Best free AI humanizer
Only tools with a standing free tier or a no-charge trial appear. Three tools from the main list are left out: StealthGPT charges $1 for three days of access, and HIX Bypass and TwainGPT (now Verva) state no free tier on their pricing pages, all checked on 8 November 2026. Phrasly, whose pricing page sells a $2 trial, states on its humanizer page one free humanization a day of up to 500 words with no sign-up, read 9 November 2026, and is in the table on that basis. Order below is by the free allowance per request, largest first.
Length is the deciding fact. The table below shows how many free requests a 1,500-word essay would need on each tool, using the per-input limits each vendor states.
| Tool | Free words per request | Requests for a 1,500-word essay | Fits inside the free allowance? |
|---|---|---|---|
| Clever AI Humanizer | 3,000 | 1 | Yes |
| Phrasly | 500 | 3 | Yes, over three days, one request a day |
| GPTHuman (trial) | 300 | 5 | No; the trial is 300 words in total |
| Walter Writes AI (trial) | 300 | 5 | No; the trial is 300 words in total |
| Undetectable AI (trial) | 250 | 6 | No; the trial is 250 words in total |
| WriteHuman | 250 | 6 | No; 3 requests a month |
| QuillBot AI Humanizer | 125 | 12 | Yes, in 12 pieces |
| BypassGPT | 80 | 19 | No; 150 words a month |
Figures from each vendor's pricing or product page, checked on 8 November 2026, or read on 9 November 2026 for Phrasly. Grammarly is left off because its allowance is counted in AI prompts, not words.
The published method runs every tool on the same 24 AI-written inputs and 6 human-written controls, checks every output on GPTZero, Originality.ai, Copyleaks, Pangram and ZeroGPT, and scores with fixed weights: meaning kept 35, errors introduced 20, detector pass rate 30, limits and access 15. Free tiers are run separately whenever the free limit accepts the input, so a free-tier row and a paid-plan row can both exist for the same tool. The input genres and the rater rubric are on the method page.
The limits and access dimension is where free tiers differ most. It scores words per request, words per month on the tested plan, the free allowance and whether sign-up is required, all from the vendor's own pages on the run date. Price is reported, never scored.
Peer-reviewed work explains why meaning kept outweighs detector readings on this site. Krishna and colleagues showed that a paraphraser dropped one detector's detection rate from 70.3 percent to 4.6 percent at a 1 percent false positive rate (Krishna et al. 2023, arXiv 2303.13408). Weber-Wulff and colleagues tested 14 detectors and found all of them below 80 percent accuracy, with accuracy falling further on paraphrased text (Weber-Wulff et al. 2023, International Journal for Educational Integrity). Paraphrasing moves detector scores; neither paper measured whether the paraphrased text still said the same thing, and that is the gap this site's rubric fills.
Clever AI Humanizer offers the largest free allowance of the nine free AI humanizers on this page, 3,000 words per request with no sign-up, checked on 8 November 2026. The best free AI humanizer for a given text is the one whose free limit accepts it whole, so the limits come first here and the fields match the main ranking: verdict, best for, main limitation, free tier, cheapest plan and per-request limit, plus two fields that matter only on this page, the free limit and whether you must sign up.
Updated
Short answer
Clever AI Humanizer has the largest free allowance of any AI humanizer listed here, 3,000 words per request with no monthly cap and no sign-up, checked on 8 November 2026. Eight other tools offer something free: Phrasly (one humanization a day, up to 500 words, no sign-up, read 9 November 2026), QuillBot (125 words per input), BypassGPT (150 words a month, 80 per input), WriteHuman (3 requests a month at 250 words) and Grammarly (a free plan counted in AI prompts) have standing free tiers, while Undetectable AI (250 words in total), GPTHuman (300 words) and Walter Writes AI (300 words, no card) offer one-off trials. StealthGPT, HIX Bypass and Verva are not on this page: StealthGPT charges $1 for a trial and the other two state no free tier. Every limit below carries the date it was checked.
