Paste your draft
Drop in up to 2,500 English words: an essay, a report, an article or an email.
FREE AI HUMANIZER
Humanize AI text.
Keep your meaning.
Free AI humanizer that rewrites only the sentences that read as AI-generated, checks that names, numbers and citations survive, and shows every change.
Meaning checkedEvery change shown12 detector estimates
YOUR NEXT DRAFTStart free
0 words
500 free rewrite words a day · Unlimited AI risk checks · No card required
HOW IT WORKS
Three steps. One place.
Choose your focus
Keep Smart coverage to touch only high-risk sentences, or run a full-draft pass. Pick up to three detectors to focus on.
Review every change
Rewritten sentences are highlighted. Compare before and after, then copy or download the version you want.
WHY PASSLAB
A humanizer that leaves your argument alone.
Rewrites only what needs it
Low-risk sentences stay word for word. The rewrite goes where the AI risk is, not across the whole draft.
Meaning checked as it goes
Names, numbers, quotes and citations are checked during the rewrite, so the facts your argument rests on stay put.
Every change shown
Open Changes to see each rewritten sentence highlighted. No guessing what moved.
Estimates for 12 detectors
See an AI risk estimate for Turnitin, GPTZero (beta), Originality.ai and nine more, before and after the rewrite.
Keeps your original when it is safer
If a rewrite would make the draft worse, PassLab keeps your original and tells you why.
Every draft saved
Results and their originals are saved to My drafts, so you can return, compare or continue later.
EVERY CHANGE SHOWN
See exactly what changed.
Switch to Changes and every rewritten sentence is highlighted. Untouched sentences stay word for word, so checking the edits takes minutes, not a full reread.
SCORES YOU CAN ACT ON
Watch the risk move, sentence by sentence.
Before and after estimates for the whole draft, plus a sentence map that shows which passages still read as AI-written. Pick one and run another pass on just that part.
YOU STAY IN CONTROL
You decide what the rewrite focuses on.
Choose Smart coverage or a full-draft pass, and pick up to three detectors to prioritise. PassLab still estimates AI risk across the rest.
ONE DRAFT. TWELVE ESTIMATES.
See how your draft reads to each detector.
- Turnitin
- GPTZero (beta)
- Originality.ai
- Copyleaks
- Pangram
- Winston AI
- ZeroGPT
- Sapling
- QuillBot
- Grammarly
- StealthWriter V1
- StealthWriter V2
Estimates come from PassLab's own models, not from the detectors themselves, and official results can differ. PassLab is not affiliated with any detector listed.
WHO IT IS FOR
Built for real writing.
Students
Smooth out stiff, formulaic passages in essays and reports while your sources and figures stay exactly as you wrote them.
- Citations and quotes left intact
- Changes you can check line by line
- Follow your course's rules on AI assistance
Writers and professionals
Make AI-assisted drafts read like a person wrote them, without losing product names, numbers or the point you were making.
- Articles, reports, emails and briefs
- Up to 2,500 words per rewrite
- Copy or download the version you choose
What is an AI humanizer?
An AI humanizer rewrites text so it reads less like the output of a language model. AI-generated drafts tend to share habits: even sentence lengths, predictable transitions, stock phrases and an over-tidy structure. Detectors look for those patterns, and readers notice them too.
Many humanizers deal with this by paraphrasing everything. That can lower an AI score, but it often breaks the draft: names change, numbers drift, citations disappear and the argument goes soft. You then spend longer fixing the rewrite than you saved.
How PassLab does it differently
PassLab works sentence by sentence. It estimates which sentences carry the most AI risk, rewrites those, and leaves the rest alone. During the rewrite it checks the details your argument depends on, and every change is highlighted so you can review it.
The AI risk scores you see are PassLab's own estimates for each detector. They are useful for deciding what to revise, but they are not the detectors' official results, and they describe writing patterns rather than proving who wrote a text.
GOOD QUESTIONS
Frequently asked questions.
Is the AI humanizer free?
Yes. A free account includes 500 rewrite words a day and unlimited AI risk checks, with no card required. Paid word packs and a monthly plan are available if you need more.
Will PassLab change my meaning?
PassLab is built to avoid that. It rewrites only the sentences that need it, checks names, numbers, quotes and citations as it goes, and keeps your original if a rewrite would make the draft worse.
Which AI detectors does PassLab estimate?
Twelve, including Turnitin, GPTZero (beta), Originality.ai, Copyleaks, Pangram and Winston AI. The scores are PassLab's own estimates; official results can differ, and PassLab is not affiliated with any of these detectors.
How long can my draft be?
Up to 2,500 English words per rewrite. Longer documents can be split into sections.
Can I see what was changed?
Yes. The Changes view highlights every rewritten sentence, and the Before view shows your original text.
Can I use PassLab for school work?
PassLab is a revision tool for writing you are responsible for. Follow your institution's rules on AI assistance and keep the final say on every change. See our Acceptable Use policy.
Humanize your next draft.
Start with 500 free rewrite words a day. No card required.