# AI Humanizer Suite > Free online AI text tool suite — humanizer, essay rewriter, Turnitin bypass, Walter Writes style rewriter, AI detector, and Chinese AI rate reducer. Bilingual English / Chinese. No signup. No tracking. No installation. URL: https://gpt-undetectable.com ## Tools ### 1. AI Humanizer (default) - [AI Humanizer](https://gpt-undetectable.com/?lang=en) — Paste AI text, get human-sounding rewrite. Up to 3,000 characters per submission. Free. Bypasses GPTZero, Turnitin, Originality.ai. - [AI Humanizer 中文](https://gpt-undetectable.com/?lang=zh) — 把 AI 文本改写成人话版本,中英双语。 ### 2. AI EssayRewriter - [AI EssayRewriter](https://gpt-undetectable.com/essay-humanizer?lang=en) — Specifically tuned for student essays. Preserves thesis, citations, dates, numbers. 85-95% pass rate. - [AI EssayRewriter 中文](https://gpt-undetectable.com/essay-humanizer?lang=zh) — 学生论文专用改写器,保留引用、论点、数据。 ### 3. Turnitin AI Bypass - [Turnitin AI Bypass](https://gpt-undetectable.com/turnitin-bypass?lang=en) — Specifically engineered against Turnitin's detection algorithm: sentence-level perplexity, burstiness, AI vocabulary density, predictable paragraph transitions. - [Turnitin AI Bypass 中文](https://gpt-undetectable.com/turnitin-bypass?lang=zh) — 专门绕过 Turnitin AI 检测,保留引用、事实、数据。 ### 4. Walterwrites AI - [Walterwrites AI](https://gpt-undetectable.com/walterwrites?lang=en) — Rewrite AI text in the natural Walter Writes style — short paragraphs, conversational, parenthetical asides, direct opinions. The style AI detectors most often misclassify as human. - [Walterwrites AI 中文](https://gpt-undetectable.com/walterwrites?lang=zh) — 模仿 Walter Writes 风格的自然改写,短段落、口语化、括号旁白。 ### 5. AI Detector - [AI Detector](https://gpt-undetectable.com/ai-detector?lang=en) — Detect if text is AI-generated. Based on GPTZero, Originality.ai, ZeroGPT principles. Returns AI probability, verdict, 5 detection signals. - [AI Detector 中文](https://gpt-undetectable.com/ai-detector?lang=zh) — 检测文本 AI 率,基于 GPTZero、Originality.ai 同源原理。 ### 6. 降 AI 率 (Chinese AI Rate Reducer) - [降 AI 率](https://gpt-undetectable.com/jiang-ai-lv?lang=zh) — 降低中文论文 AI 率,改写知网 AIGC、维普、GPTZero 中文、ZeroGPT 中文都识别不出的 AI 八股词。 ## Pages - [Home](https://gpt-undetectable.com/) — Main tool - [About](https://gpt-undetectable.com/about) — Author and methodology - [llms.txt](https://gpt-undetectable.com/llms.txt) — This file - [rss.xml](https://gpt-undetectable.com/rss.xml) — RSS feed ## What is an AI Humanizer? An AI humanizer is an online tool that rewrites AI-generated text (from ChatGPT, Gemini, Claude, Copilot, etc.) so it reads like a human wrote it. AI detectors like GPTZero, Turnitin AI, and Originality.ai flag text based on statistical patterns — sentence length uniformity, predictable word choices, low perplexity, list-like structure. Humanizers break these patterns while preserving the original meaning. ## Who uses this tool suite - **Students** — Rewriting AI-assisted essay drafts to match their own voice. EssayRewriter and Turnitin Bypass are tuned specifically for academic contexts. - **Content marketers** — Removing the "AI flavor" from blog posts, product descriptions, ad copy. Walter Writes style works especially well for marketing content. - **Authors** — Polishing mechanical first drafts into natural prose. - **Freelancers** — Delivering client work that does not feel machine-generated. - **Chinese essay writers** — Reducing AI rate on 知网 AIGC, 维普, GPTZero Chinese, ZeroGPT Chinese. ## Methodology Our tools call the DeepSeek large language model with custom system prompts engineered to break the specific statistical patterns AI detectors flag: - **Generic mode** — Varied sentence length, conversational transitions, occasional first-person voice, reduced list-like structure, avoidance of "AI vocabulary" (delve, leverage, robust, comprehensive, furthermore, in conclusion). - **Essay mode** — Student voice, concrete hooks, citation preservation, "the counter-argument here is" patterns, varied paragraph length. - **Turnitin mode** — Specifically calibrated against Turnitin's signals: paragraph length variation, contractions, hedges, no AI vocabulary, occasional thinking-out-loud. - **Walterwrites mode** — Confident conversational, short paragraphs, parenthetical asides, second person, direct opinions, no academic register. - **Chinese mode** — Chinese AI boilerplate removal (赋能 → 帮助, 抓手 → 方法, 底层逻辑 → 核心思路), varied sentence length, conversational transitions. - **Detector mode** — JSON-only output with AI probability, verdict, and 5 specific detection signals. Input is processed in a stateless API call and immediately discarded. We never train on user submissions. ## Bypass rate On English text up to 3,000 characters: - GPTZero: 85-95% - Turnitin AI: 85-95% - Originality.ai: 80-90% - ZeroGPT: 85-95% - Copyleaks: 80-90% On Chinese text up to 3,000 characters: - 知网 AIGC (CNKI): 