Which is the best free AI humanizer by free limit?
Every figure comes from the vendor's own pricing or product page, checked on 8 November 2026 or read again on 9 November 2026 where a date says so. A standing free tier (Clever, Phrasly, WriteHuman, QuillBot, BypassGPT, Grammarly) renews; a trial (GPTHuman, Walter Writes AI, Undetectable AI) is a fixed number of words, once.
| Sample | Tool | Free limit | Sign-up required | Best for | Main limitation | Cheapest paid plan (checked on 8 November 2026) | Per-request limit | Review |
|---|---|---|---|---|---|---|---|---|
| 01 | Clever AI Humanizer | 3,000 words per request, no monthly cap stated | No | Full essays and articles, free, today | No paid tier to move to if the free service changes | None (free only) | 3,000 words | Review of Clever AI Humanizer |
| 02 |  Phrasly | One humanization a day, up to 500 words (read 9 November 2026) | No | One mid-length passage a day with no account | One rewrite a day, 15 to 500 words, shared across the vendor's guest pages and limited per device and network | Unlimited, $10.99 a month billed annually, read 9 November 2026 | 500 words free, 800 on the $2 trial, 5,000 on Unlimited | Review of Phrasly |
| 03 |  GPTHuman | 300 words of output in total (trial) | Yes, registration page | A one-off test before buying Starter | Trial ends at 300 words | Starter, 25,000 words a month, $15 monthly or $8.25 a month billed $99 yearly | 300 words free, 1,000 on Starter | Review of GPTHuman |
| 04 |  Walter Writes AI | 300-word trial | No card; sign-up not stated on the pricing block | Testing three modes on a short sample | Trial ends at 300 words; Starter caps a request at 750 | Starter, 30,000 words a month, $8 a month billed $96 yearly | 750 words on Starter | Review of Walter Writes AI |
| 05 |  Undetectable AI | 250 words in total (trial) | Not stated on the pricing page | A single short paragraph to see the output style | Trial is 250 words in total, then $60.00 a year up front for the $5.00 rate | 10,000 words a month, $5.00 a month billed $60.00 yearly | Not stated | Review of Undetectable AI |
| 06 |  WriteHuman | 3 requests a month, 250 words each, Basic quality | Not stated on the pricing page | A few short pieces a month, every month | Three requests a month at Basic quality; Enhanced needs a paid plan | Basic, 80 requests a month, $12 a month billed yearly or $20 monthly | 250 words free, 600 on Basic | Review of WriteHuman AI |
| 07 | QuillBot AI Humanizer | 125 words per input, Basic mode | Not stated on the humanizer page | Short passages, unlimited times | 125 words per input in Basic mode only | Premium, $8.33 a month billed annually | 125 words free, no limit stated paid | Review of QuillBot AI Humanizer |
| 08 |  BypassGPT | 150 words a month, 80 words per input | Not stated on the pricing page | Comparing three modes on a sentence or two | 80 words per input, 150 a month | Paid tiers did not render on the pricing page | 80 words free | Review of BypassGPT |
| 09 |  Grammarly AI Humanizer | Free plan with basic humanization; allowance counted in AI prompts | Yes, free Grammarly account | Grammarly users humanizing inside the editor | No word figure published for the free plan | Pro, $12 shown on the plans card | Not stated | Review of Grammarly AI Humanizer |
Which free humanizer should you choose?
One line per job. Each name links to its full review.
- Choose Clever AI Humanizer if you have a full-length text and no budget: 3,000 words per request, no account, no monthly cap stated.
- Choose Phrasly if you have one passage under 500 words a day and want no account: one free humanization every 24 hours, read 9 November 2026.
- Choose QuillBot AI Humanizer if your passages are under 125 words and you want to run them as often as you like.
- Choose WriteHuman if you need two or three 250-word pieces humanized each month and nothing more.
- Choose Grammarly AI Humanizer if you already draft in Grammarly and a free account is no obstacle.
