Crafted with Care,Built for Every Tool

CJK to Unicode Converter

A bidirectional converter for CJK characters and Unicode code points. Supports multiple input formats to solve encoding issues in programming and text processing.

Pharmaceutical Company Lookup

Search pharmaceutical manufacturer records by company name or address, including licence, scope, and historical validity data.

UTF-8 BOM Checker

Detect and remove BOM signatures from UTF-8 files in one click. Fix parsing errors in PHP and optimize file compatibility.

Bulk File MD5 Changer

Efficiently change file MD5 hashes in bulk to generate brand new hash codes, solving issues like duplicate file checks and upload restrictions.

Bulk MD5 File Checker

Bulk calculate MD5 hash values for files to verify integrity and consistency. Supports simultaneous multi-file processing to ensure data security.

Batch File Encoding Checker

Batch detect text file encoding formats to fix garbled text. Supports common types like UTF-8 and GBK.

Serpent Encryption & Decryption Tool

A text encryption and decryption tool based on the Serpent algorithm, supporting multiple key lengths and operation modes.

CAST Algorithm Encryption and Decryption

A symmetric encryption and decryption tool based on the CAST-128 algorithm. Supports text and Base64 encoding conversion to ensure secure data transmission.

Blowfish Encryption & Decryption Tool

Encrypt or decrypt data online using the Blowfish symmetric algorithm to ensure privacy and security. Supports multiple encoding formats including UTF-8, Base64, and Hex.

Magnifier and Mirror

Use your phone camera to enlarge details in real time, with zoom, rear flashlight, and front camera mirror mode.

Magnetic Field Detector

Reads your phone’s magnetometer and shows magnetic field changes in µT, helping you find nearby magnetic objects and sources of interference.

Compass and Coordinates

Read device orientation and current location, and show heading, direction, and clickable latitude and longitude for copying.

Bubble Level

Uses your phone's motion sensors to show left-right and front-back tilt, with the bubble position helping you judge whether a surface is level.

Flashlight

Uses your phone's flashlight, with steady-on mode, SOS flashing, and brightness adjustment on supported devices.

Game Scoreboard

An online scoreboard for games, practice sessions, and friendly competitions. Edit the event and team names, adjust scores, undo mistakes, and use a pausable game timer.

Train Schedule and Seat Availability Query

Enter departure station, arrival station, and travel date to retrieve a train schedule and seat-availability snapshot. Actual service and ticketing are governed by 12306 and station notices.

Spam Phone Number Lookup

Enter an unknown phone number to check for spam or suspicious activity reports.

Pants Size Chart

Compare Chinese, European, waist measurements in centimeters and inches, and more to quickly find your pants size.

Online Pomodoro Timer

An online Pomodoro timer based on the classic rhythm of 25-minute focus sessions, 5-minute short breaks, and 15-minute long breaks, with pause, reset, skip, and full-screen controls.

Online Stopwatch Timer

Free online stopwatch timer with no download required. Features one-click start/stop, lap tracking, and easy time copying.

Days Lived Calculator

Calculate exactly how many days you've lived since your date of birth. This free online calculator supports custom start and end dates for fast, accurate results.

Business Days Calculator

Accurately calculate the number of business days by automatically excluding weekends and custom holidays.

Week of the Year Calculator

Quickly and accurately calculate what week of the year it is today.

World City Time

Real-time global city time tracker and time zone converter

Beijing Time Sync

Online tool to sync Beijing Time and UTC, accurately calculating the time difference.

Sunrise and Sunset Times by City

Accurately calculate sunrise and sunset times, as well as daylight hours, for any location worldwide. Supports 30 years of historical data.

Random Date Generator

Accurately generate random dates within a specified range, ideal for software testing and data simulation.

Lottery Prize Result Check

Enter a supported type, draw number, and ticket numbers for an auxiliary prize check.

Lottery Winning Numbers

View one published draw by lottery type and optional draw number.

Lottery Draw Information

Look up draw numbers, sales amount, and prize levels by lottery type, issue, or date.

Lottery Results & History

View up to 50 recent published draws for eight supported lottery types.

Enterprise Relationship Graph Query

Enter a company name, unified social credit code, registration number, or former name to retrieve returned company-relationship information. The result is informational only and is not a legal, investment, credit, or due-diligence conclusion.

Trademark Search

Search public trademark information by keyword and review matching records, application numbers, classes, dates, applicants, and reported status.

CNAPS Code to Bank Branch

Enter a 12-digit CNAPS code to identify the bank branch, bank, region, address, phone number, and logo.

Bank CNAPS Code Lookup

Find Chinese bank branch CNAPS codes, addresses, and phone numbers by bank, card number, location, or keyword.

World Currency Symbols and Names

Look up currency names and commonly used symbols by country to identify monetary units on bills, quotes, and documents.

Iron Deficit Calculator

Estimate your total elemental iron requirement based on body weight and the difference between current and target hemoglobin.

Adult Height and Weight Chart (2026 Edition)

Find a reference weight for your height and use BMI to check your healthy weight range

Calories Burned Calculator

Estimate calories burned based on your weight, activity, and workout duration

Child Height and Weight Chart (2026)

Look up reference height and weight ranges by age and sex to understand your child’s growth and track changes over time.

