AI humanizer for LinkedIn posts
The three renewal shapes are a daily allowance, no stated cap, and a monthly allowance. A daily allowance covers a posting habit; no stated cap covers it until the vendor changes the page; a monthly allowance of 150 or 300 words covers one post and then stops. Every figure below comes from the vendor's own pricing or product page on the date given.
The table orders eight tools by the shape of their free allowance, daily first, then no stated cap by request size, then monthly by words a month, with the cheapest paid plan beside each for the week the free tier runs out.
How many posts a week does each free tier cover?
A LinkedIn posting habit is three to five posts a week, each from a two-line hook to about 300 words. Call it 200 words a post and 13 posts a month, about 2,600 words. That number is a working estimate, not a measurement, and it is what the free tiers below are set against.
| Free tier (vendor's stated figure) | Words a month it covers | Posts at 200 words | Covers a 3-a-week habit? |
|---|---|---|---|
| StealthWriter, 10 rewrites a day at 1,000 words | Up to 300,000 | Hundreds | Yes |
| Clever AI Humanizer, 3,000 a request, no cap stated | No stated ceiling | No stated ceiling | Yes, until the page changes |
| Surfer, 500 or 1,000 a request, no cap stated | No stated ceiling | No stated ceiling | Yes, until the page changes |
| QuillBot, 125 a request, no use cap stated | No stated ceiling | Each post in two passes | Yes, in pieces |
| Grammarly, 100 AI prompts a month | Not published in words | Up to 100 rewrites, if one prompt is one rewrite | Yes, if a prompt is a post |
| WriteHuman, 3 requests at 250 words | 750 | 3 | No |
| Grubby AI, 300 words | 300 | 1 | No |
| BypassGPT, 150 words at 80 a request | 150 | Less than one | No |
The point of the table is that three of the eight free tiers cover a real posting habit and three cover a single post. For every tool's free detail, including the ones not on this page, see the free humanizer ranking. Longer professional writing has its own pages: emails for the per-request cap argument and marketing copy for voice controls.
What does a rewrite do to a LinkedIn post?
A LinkedIn post is a hook, a claim, a few names and a result. Those are exactly the parts a synonym-swapping rewrite changes without making the text read worse. "We grew the team from 4 to 12 in a year" rewritten to "we grew the team a great deal" has lost the number the post existed to share. A rewrite that touches a colleague's name has changed who gets the credit. No vendor page read for this site states that names, numbers or hashtags are left untouched.
Grammarly's product page describes its tool as scanning for AI-typical patterns such as "an overly formal tone or repetitive phrasing" and then adjusting wording and tone, and states the tool "is not intended to bypass AI detectors" (Grammarly, AI Humanizer, read 9 November 2026). QuillBot's page states a 125-word input limit in free Basic mode and 3 free uses of Advanced (QuillBot, AI Humanizer, read 9 November 2026). StealthWriter's pricing page states 10 humanizations a day at 1,000 words per input on the free tier and 50 a day at 5,000 words on Starter (StealthWriter, pricing, read 9 November 2026).
| What a post rewrite can break | How it shows | How the method on this site counts it |
|---|---|---|
| The number in the result | The post has no result left | Dropped or invented facts named in the review |
| A colleague's or company's name | Credit goes to the wrong person | Errors introduced per 100 words |
| The hook's question | The first line no longer asks anything | Meaning kept, rated 1 to 5 by two editors |
| The register | A plain post comes back sounding like a press release | Readability change reported, not scored |
The published method weights meaning kept at 35 of 100 points and errors introduced at 20, against 30 for detector readings and 15 for limits and access. A detector reading is a statistic about word choice on one day, not a finding about who wrote the text or whether anyone will read it. On LinkedIn the reader scrolling past is the only detector that counts.
StealthWriter states the largest renewing free allowance of the eight tools here, 10 rewrites a day at up to 1,000 words each, read 9 November 2026. An AI humanizer for LinkedIn posts is a free-tier decision, because a post is a few hundred words and most people post several times a week without wanting a plan, so this page orders eight tools by how their free allowance renews and ranks nothing by a score. The overall list is the full humanizer ranking and the other audiences sit in the best-for hub.
