humanizer

blader/humanizer is an open-source project by blader: Agent skill that removes signs of AI-generated writing from text. Indexed here so it can be found — not resold.

It is free. Get it from the upstream repository: https://github.com/blader/humanizer

From the project's own README (excerpt, reproduced for discovery under its MIT license):

Humanizer

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 finalv7.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 finalv7.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.

The five strongest tells

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…