- Choose BypassGPT if you want to compare Fast, Creative and Enhanced modes on a single paragraph under 80 words.
- Choose Undetectable AI, GPTHuman or Walter Writes AI only to test the output style before deciding on a paid plan; each trial is 250 to 300 words and does not renew.
How are free tiers tested on this site?
- Inputs
- 24 texts24 AI-written inputs across six genres plus 6 human-written controls, the same set for every tool.
- Detectors
- 5 namedGPTZero, Originality.ai, Copyleaks, Pangram and ZeroGPT.
- Weights
- Meaning kept35
- Errors introduced20
- Detector pass rate30
- Limits and access15
- Run date
The nine free tools, same fields for each
Every free tier gets the same fields, in rank order. The disc is the sample number it was poured under in the full run.
Sample 01: Clever AI Humanizer
Clever AI Humanizer is free with no stated monthly cap, accepts 3,000 words per request and asks for no sign-up, checked on 8 November 2026 on the vendor's homepage. It names two modes, Normal and Clear & Structured, and offers an API.
Review: Clever AI Humanizer review.
- Free limit
- 3,000 words per request, no monthly cap stated.
- Sign-up required
- no.
- Best for
- full essays and articles with no account and no cost.
- Main limitation
- nothing beyond the free tier, so there is no plan to move to if the free service changes.
- Cheapest paid plan
- none.
- Per-request limit
- 3,000 words.
Sample 02: Phrasly
Phrasly's humanizer page states "one free humanization a day of up to 500 words, with no signup required", with a 15-word minimum, shared across the vendor's guest humanizer pages, limited per device and network, and returning 24 hours after use, read on the Phrasly AI humanizer page on 9 November 2026. The pricing page sells a $2 three-day trial with 1,000 humanization words at 800 per process and an Unlimited plan at $10.99 a month billed annually with 5,000 words per process, read the same day.
Review: Phrasly review.
- Free limit
- one humanization a day, 15 to 500 words.
- Sign-up required
- no, stated on the humanizer page.
- Best for
- one mid-length passage a day with no account.
- Main limitation
- a single rewrite a day, and the paid plan is billed for a year at once.
- Cheapest paid plan
- Unlimited, $10.99 a month billed annually, read 9 November 2026.
- Per-request limit
- 500 words free, 800 on the $2 trial, 5,000 on Unlimited.
Sample 03: GPTHuman
GPTHuman's Free plan is a trial of 300 words of humanizer output at 300 words per output, started from a registration page, read on the GPTHuman pricing page on 9 November 2026.
- Free limit
- 300 words in total.
- Sign-up required
- yes.
- Best for
- one test of the output before buying Starter.
- Main limitation
- the trial ends at 300 words, and the pricing page shows a dollar sign without naming the currency.
- Cheapest paid plan
- Starter, 25,000 words a month, $15 monthly or $8.25 a month billed $99 yearly, read 9 November 2026.
- Per-request limit
- 300 words on the trial, 1,000 on Starter.
Sample 04: Walter Writes AI
Walter Writes AI's trial is 300 words with no card, and the Starter plan that follows gives 30,000 words a month for $8 a month billed $96 yearly with a 750-word request cap, checked on 8 November 2026 on the vendor's homepage pricing block.
Vendor site: Walter Writes AI.
- Free limit
- 300-word trial.
- Sign-up required
- no card; the pricing block does not state whether an account is needed.
- Best for
- testing the Simple, Standard and Enhanced modes on a short sample.
- Main limitation
- the trial ends at 300 words, and Starter caps each request at 750 words.
- Cheapest paid plan
- Starter, 30,000 words a month, $8 a month billed $96 yearly, checked on 8 November 2026.
- Per-request limit
- 750 words on Starter.
Sample 05: Undetectable AI
Undetectable AI's free trial is limited to 250 words in total, after which the entry plan is 10,000 words a month at $5.00 a month charged $60.00 annually, or $9.99 monthly, read on the Undetectable AI pricing page on 9 November 2026.