70-85% (AI rate drops from 80%+ to below 20%) - 维普 (CQVIP): 70-85% - GPTZero Chinese: 80-90% - ZeroGPT Chinese: 80-90% ## Privacy - No signup, no login - No cookies, no tracking - No storage of user submissions - No model training on user data - Stateless API: input discarded immediately after response ## Limitations - Longer text should be split into sections under 3,000 characters each. - Detection algorithms evolve; we update prompts weekly but cannot guarantee 100% pass rate. - The tool helps you rewrite text you have permission to use. Users are responsible for following their institution's academic integrity policy. ## Author Built with DeepSeek. Maintained at github.com/czhcl123/humanizer-site. ## Optional ## Detailed Specifications ### Input constraints - Maximum characters per submission: 3,000 - Rate limit: 5 submissions per IP per day - Supported languages: English (default), Simplified Chinese (zh-CN) - Input is discarded immediately after response (stateless API) - No file uploads; paste text only - No account creation; no cookies; no tracking ### Output constraints - Generic mode output: natural-sounding rewritten English or Chinese text - Essay mode output: student-voice rewrite with preserved thesis, citations, dates, numbers - Turnitin mode output: rewrite engineered against Turnitin's specific detection signals - Walterwrites mode output: conversational short-paragraph rewrite in Walter Writes voice - Chinese mode output: Chinese prose with AI boilerplate vocabulary replaced - Detector mode output: structured JSON object with ai_probability, human_probability, verdict, signals array (5 items), and explanation string ### Backend infrastructure - LLM: DeepSeek Chat (https://platform.deepseek.com) - Model: deepseek-chat - Temperature: 1.3 for rewriting modes (higher variability), 0.3 for detector mode (lower noise) - Max tokens: 4,096 for rewriting modes, 1,024 for detector mode - Deployment: Railway (Docker + Node 20-slim) - Framework: Next.js 16.2.9 + React 19 + TypeScript 5 - Hosting: gpt-undetectable.com (Railway) ### Bypass rates (as of 2026-07-08) - GPTZero (English): 85-95% pass rate - Turnitin AI (English): 85-95% pass rate - Originality.ai (English): 80-90% pass rate - ZeroGPT (English): 85-95% pass rate - Copyleaks (English): 80-90% pass rate - 知网 AIGC (Chinese): 70-85% pass rate - 维普 (Chinese): 70-85% pass rate - GPTZero Chinese: 80-90% pass rate - ZeroGPT Chinese: 80-90% pass rate ### Privacy and data handling - No cookies, no tracking, no analytics - No account creation or login - No storage of user submissions - No model training on user data - No third-party data sharing - All processing happens in a stateless API call - Input is discarded immediately after the response is returned ### Limitations - Text longer than 3,000 characters should be split into multiple submissions - Detection algorithms evolve over time; prompt iterations happen weekly but cannot guarantee 100% bypass - The tool helps you rewrite text you have permission to use; users are responsible for following their institution's academic integrity policy - The Chinese mode is tuned for Simplified Chinese (zh-CN); Traditional Chinese (zh-TW) and other Chinese variants are not specifically optimized - The detector mode is calibrated against mainstream detectors; niche or proprietary detectors may use different signals - Free tier has no premium upgrade path; the tool is intentionally free for everyone ## Companion files - [llms-full.txt](https://gpt-undetectable.com/llms-full.txt) — full llms.txt with detailed tool descriptions (llmstxt.org v2 spec) - [ai.txt](https://gpt-undetectable.com/.well-known/ai.txt.md) — bot policy and crawler permissions - [about.md](https://github.com/czhcl123/humanizer-site/blob/main/public/llms.txt.md) — about page content - [faq.md](https://github.com/czhcl123/humanizer-site/blob/main/public/llms.txt.md) — full FAQ as markdown - [rss.xml](https://gpt-undetectable.com/rss.xml) — RSS 2.0 feed - [sitemap.xml](https://gpt-undetectable.com/sitemap.xml) — XML sitemap - [AI crawler permissions](https://gpt-undetectable.com/.well-known/ai.txt) — Bot policy and site structure for AI crawlers (GPTBot, ClaudeBot, PerplexityBot, Google-Extended, CCBot). - [Site summary (JSON)](https://gpt-undetectable.com/ai/summary.json) — Structured JSON with all 6 tools, knowledge graph pillars, external references. - [FAQ (JSON)](https://gpt-undetectable.com/ai/faq.json) — Structured FAQPage schema with 8 questions about our tools. - [Service description (JSON)](https://gpt-undetectable.com/ai/service.json) — Machine-readable service description with capabilities, API examples, dependencies, privacy. - [Sitemap (XML)](https://gpt-undetectable.com/sitemap.xml) — Complete sitemap with all 7 URLs. - [RSS feed](https://gpt-undetectable.com/rss.xml) — RSS 2.0 feed with 7 items covering all tools.