Free tool, no sign-up
Humanize AI text
Paste a draft. Every paragraph is rewritten separately, and you see exactly which words changed against the original before you use any of it.
Uniform sentence lengths are the clearest machine tell.
Stops every point being built to the same template.
"It is worth noting", "delve", "leverage", restating closers.
Replaces them with a colon, comma or new sentence.
How it works
Three steps, and you check the result
Paste your draft
One blank line between paragraphs. Each one is handled separately, which is why the progress bar counts real work instead of animating.
Pick how hard to rewrite
Light is a proofread. Thorough rebuilds every sentence from scratch, keeping only the facts. Four extra switches handle rhythm, structure, filler and em-dashes.
Read the diff before you use it
Added words highlighted, removed words struck through, and the share of your original wording that survived. Nothing is hidden behind "trust us".
What makes it different
Built so you can check it
You see every word that changed
Original and rewrite side by side, word-level. Most humanizers hand back a block of text and ask you to take it on faith. You should not have to, least of all with something you are about to publish under your own name.
Controls, not one magic button
Uniform sentence length and a template repeated under every point are what make a draft read as machine-assembled. Those are the switches, because those are the actual tells.
Paragraph by paragraph
A model holds its voice over a paragraph far better than over a whole essay, and one failed paragraph keeps its original text rather than costing you the document.
Questions
Straight answers
Will this remove a watermark or SynthID from my text?
In practice, yes, and it is worth understanding why rather than taking it on faith. Text watermarking such as Google DeepMind's SynthID-Text or Anthropic's does not attach anything to your document. It nudges which words the model picks as it writes, leaving a statistical pattern across those choices. Rewriting the passage produces a new set of word choices, made by a different model that does not apply that scheme, so the original pattern does not carry over. Two honest caveats: this is a side effect of rewriting, not a guarantee, and lightly edited text keeps more of the original pattern than heavily rewritten text. Separately, AI detectors are not watermark readers. They guess from style, they are unreliable in both directions, and nothing here promises anything about them.
What is the difference between Light, Balanced and Thorough?
How much of your original wording survives. Light is a proofread: it fixes what reads as machine-written and leaves the rest alone, typically keeping 80 percent or more of your words. Balanced rewords where it helps. Thorough rebuilds every sentence from scratch, keeping only the facts, and usually keeps under 40 percent. Measured on the same paragraph: 79 percent, 71 percent, and 29 percent.
Does it change what my text says?
It is instructed not to: no new facts, names, numbers or claims, and none removed. It is a line edit, not a rewrite of your argument. That said, these are language models, and the whole reason the diff is on the page is so you can check rather than assume. Read it before you publish.
What does the similarity number mean?
The share of your original words that survived. A light edit lands around 80 to 90 percent. Turning on every option typically lands in the 30s, because cutting filler and restructuring sentences genuinely replaces most of the wording.
Is it free, and is there a limit?
Free, no sign-up. It runs on free-tier models, so expect a few seconds per paragraph, and occasionally a paragraph comes back unchanged because every free model was rate limited at that moment. The page tells you when that happens instead of passing your input off as a rewrite.
Can I use it from my own code?
Yes. POST to /api/v1/rewrite with an API key and it returns the rewritten text plus the same per-paragraph diff statistics the page shows, so it drops into an Apify actor or a Fly worker without scraping this page.
Free tool
Every word that changed, in front of you.
No sign-up. If you want it in a pipeline instead, the same rewrite runs at /api/v1/rewrite.