Updated
Short answer
StealthWriter states the largest renewing free allowance of the 8 tools on this page, 10 rewrites a day at up to 1,000 words each, read on its pricing page on 9 November 2026, and Clever AI Humanizer the largest single free request, 3,000 words with no sign-up, checked on 8 November 2026. A LinkedIn post is a few hundred words posted several times a week, so the field that decides an AI humanizer for LinkedIn posts is how the free allowance comes back: daily, with no stated cap, or monthly. BypassGPT's 150 free words a month and Grubby AI's 300 cover one post; WriteHuman's three requests cover a quiet week. Tools are ordered by that renewal, and no tool here carries a score.
Which AI humanizer for LinkedIn posts renews its free allowance?
Mode names are the vendor's own and describe a setting, not a measured amount of change. Price is reported, never ranked. Detector readings join this table when the first run under the published method publishes.
| Order | Tool | Best for | Main limitation | Free tier and renewal | Cheapest plan (checked on 8 November 2026 unless dated) | Free per-request cap | Named modes | Review |
|---|---|---|---|---|---|---|---|---|
| 01 |  StealthWriter | A daily posting habit on a tier that resets every day | Free tier runs the Mini model only; paid plans meter rewrites a day, not words | 10 rewrites and 10 AI scans a day, 1,000 words each (read 9 November 2026) | Starter, $20 a month, 50 rewrites a day, 5,000 words per input (read 9 November 2026) | 1,000 words | Models, not modes: Ghost 5.2 Mini free, Pro and Legacy paid | Review of StealthWriter |
| 02 | Clever AI Humanizer | Any post or article, free, no account | No paid tier and no account, so nothing to hold a vendor to | 3,000 words per request, no monthly cap stated, no sign-up | None (free only) | 3,000 words | Normal, Clear & Structured | Review of Clever AI Humanizer |
| 03 |  Surfer AI Humanizer | A long post with no account; vendor states it removes passive voice | No humanizer plan; the cheapest SEO plan listing it is $49 a month | 500 words a request, no account; 1,000 with a free account; no cap stated (read 9 November 2026) | Discovery, $49 a month, humanizer limit not stated (read 9 November 2026) | 500 or 1,000 words | None named | Review of Surfer AI Humanizer |
| 04 | QuillBot AI Humanizer | Short posts, as often as you like | 125 words per input; Advanced mode is 3 uses free | 125 words per input, Basic mode, no use cap stated; 3 Advanced uses | Premium, $8.33 a month billed annually | 125 words | Basic, Advanced | Review of QuillBot AI Humanizer |
| 05 |  Grammarly AI Humanizer | Posts drafted in Grammarly, with preset voices | No word figure published; the free account's 100 AI prompts a month is the renewal | Free tool on the product page; free account adds the Humanizer agent and 100 AI prompts a month (read 9 November 2026) | Pro, $12 shown on the plans card, billing period not stated (read 9 November 2026) | Not stated | Four preset voices plus a custom voice | Review of Grammarly AI Humanizer |
| 06 |  WriteHuman | Three posts a month in Basic quality | 3 requests a month free is a quiet week, not a habit | 3 requests a month, 250 words each | Basic, 80 requests a month, $12 a month billed yearly or $20 monthly | 250 words | Basic, Enhanced quality | Review of WriteHuman AI |
| 07 |  Grubby AI | One or two short posts a month, then a yearly plan | 300 free words a month; the advertised $8.99 rate is a $107.88 yearly charge | 300 words a month (read 9 November 2026) | Essential, 10,000 words a month, 500 words per input, $8.99 a month billed $107.88 yearly or $19.99 monthly (read 9 November 2026) | Not stated on the free tier; 500 on Essential | Simple on Essential; Standard and Enhanced on Pro | Review of Grubby AI |
| 08 |  BypassGPT | Seeing three modes on a three-sentence hook | 80 words per input and 150 words a month free; paid prices did not render | 150 words a month, 80 words per input (read 9 November 2026) | Not shown in the pricing page as served (read 9 November 2026) | 80 words | Fast, Creative, Enhanced | Review of BypassGPT |
Which humanizer should you choose for LinkedIn?
One line per job. Each name links to its full review.
- Choose StealthWriter if you post most days and want a free tier that resets tomorrow.
- Choose Clever AI Humanizer if you want a post or a long article rewritten free with no account.
- Choose Surfer AI Humanizer if your posts run long, you do not want to sign up, and a passive-voice sweep suits your writing.