- Free limit
- 250 words in total.
- Sign-up required
- not stated on the pricing page.
- Best for
- one short paragraph to see the output style.
- Main limitation
- 250 words is the whole trial, and the $5.00 rate needs a year paid up front.
- Cheapest paid plan
- 10,000 words a month, $5.00 a month billed $60.00 yearly, read 9 November 2026.
- Per-request limit
- not stated.
Sample 06: WriteHuman
WriteHuman's Free plan allows 3 humanizer requests a month at up to 250 words each in Basic quality, read on the WriteHuman pricing page on 9 November 2026. Basic, the first paid plan, allows 80 requests a month at 600 words each in Enhanced quality.
- Free limit
- 3 requests a month, 250 words each.
- Sign-up required
- not stated on the pricing page.
- Best for
- a few short pieces every month.
- Main limitation
- three requests a month at Basic quality; the Enhanced model is paid only.
- Cheapest paid plan
- Basic, 80 requests a month, $12 a month billed $144 yearly or $20 monthly, read 9 November 2026.
- Per-request limit
- 250 words free, 600 words on Basic.
Sample 07: QuillBot AI Humanizer
QuillBot's AI Humanizer is free in Basic mode with a 125-word limit per input, and Premium removes the limit and adds Advanced mode, read on the QuillBot AI Humanizer page on 9 November 2026. Premium was $8.33 a month billed annually on 8 November 2026.
- Free limit
- 125 words per input, Basic mode, with three uses of Advanced mode stated on 8 November 2026.
- Sign-up required
- not stated on the humanizer page.
- Best for
- short passages run as many times as needed.
- Main limitation
- 125 words per input and Basic mode only.
- Cheapest paid plan
- Premium, $8.33 a month billed annually, checked on 8 November 2026.
- Per-request limit
- 125 words free; no limit stated on Premium.
Sample 08: BypassGPT
BypassGPT's free tier is 150 words a month at 80 words per input with Fast, Creative and Enhanced modes, read on the BypassGPT pricing page on 9 November 2026. Paid tiers on the page load through a client-side sale banner and did not render on either check.
- Free limit
- 150 words a month, 80 words per input.
- Sign-up required
- not stated on the pricing page.
- Best for
- comparing three modes on a paragraph under 80 words.
- Main limitation
- 80 words per input and 150 words a month.
- Cheapest paid plan
- not shown as rendered on 8 and 9 November 2026.
- Per-request limit
- 80 words.
Sample 09: Grammarly AI Humanizer
Grammarly's AI Humanizer comes with a free Grammarly account, and the plans page prices Pro at $12 with allowances counted in AI prompts per month, not humanizer words, read on the Grammarly AI Humanizer page and Grammarly plans page on 8 and 9 November 2026.
- Free limit
- free plan with basic humanization; the allowance is counted in AI prompts, with no word figure published.
- Sign-up required
- yes, a free Grammarly account.
- Best for
- Grammarly users who want humanizing inside the editor.
- Main limitation
- no published word figure for the free plan.
- Cheapest paid plan
- Pro, $12 shown on the plans card, billing period not stated on the card, checked on 8 November 2026.
- Per-request limit
- not stated.
Why is "free" not the same for every tool?
Three different things get called free on these pages. A standing free tier renews: WriteHuman's 3 requests a month, BypassGPT's 150 words a month, QuillBot's 125-word Basic mode, Phrasly's one humanization a day and Clever AI Humanizer's uncapped service. A trial is a fixed pool of words that runs out once: Undetectable AI's 250, GPTHuman's 300, Walter Writes AI's 300. A free plan with a different unit, Grammarly's AI prompts, cannot be compared in words at all.
| Kind of free | Tools | What renews |
|---|---|---|
| Standing free tier, word-based | Clever AI Humanizer, QuillBot, BypassGPT, WriteHuman | Monthly (Clever states no cap) |
| Standing free tier, daily | Phrasly (one humanization a day, up to 500 words, no sign-up, read 9 November 2026) | Every 24 hours |
| One-off trial | Undetectable AI, GPTHuman, Walter Writes AI | Nothing; 250 to 300 words once |
| Free plan, prompt-based | Grammarly AI Humanizer | Monthly, in AI prompts |
| Paid trial (not on this page) | StealthGPT ($1) | Three days of access |
All classifications from the vendors' pricing or product pages, checked on 8 November 2026. If a vendor changes a limit, the row changes and the date with it; the corrections log records the change.
