Understand text
Use pinyin, HSK lookup, and script conversion when reading or reviewing Chinese.
Choose the tool that matches the task.
Choose a focused Chinese tool for pinyin conversion, Simplified and Traditional Chinese conversion, HSK vocabulary lookup, grammar checking, email rewriting, and saved review.
AI tools for clearer Chinese writing.
Fast utilities for daily study.
Chinese to Pinyin ConverterConvert Chinese characters into pinyin for reading practice, vocabulary notes, and learner-friendly study workflows.你好, 世界 -> ni hao, shi jieFreeSimplified Traditional Chinese ConverterConvert Chinese text between Simplified and Traditional characters while preserving the original sentence structure.学习中文 -> 學習中文FreeCantonese Jyutping ConverterConvert Chinese characters into Cantonese Jyutping for pronunciation checks, reading practice, and copyable study notes.廣東話 -> gwong2 dung1 waa2FreeRMB Uppercase ConverterConvert amounts such as 1, 1.05, or 一元 to uppercase RMB—and convert uppercase RMB back to numbers—without using AI.1 元 ⇄ 壹圆FreeHSK Vocabulary LookupSearch HSK vocabulary with pinyin, level information, and available learning context for review.HSK 4 / context / examplesFreeChinese Idiom LookupSearch a validated core collection of Chinese idioms with pinyin, English meaning, HSK context, and example sentences when available.画蛇添足 / pinyin / meaningFree
AI tools for clearer Chinese writing.
Chinese Grammar CheckerCheck Chinese learner writing for grammar issues, word order problems, and more natural phrasing.Correction + natural rewriteAI usesChinese Email RewriterRewrite Chinese email drafts with a clearer tone for polite, professional, formal, or friendly situations.Polite / Professional / FormalAI uses
From quick lookup to saved review.
NiuTools keeps each language task focused, then saves the useful result so it can become part of your study history.
#1Start with a specific task
#2Work with the result in place
#3Return to useful work later
Built for learners who already use Chinese.
Improve writing
Fix grammar, word order, tone, and message clarity without leaving the study flow.
Keep progress
Save results, revisit history, and build a reusable workspace around repeated tasks.
Choose the tool that matches the task.
Chinese PinyinConvert Chinese characters into pinyin for reading practice, vocabulary notes, and learner-friendly study workflows.
HSK VocabularySearch HSK vocabulary with pinyin, level information, and available learning context for review.
Grammar CheckerCheck Chinese learner writing for grammar issues, word order problems, and more natural phrasing.
Email RewriterRewrite Chinese email drafts with a clearer tone for polite, professional, formal, or friendly situations.
FAQ
What is NiuTools?
NiuTools is a focused workspace for Chinese learning tasks: pinyin, simplified and traditional conversion, HSK vocabulary lookup, Ask, grammar review, and Chinese email rewriting.
Which tools are free?
Pinyin, Simplified / Traditional Converter, and HSK Vocabulary Lookup are free core tools. They do not spend AI uses.
What counts as an AI use?
Ask messages count as 1 use, Grammar Quick Fix counts as 1 use, Grammar Deep Review counts as 2 uses, and Email rewrite/regenerate counts as 1 use per 500 characters.
What is included in Free?
Free includes unlimited core tools and 15 AI uses per month for trying Ask and writing workflows.
What does Plus add?
Plus adds 300 AI uses per month for regular Ask and AI writing workflows, plus cloud history, favorites, and priority processing.
What happens if I use all my AI uses?
Free core tools keep working. AI actions pause until the next monthly reset or until a larger plan is available.
Do I need an account?
No. You can open the workspace and use core tools without signing in. Sign in when you want cloud sync, account settings, AI usage tracking, or paid plan access.
Does NiuTools replace a Chinese course?
No. NiuTools is built for repeated study tasks and writing support. It works best alongside a course, tutor, textbook, or self-study routine.