- Choose QuillBot AI Humanizer if your posts are a hook and a few lines and you already use its grammar tools.
- Choose Grammarly AI Humanizer if you draft in Grammarly and want a preset voice applied.
- Choose WriteHuman if three posts a month is your whole output.
- Choose Grubby AI if you write one short post a month and may later want its yearly plan.
- Choose BypassGPT only to see what three modes do to a hook; nothing longer fits.
How the ranking works
- 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 eight tools on the same fields
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: StealthWriter
StealthWriter and StealthGPT are different products from different companies, read on StealthWriter's pricing page on 9 November 2026.
- Best for
- a daily posting habit on a tier that resets every day.
- Main limitation
- the free tier runs the Ghost 5.2 Mini model only, and paid plans sell rewrites a day you cannot bank.
- Free tier and renewal
- 10 rewrites and 10 AI scans a day, 1,000 words each, read 9 November 2026.
- Cheapest plan
- Starter, $20 a month, 50 rewrites a day, 5,000 words per input, read 9 November 2026.
- Free per-request cap
- 1,000 words.
- Named modes
- models rather than modes; Ghost 5.2 Mini free, Ghost 5.2 Pro and Legacy paid.
Sample 02: Clever AI Humanizer
Clever AI Humanizer publishes one page and no plan, checked on 8 November 2026.
- Best for
- any post or article, free, no account.
- Main limitation
- no paid tier and no account means no vendor commitment.
- Free tier and renewal
- 3,000 words per request, no monthly cap stated, no sign-up.
- Cheapest plan
- none.
- Free per-request cap
- 3,000 words.
- Named modes
- Normal, Clear & Structured.
Sample 03: Surfer AI Humanizer
Surfer's humanizer is a feature of its SEO plans, not a product with its own plan, read 9 November 2026.
- Best for
- a long post with no account; the vendor states it removes passive voice and robotic patterns.
- Main limitation
- raising the limit means a $49-a-month SEO subscription.
- Free tier and renewal
- 500 words a request with no account, 1,000 with a free account; no cap stated, read 9 November 2026.
- Cheapest plan
- Discovery, $49 a month, humanizer limit not stated, read 9 November 2026.
- Free per-request cap
- 500 or 1,000 words.
- Named modes
- none named.
Sample 04: QuillBot AI Humanizer
QuillBot's Premium plan removes the input limit and bundles its paraphraser and grammar checker, checked on 8 November 2026.
- Best for
- short posts, as often as you like.
- Main limitation
- 125 words per input free, and Advanced mode is 3 uses.
- Free tier and renewal
- 125 words per input, Basic mode, no use cap stated; 3 Advanced uses.
- Cheapest plan
- Premium, $8.33 a month billed annually, checked on 8 November 2026.
- Free per-request cap
- 125 words.
- Named modes
- Basic, Advanced.
Sample 05: Grammarly AI Humanizer
Grammarly's plans page counts allowances in AI prompts, 100 a month free and 2,000 a member on Pro, read 9 November 2026.
- Best for
- posts drafted in Grammarly, with preset voices.
- Main limitation
- no word figure published for the humanizer.
- Free tier and renewal
- free tool on the product page; a free account adds the Humanizer agent and 100 AI prompts a month, read 9 November 2026.
- Cheapest plan
- Pro, $12 shown on the plans card, billing period not stated, read 9 November 2026.
- Free per-request cap
- not stated.
- Named modes
- four preset voices plus a custom voice; preset names not stated.
Sample 06: WriteHuman
WriteHuman names two quality settings, Basic and Enhanced, checked on 8 November 2026.
- Best for
- three posts a month in Basic quality.
- Main limitation
- 3 free requests a month, then $12 a month billed yearly for 80.
- Free tier and renewal
- 3 requests a month, 250 words each.
- Cheapest plan
- Basic, 80 requests a month, $12 a month billed yearly or $20 monthly, checked on 8 November 2026.
- Free per-request cap
- 250 words; 600 on Basic.
- Named modes
- Basic, Enhanced quality.
Sample 07: Grubby AI
Grubby AI's Essential plan is $19.99 month to month and $8.99 a month when billed as $107.88 a year, read on its pricing page on 9 November 2026.
- Best for
- one or two short posts a month, then a yearly plan.
