Humanizer: Open Source Tool That Makes AI Writing Sound Human

The Problem with AI Writing: Telltale Signs

If you’ve read enough LLM-generated text, you start to notice a familiar pattern:

• Words like “testament,” “pivotal moment,” “evolving landscape”
• Phrases like “It’s not just X, it’s Y”
• The rule of three (three items in a list)
• Overuse of em dashes and bold text
• Faux-helpful phrases like “I hope this helps!”

Humanizer comes to solve this problem, transforming AI-generated text into something that reads as if written by a real human.

🔗 Official Repository: github.com/blader/humanizer

What is Humanizer?

Humanizer is a skill for both Claude Code and OpenCode that removes signs of AI-generated writing from text.

It’s based on Wikipedia’s “Signs of AI writing” guide, maintained by WikiProject AI Cleanup. This comprehensive guide comes from observations of thousands of instances of AI-generated text.

“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 source

How Humanizer Works

Three-Step Process

Voice Calibration

To match your personal writing style, you can provide Humanizer with a sample of your own writing:

/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-generated text to humanize]

The skill will analyze your sentence rhythm, word choices, and quirks, then apply them to the rewrite instead of producing generic “clean” output.

The 29 Detection Patterns

Humanizer implements 29 different detection patterns, organized into categories:

📝 Content Patterns (5 patterns)

🗣️ Language Patterns (7 patterns)

✍️ Style Patterns (7 patterns)

💬 Communication Patterns (3 patterns)

✂️ Filler and Hedging Patterns (3 patterns)

Full Example: AI Text → Human Text

Before (AI-sounding)

Great question! Here is an essay on this topic. I hope this helps!

AI-assisted coding serves as an enduring testament to the transformative potential of large language models, marking a pivotal moment in the evolution of software development. In today’s rapidly evolving technological landscape, these groundbreaking tools—nestled at the intersection of research and practice—are reshaping how engineers ideate, iterate, and deliver, underscoring their vital role in modern workflows.

At its core, the value proposition is clear: streamlining processes, enhancing collaboration, and fostering alignment. It’s not just about autocomplete; it’s about unlocking creativity at scale. The tool serves as a catalyst. The assistant functions as a partner. The system stands as a foundation for innovation.

• 💡 Speed: Code generation is significantly faster.
• 🚀 Quality: Output quality has been enhanced.
• ✅ Adoption: Usage continues to grow.

After (Humanized)

AI coding assistants can speed up the boring parts of the job. They’re great at boilerplate: config files and the little glue code you don’t want to write. They can also help you sketch a test, but you still have to read it.

The dangerous part is how confident the suggestions look. I’ve accepted code that compiled and passed lint, then discovered later it missed the point because I stopped paying attention.

If you treat it like autocomplete and review every line, it’s useful. If you use it to avoid thinking, it will help you ship bugs faster.

Installation

Claude Code

mkdir -p ~/.claude/skills
git clone https://github.com/blader/humanizer.git ~/.claude/skills/humanizer

OpenCode

mkdir -p ~/.config/opencode/skills
git clone https://github.com/blader/humanizer.git ~/.config/opencode/skills/humanizer

Note: OpenCode also scans ~/.claude/skills/ for compatibility, so a single clone into ~/.claude/skills/humanizer/ works for both tools.

Usage

Direct Command

/humanizer

[paste your text here]

Natural Language Request

Please humanize this text: [your text]

Voice Calibration (For Personal Style)

/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-generated text to humanize]

Why This Matters

📝 Improving Content Quality

Many blogs, websites, and academic papers are flooded with AI-generated text that reads as fake. Humanizer brings humanity back to writing.

🎓 Education and Academia

Instead of banning AI entirely, students can be taught how to polish and edit outputs to become authentic and readable.

🤝 Building Trust

Text that reads as human builds greater trust with readers. Humans prefer reading from humans (not robots).

🔓 Open Source and Free

18.3k stars on GitHub (and growing) – a massive community that believes in the humanization of AI writing. Everyone can use, modify, and improve Humanizer for free.

Credits and Sources

• Primary Source: Wikipedia: Signs of AI writing
• Maintaining Organization: WikiProject AI Cleanup

Humanizer is based on thousands of hours of human observation about how real humans actually write – and that’s what makes it different from any other “rewriting” tool.

Version History

Summary

Humanizer isn’t just another “rewriting” tool. It’s a roadmap for transforming cold, clichéd, instantly-recognizable-as-AI writing into text that reads like it came from a real human mind – because it’s based exactly on what humans do differently.

If you’re a writer, teacher, marketer, or developer using AI to generate text, this skill is essential for you.

Install Humanizer today, and make your AI writing sound human.

Quick Links

• GitHub – blader/humanizer
• Wikipedia: Signs of AI writing
• WikiProject AI Cleanup