Hepatitis B Panel (5-Test) Report Analyzer

Enter your hepatitis B panel results to quickly interpret the report, assess infection status, and check immunity.

Women's Ideal Body Measurements Chart

Quickly estimate ideal bust, waist, and hip measurements by height and better understand your body proportions.

Diabetes Meal Planner Calculator

Estimate your daily calorie needs and macronutrient targets based on your personal profile to support diabetes meal planning.

Chinese Gender Predictor Chart (2026)

Predict your baby's gender in 2026 using the traditional Chinese Gender Chart. Simply enter the mother's lunar age and conception month. For entertainment purposes only, not scientifically proven.

Child Vaccination Schedule

Generate a personalized 0-6 year child vaccination schedule by birth date. Easily track your baby's immunization plan and never miss a shot.

My IP Address Checker

See the IP address this device presents to ToolKK, including its version, address scope, and browser network status.

Multiple Search Engine Tool

Enter one query and create direct links for Google, Bing, DuckDuckGo, GitHub, Wikipedia, YouTube, and other search services.

ICP Filing Lookup

Look up ICP filing reference information by domain, including filing entity, filing number, site title, reported status, review date, and paged records.

URL Unshortener

Paste a short link to quickly reveal the original long URL. Expand shortened URLs safely and check where they redirect before clicking.

Top-Level Domain (TLD) Directory

Search 900+ top-level domain suffixes worldwide in one place, including type, managing organization, and registration restrictions.

Domain Checker

Check domain DNS records and HTTP status codes online to quickly diagnose website connectivity and network issues.

Bulk Backlink Submitter

Bulk submit your website to high-authority platforms to quickly build backlinks and boost your SEO rankings.

Baidu Spider IP Checker

Verify if a visiting IP address belongs to a genuine Baidu Spider. Easily identify fake crawlers and validate bot identities with this free online checker.

Spider Crawl Simulator

Simulate search engine spiders to crawl web pages. Check HTTP crawl status, response headers, and view the raw HTML page source online.

Vertical Arithmetic Worksheet Generator

Generate printable vertical addition, subtraction, multiplication, and division worksheets with configurable ranges and answers.

立体图形分类游戏

观察面、棱与滚动特点，分类长方体、正方体、圆柱和球

上下左右位置游戏

在九宫格中辨认参照物的上面、下面、左边和右边

比大小互动天平

调节天平两侧数字，观察倾斜方向并判断大于小于或等于

100以内数与计数器

拨动十位和个位，结合十进制积木理解100以内数的组成

20以内进位与退位练习

随机练习20以内进位加法与退位减法，并查看方法提示

看图列式互动练习

根据物体分组与拿走过程选择答案，建立图像和算式的对应

数的分与合演示器

调整总数与部分数，观察分解图、圆点和加减算式的联系

认识人民币互动练习

点击人民币完成付款，练习元角换算、凑金额和找零

Online JSON to Excel Converter

Convert JSON arrays into downloadable CSV tables for easy viewing and editing in Excel

Excel to JSON Converter Online

Convert copied Excel cells into row-based JSON objects or arrays

Online .htaccess to Nginx Converter

Quickly convert Apache .htaccess rewrite rules, redirects, and access control directives into Nginx config for smooth website migration.

WeChat Official Account API Debugger

Build and validate common WeChat Official Account API requests in your browser, with URL, JSON preview, and copyable curl commands.

HTML Table Generator

Create HTML table code visually with drag-and-drop. Merge cells, customize styles, and copy the code in one click.

CSS3 Code Generator

Visually customize CSS3 effects like border radius, shadows, and gradients. Generate code in real time and apply it to your website in seconds.

Bootstrap Visual Layout Builder

Build Bootstrap grid layouts with drag and drop. Create page structures fast—no hand-coded HTML or CSS needed.

Popular JavaScript Libraries & CDN Links

Find CDN links for popular JavaScript libraries and copy ready-to-use code snippets to speed up frontend development.

Online JSON to TOML Converter

Quickly convert JSON data to TOML format. A free online tool perfect for migrating configuration files.

Online Teleprompter

An online teleprompter for speeches, live streams, and video recording. Paste long scripts, adjust the font size and scrolling speed, mirror the text, and pause or resume in full screen.

Pinyin and Stroke Order Copybook Generator

Create printable Chinese practice sheets with automatic pinyin, stroke-by-stroke order, tracing, and blank writing grids.

PDF to EPUB Converter

Convert text-based PDFs to reflowable EPUB ebooks with optional title, author, and language metadata.

Chinese Word Tracing Worksheet Generator

Create printable Chinese handwriting worksheets with model text, tracing practice, and blank writing grids

Excel to Phone Contacts Converter | Excel to vCard Tool

Convert an Excel contact list into a vCard file you can import into your phone.

Online PDF Viewer

Open and read local PDF files in your browser with page navigation, fit modes, document metadata, printing, and download.

Snake Case & Camel Case Converter

Quickly convert between snake_case and camelCase naming, supports batch processing and common edge cases.