- Main limitation
- 300 free words a month, and the advertised monthly rate is a yearly charge.
- Free tier and renewal
- 300 words a month, read 9 November 2026.
- Cheapest plan
- Essential, 10,000 words a month, 500 words per input, $8.99 a month billed $107.88 yearly or $19.99 monthly, read 9 November 2026.
- Free per-request cap
- not stated on the free tier; 500 words on Essential.
- Named modes
- Simple on Essential; Simple, Standard and Enhanced on Pro and above.
Sample 08: BypassGPT
BypassGPT's paid prices render only inside a timed sale banner in the browser, so none appears here until one has been read on a stated date, read 9 November 2026.
- Best for
- seeing what three modes do to a three-sentence hook.
- Main limitation
- 80 words per input and 150 words a month free.
- Free tier and renewal
- 150 words a month, 80 words per input, read 9 November 2026.
- Cheapest plan
- not shown in the pricing page as served on 9 November 2026.
- Free per-request cap
- 80 words.
- Named modes
- Fast, Creative, Enhanced.
Why do lists of LinkedIn humanizers disagree?
Most rank by a detector reading on one day, and readings on 150-word inputs swing more than on long documents, so two lists a week apart disagree. Many also rank by paid monthly pool, which almost no LinkedIn poster needs. This page orders by how the free allowance renews, which changes only when a vendor edits a page, and the corrections log records each change. When the first run publishes, each tool's short-form outputs, their meaning ratings and their readings on five named detectors will be downloadable with the run.
Questions about AI humanizers for linkedin posts
What is the best AI humanizer for LinkedIn posts?
StealthWriter states 10 free rewrites a day at 1,000 words each, Clever AI Humanizer 3,000 words a request free with no stated cap, and QuillBot 125 words a time with no stated use cap, all read in November 2026; which one keeps a post's claim and names intact is what the published method measures, and none has a score yet.
How do I humanize a LinkedIn post for free?
Paste it into a tool whose free tier renews: StealthWriter, Clever AI Humanizer, Surfer and QuillBot all state a free allowance that comes back without a card, read in November 2026, and Clever and Surfer need no account at all.
How many LinkedIn posts a week can a free humanizer handle?
Three 200-word posts a week is about 2,600 words a month, which StealthWriter's daily tier, Clever's uncapped tier and Surfer's uncapped tier cover, and which BypassGPT's 150 words a month, Grubby AI's 300 and WriteHuman's three requests do not, all read in November 2026.
Does a humanizer remove the AI-sounding hooks from a LinkedIn post?
The vendors describe that kind of edit: Grammarly says its tool scans for an overly formal tone and repetitive phrasing and adjusts wording, read 9 November 2026; whether the post still says what you meant is what two editors rate under the method on this site.
Will a humanizer change the names or numbers in my post?
It can: a rewrite that turns "grew the team from 4 to 12" into "grew the team significantly" has removed the result the post was about, and a rewrite that touches a colleague's name or a company name has changed who you are talking about, so read the output against the original before posting.
Which free humanizer takes a long LinkedIn article, not just a post?
Clever AI Humanizer at 3,000 words and StealthWriter at 1,000 words a request free, checked in November 2026; Surfer takes 1,000 with a free account and QuillBot cuts anything over 125 words into pieces.
Is QuillBot's humanizer enough for LinkedIn?
For a short post, yes: QuillBot's free Basic mode takes 125 words per input with no stated use cap, read 9 November 2026, which is a hook and three or four lines; a 300-word post is three passes or Premium at $8.33 a month billed annually.
Do LinkedIn readers run AI detectors on posts?
Almost none do, and detector methods are built on longer documents than a post; the reason to humanize a LinkedIn post is that it reads like every other post, and this site reports dated detector readings only once a run is published.
Sources
- Grammarly, AI Humanizer, read 9 November 2026: Tone and phrasing steps; not intended to bypass detectors; free tool and agent
- QuillBot, AI Humanizer, read 9 November 2026: 125-word free input; Basic and Advanced; 3 Advanced uses
- StealthWriter, pricing, read 9 November 2026: 10 rewrites a day free at 1,000 words; Starter at $20
- Vendor pricing and product pages, checked 8 and 9 November 2026: Free tiers, plans and caps for the other five tools
Revision log
| Page published. |
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