Start with a specific task
Open pinyin, HSK lookup, conversion, grammar, or email writing directly.
Study Chinese in one workspace.
Convert text, look up HSK words, fix grammar, and keep every useful result in the same place.
Chinese Pinyin
Simplified-Traditional Chinese Converter
HSK Vocabulary
Grammar Checker
Email Rewriter
Chinese Pinyin
Simplified-Traditional Chinese Converter
HSK Vocabulary
Built for learners who already use Chinese.
The product focuses on frequent Chinese learning and writing tasks: checking wording, understanding vocabulary, converting scripts, and making messages sound natural.
NiuTools keeps each language task focused, then saves the useful result so it can become part of your study history.
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Start free. Upgrade when you need more AI help.
From quick lookup to saved review.
Work with the result in place
Input, output, copy, save, and AI use limits stay visible on the same screen.
Understand text
Use pinyin, HSK lookup, and script conversion when reading or reviewing Chinese.
Chinese-specific tools before generic AI chat
Pinyin, conversion, and HSK lookup do not need AI uses. Ask and model-backed writing tools show their AI use cost before each run.
Choose a tool
#1
Chinese Pinyin
Convert Chinese characters into pinyin for reading practice, vocabulary notes, and learner-friendly study workflows.
#2
Simplified-Traditional Chinese Converter
Convert Chinese text between Simplified and Traditional characters while preserving the original sentence structure.
#3
HSK Vocabulary
Search HSK vocabulary with pinyin, level information, and available learning context for review.
#4
Grammar Checker
Check Chinese learner writing for grammar issues, word order problems, and more natural phrasing.
#5
Email Rewriter
Rewrite Chinese email drafts with a clearer tone for polite, professional, formal, or friendly situations.
Start with the exact Chinese task.
Grammar Checker
AI WRITING
AI USES
HSK Vocabulary
FREE TOOLS
NO AI USES
Our ClientReviews
LANG SCHOOL
We use it to review student writing. The fixes feel more natural and easier to explain in class.
Mia Chen
Program Lead
SELF LEARNER
The workspace and history are the biggest win. I no longer repeat the same lookups and copy-paste loops.
David Lin
Chinese learner
GLOBAL TEAM
It saves a huge amount of time when we draft Chinese emails and need a more natural tone for real communication.
Sofia Wang
Operations Manager
HSK COHORT
Once we connected vocabulary lookup, pinyin conversion, and writing support in one flow, learners stayed much more consistent from task to task.
Leo Zhang
Learning Program Advisor
TEACHER STUDIO
History and favorites save us the most time. We can return to useful results quickly and turn them into lesson material without starting over.
Nina Wu
Chinese Teacher
LANG SCHOOL
We use it to review student writing. The fixes feel more natural and easier to explain in class.
Mia Chen
Program Lead
SELF LEARNER
The workspace and history are the biggest win. I no longer repeat the same lookups and copy-paste loops.
David Lin
Chinese learner
Free tools stay free. Plus adds monthly AI uses.