraser and now includes a humanizer, AI detector, summariser and grammar checker. The free humanizer handles 125 words at a time; Premium unlocks more modes and longer inputs. Best for students and writers who want one affordable writing toolkit.
2. Grammarly Humanizer — best free option
Grammarly’s humanizer is free and works without an account. A free account adds voice profiles so rewrites sound like you, in six languages. Grammarly states clearly that it is not meant to bypass AI detectors, which makes it the safest choice for professional writing.
3. Undetectable.ai — most control
Undetectable.ai combines a humanizer with a multi-detector checker, offers several writing modes and supports 50+ languages. Plans are priced by word volume, from about $5/month on annual billing.
4. WriteHuman
Generates up to five variations of each rewrite so you can pick the most natural. Plans from $12/month.
5. Walter Writes
Aimed at essays and academic writing, with a built-in detector. Annual plans from about $8/month.
6. StealthGPT and 7. Humbot
StealthGPT targets long documents but is pricier; Humbot is a budget option for high volumes. Check current word limits before paying.
Pros
- Make stiff AI drafts read naturally
- Cheap or free options available
- Useful for non-native English writers
- Most include a detector to check results
Cons
- No tool reliably “beats” every detector
- Can change meaning, always reread
- Many vendors use aggressive marketing claims
- Prohibited uses still break school or work rules
Are AI detectors even reliable?
Not very. OpenAI shut down its own AI text classifier in 2023 because of low accuracy, and a Stanford study found popular detectors flagged essays by non-native English writers as AI more than 60% of the time. In Canada, the University of Waterloo turned off Turnitin’s AI detection in 2025 and UBC never enabled it, citing reliability and bias. Other schools, such as the University of Toronto, treat unauthorised AI use as an academic offence regardless of detection.
How to humanize AI text yourself
- Add your own examples, opinions and experiences.
- Vary sentence length; cut filler phrases like “in today’s fast-paced world”.
- Replace generic claims with specific facts and numbers.
- Read it aloud and rewrite anything you would not say.
FAQ
What is the best free AI humanizer?
Grammarly’s Humanizer is free with no account needed. QuillBot’s free humanizer is a good alternative for short passages.
Do AI humanizers work against Turnitin?
Results are inconsistent: the same text can pass one detector and fail another. No humanizer can guarantee a result.
Is using an AI humanizer cheating?
The tool itself is legal. Whether it is allowed depends on your school or employer’s rules on AI use. When in doubt, ask.