AI Tool

Stealth Humanizer Review

Stealth Humanizer is a free, open-source AI text humanizer that operates entirely in the browser, ensuring no login, limits, or server-side data storage.

shipped Sep 13, 2026free

Domain rating93Monthly visits2/mo

Why it matters

1Operates entirely in-browser, ensuring no server-side data storage.

2Supports 35 AI providers and over 16 languages for text humanization.

3Offers style-aware rewriting with a multi-pass 'ninja mode' for advanced transformations.

4Provides instant humanization, grammar checking, and detection scores for output.

Specs

GitHub

View Repository →

API Available

Yes, public API

overview

What is Stealth Humanizer?

Stealth Humanizer is an AI text humanizer tool developed as an open-source project that enables users to transform AI-generated text into natural writing. It operates entirely in the browser, ensuring no login, limits, or server-side data storage, and supports 35 AI providers for style-aware rewriting.

features

Key Features of Stealth Humanizer

Stealth Humanizer provides a comprehensive set of features designed to transform AI-generated text into human-like content while maintaining privacy and flexibility.

Instant humanization of AI-generated text.
Grammar checking functionality for refined output.
Support for over 16 languages, enhancing global applicability.
Ability to upload PDF and DOCX files for processing.
Style-aware rewriting with a multi-pass 'ninja mode' for advanced text transformations.
Provides detection scores for humanized text, indicating its likelihood of bypassing AI detectors.
Privacy Mode for offline local rewriting without requiring an API key.
Self-hostable, allowing users to run the tool on their own infrastructure.
Available as a Chrome Extension for direct browser integration.

use cases

Who Should Use Stealth Humanizer?

Stealth Humanizer is designed for various users who need to transform AI-generated text into natural, human-like content, particularly to bypass AI detection systems and improve readability.

Students and Writers: To humanize AI-assisted work, ensuring it passes academic integrity checks and reads naturally, especially for content generated with AI tools.
Content Creators and Professionals: To produce high-quality, original content that avoids being flagged as AI-generated by search engines or other platforms, thereby improving readability and SEO.
Non-Native English Speakers: To protect against false positives from AI detectors, which may exhibit bias against simpler vocabulary and uniform structures often used by ESL writers, ensuring their content is perceived as human-written.

how to use

How to Use Stealth Humanizer

To use Stealth Humanizer, users can access the web interface or the Chrome Extension, paste their AI-generated text, and apply various humanization settings.

1Navigate to the Stealth Humanizer web application at https://stealthhumanizer.vercel.app/ or install the Chrome Extension.
2Paste the AI-generated text directly into the input field or upload a PDF/DOCX file.
3Select desired writing styles, tones, and humanization levels (e.g., Light to Ninja mode).
4Initiate the humanization process to transform the text.
5Review the humanized text, which includes detection scores, and make any further edits.
6Utilize the grammar checking feature to refine the output before final use.

pricing

Stealth Humanizer Pricing & Plans

Stealth Humanizer is offered completely free of charge, operating as an open-source project without any subscription tiers or usage-based fees. This model ensures full accessibility and eliminates financial barriers for users.

Free: Open-source, no login required, no limits, no server-side data storage, supports 35 AI providers, style-aware rewriting, multi-pass ninja mode, instant humanization, grammar check, 16+ languages.

Pros

+Completely free and open-source, eliminating cost barriers.
+Ensures user privacy with in-browser operation and no server-side data storage.
+Supports a wide range of AI providers (35) and over 16 languages.
+Offers advanced rewriting capabilities, including multi-pass 'ninja mode' and style-aware transformations.
+Provides practical features like grammar checking, PDF/DOCX uploads, and detection scores.
+Self-hostable and available as a Chrome Extension for flexible deployment and access.

Cons

−Specific user reviews for the open-source version are not widely available, making external reception assessment difficult.
−Effectiveness against the most advanced and frequently updated AI detectors (e.g., Originality.ai, Turnitin) may vary, as indicated by general market trends for humanizer tools.
−Output quality, while improved in version 2.3, may still require manual review for optimal naturalness and grammatical correctness in complex contexts.
−Relies on user-provided API keys for some functionalities, which might be a barrier for users without existing AI provider accounts.
−The project's open-source nature means support and feature development are community-driven, potentially leading to less predictable updates compared to commercial tools.

Similar Tools

Stealth Humanizer vs Competitors

Stealth Humanizer distinguishes itself in the market by being a completely free, open-source, and in-browser solution, contrasting with many commercial alternatives that offer tiered pricing and server-side processing.

Undetectable AIOn Stork

It focuses on making AI-generated text undetectable by common AI detectors, offering a 'human score' and 'readability score' for the output.

While it offers a free tier for limited use, Stealth Humanizer is entirely free and open-source without any usage limits. Undetectable AI provides more explicit metrics on detectability, which Stealth Humanizer implies through its 'ninja mode'.

Bypass AIOn Stork

This tool specializes in rewriting AI content to bypass detection by various AI content detectors, aiming for a human-like quality.

Bypass AI offers a free trial with a word limit, whereas Stealth Humanizer is completely free and open-source with no limits. Bypass AI might offer a more streamlined focus on detector evasion, but Stealth Humanizer provides broader style and tone adjustments.

AI Humanizer Pro↗

It aims to transform AI-generated text into human-like content that can bypass AI detection, offering various modes like 'Standard', 'Enhanced', and 'Premium'.

AI Humanizer Pro has a free tier with a word count limit, unlike Stealth Humanizer which is entirely free and open-source. Stealth Humanizer operates fully in the browser without server-side storage, which AI Humanizer Pro does not explicitly guarantee.

Humbot↗

Humbot focuses on humanizing AI text to make it undetectable by AI detectors, providing options for different writing styles and tones.

Humbot offers a free trial with a word limit, while Stealth Humanizer is completely free and open-source. Stealth Humanizer's in-browser operation ensures no data leaves the user's device, a privacy aspect Humbot doesn't emphasize as strongly.

See every Stealth Humanizer alternative, compared→

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