Vertical Text Converter

Convert horizontal text into traditional vertical layout, great for calligraphy, classical Chinese, and poster design.

Lanzou Cloud Direct Link Parser

Enter a Lanzou Cloud share link to instantly extract the real direct link for easy downloading or external linking.

Image Advertisement Detection

Screen one image for watermarks, QR codes, barcodes, mini-program codes, and related ad signals.

Image Tamper Risk Detection

Upload one image to screen for possible editing and inspect confidence, regions, and a heatmap.

Traditional Japanese Colors & Color Palette

Explore traditional Japanese color names and values for websites, posters, presentations, and interior color schemes.

Traditional Chinese Color Palette

Explore over 500 traditional Chinese color names, hex codes, and color schemes for design, home decor, and social media content.

Solid Color Image Generator

Free online solid color image generator for any color and size, supports PNG/JPG download, perfect for placeholder images and background creation.

Letter Icon Generator

Input text to quickly generate circular or rounded square letter icons suitable for website icons, avatars, UI elements.

Placeholder Image Generator

Quickly generate custom placeholder images with specific sizes, colors, and text. Perfect for web prototyping, documentation, and frontend development.

Email Icon Generator

Enter an email address to generate a custom email icon in one click, great for personal branding and websites.

TV Color Gamut Converter

Convert values between different color gamut standards (NTSC, sRGB, DCI-P3, Adobe RGB, BT.2020) online, helping you understand color gamut parameters of TVs and displays.

Scrolling Text Sign

Turn your phone or computer into a full-screen scrolling text display. Customize the message, font size, speed, background theme, and text color, or pause the animation at any time.

Online Digital Wooden Fish

Tap a realistic digital wooden fish to increase your merit count. Features authentic strike sounds, mute controls, auto-tapping, rhythm options, and fullscreen mode.

在线俄罗斯方块游戏 - 经典消行与等级挑战

经典十列二十行俄罗斯方块，支持键盘、触屏和等级加速。

在线贪吃蛇游戏 - 多难度与触屏操控

经典贪吃蛇玩法，支持三档速度、障碍、触屏和本地最高分。

Online Chinese Chess (Xiangqi)

Play Chinese chess online in local two-player or simple computer mode, with legal-move hints, undo, and restart controls.

在线三阶魔方游戏 - 打乱、转动与步骤还原

在线转动三阶魔方六个面，支持打乱、撤销和历史还原。

在线七巧板游戏 - 自由拼图与创意训练

拖动七块标准拼板，自由旋转、翻转和组合图形。

Play Sokoban Online

Play the classic Sokoban puzzle game online with multiple levels, keyboard and touch controls, move and push tracking, unlimited undo, and instant restarts.

Online Sliding Number Puzzle

Play a sliding number puzzle online with solvable 3×3, 4×4, and 5×5 boards, move and time tracking, keyboard controls, and multi-step undo.

Online M3U8 Player

Paste an M3U8 link and play HLS video streams instantly. No plugins needed—ideal for testing live streams and previewing video segments.

Text to Speech

Turn text into natural-sounding voiceovers in seconds. Choose from multiple voices and adjust the speaking rate for videos, audiobooks, announcements, and more.

Audio Editor

Trim, join, and adjust audio right in your browser—no software installation required. Import and export popular audio formats with ease.

Screen Recorder Pro

Record your screen with camera picture-in-picture, system audio and microphone mixing, up to 4K/60fps, timed capture, and multiple recording management.

Screen Recorder

Record your computer screen online for free with no watermarks and export high-quality HD videos.

Adjust Video Volume

Precisely adjust the audio track volume of your video files with support for ±24dB lossless adjustments.

AI Video Style Transfer

AI-powered video art style transfer tool with multiple special effect filters.

Video Speed Controller

Precisely adjust video playback speed with support for 0.1x to 4x processing.

Rotate Video

Accurately adjust video orientation and fix portrait to landscape misalignment.

AI Homework Grading

Upload one K–12 homework or worksheet image to receive question-level status, reasons, and task statistics.

AI Article Rewriter

Rewrite sentences and refine wording while preserving the original meaning. Quickly create natural, human-sounding text with less repetitive phrasing.

AI Text Summarizer

Turn long articles and reports into concise summaries. AI analyzes the meaning, extracts key points and essential details, and creates a clear summary in one click.

AI Multilingual Text Translator

Enter your text and get an accurate, natural translation in seconds while preserving its context, tone, and professional style.

AI SEO Meta Tag Generator

Enter a page topic and let AI generate search-friendly title tags, meta descriptions, and keywords to improve visibility and click-through rates.

AI Weekly Work Report Generator

Enter your daily highlights and progress updates, and AI will turn them into a polished, structured weekly report ready to submit.

Image to Text Extractor

AI-powered image text recognition to extract editable text in one click.

Portrait Background Remover

Smart AI tool to separate portraits from backgrounds, generating transparent PNGs with custom size scaling support.

Image People Counter

Use AI to count the number of people in an image. Supports JPG/PNG uploads and image resizing for accurate counting results.