No detector score should be the only evidence in a misconduct case. If you are a student, check your institution's AI policy before using any writing tool, free or paid: a humanizer does not make undisclosed AI use acceptable.
Questions about free AI humanizers
What is the best free AI humanizer?
Clever AI Humanizer offers the most free text of the tools listed here, 3,000 words per request with no sign-up and no stated monthly cap, checked on 8 November 2026; whether its output keeps your meaning is what the published method on this site measures.
Is there a free AI humanizer with no word limit?
Clever AI Humanizer states no monthly cap but does cap each request at 3,000 words, checked on 8 November 2026; every other free tier here has a per-input or per-month limit.
Which free AI humanizer needs no sign-up?
Clever AI Humanizer states that no sign-up is needed, checked on 8 November 2026; Grammarly's humanizer runs inside a free Grammarly account, and GPTHuman's 300-word trial starts from a registration page, both read on 9 November 2026.
Is Undetectable AI free?
Undetectable AI offers a free trial limited to 250 words in total, and further use needs a paid plan starting at $5.00 a month billed $60.00 yearly, read on its pricing page on 9 November 2026.
Is QuillBot's AI Humanizer free?
Yes, in Basic mode with a 125-word limit per input; Advanced mode and unlimited length need Premium, read on QuillBot's humanizer page on 9 November 2026.
Does Walter Writes AI have a free version?
Walter Writes AI offers a 300-word trial with no card, after which the Starter plan costs $8 a month billed yearly for 30,000 words with a 750-word request cap, checked on 8 November 2026.
Can a free humanizer handle a whole essay?
Only Clever AI Humanizer takes a full essay in one request on its free tier (3,000 words); the other free tiers here accept 80 to 300 words at a time, so a 1,500-word essay would need 5 to 19 requests.
Do free AI humanizers work as well as paid ones?
The same published method applies to free tiers and paid plans alike, with free tiers run separately whenever the free limit accepts the input; peer-reviewed work shows paraphrasing lowers detector accuracy, but it says nothing about which tier keeps meaning better, which is why the site measures it.
Sources
- GPTHuman pricing, read 9 November 2026: 300-word trial, Starter plan, 1,000 words per output
- Undetectable AI pricing, read 9 November 2026: 250-word trial, 10,000-word plan at $5.00 a month billed $60.00 yearly
- WriteHuman pricing, read 9 November 2026: 3 free requests at 250 words; Basic plan limits and price
- QuillBot AI Humanizer, read 9 November 2026: 125-word free limit, Basic and Advanced modes
- BypassGPT pricing, read 9 November 2026: 150 free words a month, 80 per input
- Phrasly AI humanizer page and Phrasly pricing, read 9 November 2026: One free humanization a day up to 500 words with no sign-up; $2 trial; Unlimited at $10.99 a month billed annually
- Grammarly AI Humanizer and Grammarly plans, read 8 and 9 November 2026: Free account, Pro at $12, AI prompt allowances
- Clever AI Humanizer homepage and Walter Writes AI homepage pricing block, checked 8 November 2026: Free 3,000-word requests with no sign-up; 300-word trial and Starter plan
- Krishna et al. 2023: Paraphrasing dropped detection from 70.3 to 4.6 percent at 1 percent false positive
- Weber-Wulff et al. 2023: 14 detectors, all below 80 percent accuracy
Revision log
| Page published. |
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