humanizer

sponsored by cfo.ai

Humanizer makes AI-written text sound like a person wrote it, without changing what it says. It is built on Wikipedia's Signs of AI writing, the guide Wikipedia editors use to catch AI-generated text, and it works in Claude Code, Codex, and any other agent that supports skills.

Before:

I'm thrilled to announce that shared drafts are finally here! 🚀 For months, our own team was drowning in files named final_v7.docx — and we knew there had to be a better way. Now two people can edit the same doc at once, with every change appearing live for both of them. It's not just a feature; it's a whole new way to collaborate. Comments stay anchored to the exact sentence they reference, even as the text around them evolves. And the best part? It's available today on every plan, completely free. Let that sink in.

After:

Shared drafts are out today. For months our own team passed around files named final_v7.docx, so we built a way for two people to edit the same doc at once, with each person's changes showing up live for the other. Comments stay pinned to the sentence they're about, even when the text around them changes. It's free on every plan.

In a blind test, judges preferred Humanizer's rewrite over the original AI text 16 times out of 16 (#229).

Humanizer edits for human readers. Getting past AI detectors is not a goal, and detectors still flag most of its output.

These are the most common signs of AI writing, and Humanizer rewrites any of them on sight:

1. Not X but Y: "It's not just a feature, it's a shift."
2. One-line closers: "Let that sink in."
3. Sayings that sound deep: "At its core, what really matters is..."
4. A staged run-up: "Here's the thing." "Honestly?"
5. Arguing with no one: "I'm not saying X, but..."

Humanizer checks for 26 patterns in all.

Once installed, the skill answers to /humanizer.

/plugin marketplace add blader/humanizer
/plugin install humanizer@humanizer

The plugin answers to /humanizer:humanizer. It needs Claude Code 2.1.142 or newer; on older versions, use npx skills add blader/humanizer --global --agent claude-code.

npx skills add blader/humanizer --global --agent codex

Download this repository as a ZIP (Code → Download ZIP) and upload it as a skill in Settings.

npx skills add blader/humanizer --global --agent '*'

This installs Humanizer for every agent the Skills CLI supports, including Gemini CLI, GitHub Copilot, and Windsurf. Leave off --global in any command above to install it only in the current project. For an agent the Skills CLI does not know, copy SKILL.md into its skill folder.

Call the skill directly:

/humanizer

[paste your text here]

Or ask in plain language:

Please humanize this text: [your text]

To rewrite a file, give Humanizer its path:

Humanize the prose in docs/launch-post.md

If you want the rewrite to sound more like you, include a sample:

/humanizer

Here's a sample of my writing for voice matching:
[paste 2-3 paragraphs of your own writing]

Now humanize this text:
[paste AI text to humanize]

Humanizer follows the sample's rhythm, word choice, punctuation, and deliberate quirks, including dashes if you use them.

A language model writes whatever is most likely to come next, so by default it makes the choice that fits the widest range of readers and subjects. A person chooses for one reader and one subject. Every tell Humanizer looks for is a form of that default choice: a sentence that signals importance instead of adding a fact, rhythm or formatting applied by rule, an ordinary fact dressed as a pivotal one, text left over from the chat, or a reply that re-explains what the reader already knows.

"LLMs use statistical algorithms to guess what should come next. The result tends toward the most statistically likely result that applies to the widest variety of cases." Wikipedia, "Signs of AI writing"

Humanizer marks every tell it finds, strongest first. It drafts a rewrite without treating the original structure as fixed, checks the draft against the patterns and the original claims, and then writes the final version. It does not make things up. A name, number, date, quote, citation, or other factual detail must come from the source or the writer, and if a sentence needs a detail that is missing, Humanizer asks instead of inventing one.

When you paste text, Humanizer shows its work: the first rewrite, a short critique of anything that still sounds artificial, and the final version. Point it at a file and it changes only the prose, leaving code, data, frontmatter, and link targets alone. Personal writing keeps the writer's opinions and quirks. Technical and reference prose stays neutral and plain.

The patterns are numbered by strength and frequency. The first five justify an edit on a single sighting. Patterns marked weak alone count only when several tells share a passage, because a careful writer may use any one of them on purpose.

Before (AI-sounding):

I recently spent five unforgettable days in Lisbon last October, and let me tell you — this city completely stole my heart. From the moment I checked into my charming hotel perched high in the historic Alfama district, I knew I was somewhere truly special.

Yes, the famous hills are challenging — with countless stairs between my hotel and everything else, my legs certainly felt it! — but every climb rewards you with breathtaking, panoramic views that make it all worthwhile.

No trip would be complete without riding the iconic Tram 28, a roughly forty-minute journey shared with plenty of fellow travelers eager to capture the magic. And the food? Simply divine. While the pastéis de nata at Pastéis de Belém are a beloved national treasure, my absolute favorite came from a hidden gem in Graça, still warm from the oven.

But what truly makes Lisbon special isn't just the sights — it's the feeling. Wander just a block or two above the main squares and you'll discover a quieter, more authentic side of the city, inviting you to slow down and savor every moment.

Of course, the must-see São Jorge Castle offers stunning views over the rooftops below. The queues can be long, but the experience is absolutely worth it for any history buff or curious traveler.

Would I go back? Absolutely — next time in spring, and with better shoes! Lisbon isn't just a place to visit; it's a place to fall in love with, again and again. ✨

After:

I spent five days in Lisbon last October. My hotel was up in Alfama, with a lot of stairs between it and everything else, and my legs felt every one of them. The views from the top were worth the climb.

Everyone tells you to ride Tram 28, so I did. The trip took about forty minutes, and most of the car was other tourists taking pictures out the windows. The custard tarts at Pastéis de Belém are the famous ones, but my favorite came from a place in Graça, still warm from the oven.

The part of Lisbon I liked best starts a block or two above the main squares, where the streets go quiet and nobody is in a hurry. São Jorge Castle has good views over the rooftops and a long queue to get them.

I'd go back, in spring next time, and with better shoes.

• Wikipedia: Signs of AI writing is the source for the pattern list.
• WikiProject AI Cleanup maintains the page.

See CHANGELOG.md.

MIT

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