Nihendiao Tools
A useful collection for images, writing, development, and learning.
Quick access
Everyday essentials
All tools
Content & WeChat
WeChat Article Formatter
Turn Markdown or plain text into WeChat-ready rich text locally, with themes, typography, HTML copy, and download.
Knowledge Card Generator
Convert notes, quotes, and Markdown into shareable local cards with themes plus PNG and SVG export.
Markdown Editor
Write Markdown with live preview, headings, tables, code blocks, theme switching, and copy options.
WeChat Cover Generator
Create WeChat article covers locally with custom size, background, filters, text, tags, and PNG export.
Text Counter & Cleaner
Count characters, lines, reading time, remove blank or duplicate lines, and convert text case locally.
Smart Teleprompter
Create adjustable scrolling scripts for recording with layout, speed, color, and WebM recording options.
Images & Media
Batch Image Processor
Batch convert image formats, compress files, resize dimensions, and download everything as a ZIP locally.
Video to GIF
Convert video clips into GIFs locally with duration trimming, size reduction, frame rate control, and download.
Polaroid Photo Maker
Upload a photo or use the camera to create retro Polaroid frames, filters, captions, and downloads.
Bead Pattern Generator
Convert images into local bead pattern grids with palettes, color limits, dithering, sizing, and shopping lists.
Image Size Templates
Common sizes for WeChat, Xiaohongshu, Bilibili, YouTube, and Open Graph with PNG/SVG guides.
Images to PDF
Merge multiple images into a local PDF with sorting, page size, margins, fitting, and compression quality.
Color Toolbox
Convert HEX, RGB, and HSL, preview opacity, check contrast, and generate color ramps locally.
Developer Debugging
QR Code Generator
Generate local QR codes for text, links, Wi-Fi, contact cards, email, and phone numbers with PNG/SVG export.
JSON Formatter
Format, validate, minify, sort, and convert JSON to TypeScript types locally in the browser.
Regex Tester
Test JavaScript regular expressions locally with flags, match highlighting, capture groups, and replace preview.
JWT Decoder
Decode JWT header, payload, expiration, and signature segments locally in the browser.
UUID Generator
Generate UUID v4 values locally in batches with casing, compact format, copy, and download.
Cron Helper
Parse 5-field Cron expressions locally and preview readable schedules plus upcoming runs.
Hash Digest Tool
Calculate SHA-1, SHA-256, SHA-384, SHA-512, and CRC32 digests for text and files locally.
Timestamp Converter
Convert Unix seconds, milliseconds, ISO strings, and local time for logs and API debugging.
Data Conversion
Text Diff Checker
Compare two text blocks locally and show line-level additions, deletions, and unchanged content.
CSV / JSON / Markdown Converter
Convert CSV to JSON or Markdown tables locally, and export JSON arrays back to CSV.
YAML / JSON Converter
Convert YAML and JSON locally with formatting and copy support for configuration files.
URL Parser
Parse URL protocol, host, path, hash, and query parameters locally with JSON copy support.
Encode & Decode Toolbox
Encode, decode, copy, and download Base64, URL, HTML Entity, and Unicode escape text locally.
AI & Hardware
Free LLM API Resources
Compare large language model API providers with free tiers or trial credits for quick developer testing.
PC Build Planner
Create PC part lists, track component prices, and export a shareable build sheet.
AI Hardware Ranking
A home-user ranking for local AI GPUs and systems, filtered by VRAM, ecosystem, power, and use case.
Top AI Directory
Browse and filter 100+ AI products with search, categories, sorting, link copy, and local additions.
Daily Utilities
Random Password Generator
Generate strong passwords locally with length, character sets, batch output, copy, and download.
Pomodoro Timer
A local focus timer with work, break, custom duration, task notes, sound, notification, and daily stats.
Unit Converter
Convert length, weight, area, volume, temperature, storage, speed, and time units locally.
Browser Info Viewer
View User Agent, screen, viewport, language, timezone, storage, and compatibility info locally.
Healthy Diet Guide
A BMI, regional recipe, and weekly meal planning helper based on adult weight management guidance.
Chinese
Chinese Practice Grid
Create and print chinese practice grid worksheets in your browser. No uploads or account required.
Pinyin Writing Paper
Create and print pinyin writing paper worksheets in your browser. No uploads or account required.
Chinese Copybook
Create and print chinese copybook worksheets in your browser. No uploads or account required.
Stroke Practice
Create and print stroke practice worksheets in your browser. No uploads or account required.
Dictation Worksheet
Create and print dictation worksheet worksheets in your browser. No uploads or account required.
Picture Writing
Create and print picture writing worksheets in your browser. No uploads or account required.
Composition Paper
Create and print composition paper worksheets in your browser. No uploads or account required.
Math
Mental Arithmetic
Create and print mental arithmetic worksheets in your browser. No uploads or account required.
Column Arithmetic
Create and print column arithmetic worksheets in your browser. No uploads or account required.
Unit Conversion Practice
Create and print unit conversion practice worksheets in your browser. No uploads or account required.
Multiplication Table
Create and print multiplication table worksheets in your browser. No uploads or account required.
Clock Reading
Create and print clock reading worksheets in your browser. No uploads or account required.
Sudoku Worksheets
Create and print sudoku worksheets worksheets in your browser. No uploads or account required.
Coordinate Paper
Create and print coordinate paper worksheets in your browser. No uploads or account required.
English
Classroom
Mistake Review
Create and print mistake review worksheets in your browser. No uploads or account required.
Coloring Pages
Create and print coloring pages worksheets in your browser. No uploads or account required.
Classroom Poster
Create and print classroom poster worksheets in your browser. No uploads or account required.
Music Staff Paper
Create and print music staff paper worksheets in your browser. No uploads or account required.
Class Timetable
Create and print class timetable worksheets in your browser. No uploads or account required.
Seating Chart
Create and print seating chart worksheets in your browser. No uploads or account required.
Award Certificate
Create and print award certificate worksheets in your browser. No uploads or account required.
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A toolbox for everyday work and learning
Free tools for image processing, text editing, development and printable worksheets. Most file and text processing runs locally in your browser.