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102+
free tools available online
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最近使用

Popular Tools

Most used tools in the community

💵

Tip Calculator

Calculate tip, total and per-person share with custom tip rate and party size.
⬜

Border Radius Generator

Visually generate CSS border-radius with independent corner control and copy code.
💾

Data Size Converter

Convert between KB, MB, GB, TB and more. Supports decimal and binary standards.
⛽

Fuel Cost Calculator

Calculate trip fuel cost from distance, consumption and fuel price.
📋

XML Formatter

Beautify XML code with proper indentation
✂️

Punctuation Remover

Remove Chinese and English punctuation from text
🍅

Pomodoro Timer

Pomodoro technique timer with 25-min focus and 5-min break cycles. Customizable.
⏱️

Stopwatch

Online stopwatch with start, pause, lap and reset. Millisecond precision.

Why Choose Us

Fast, secure, and completely free online tools

Instant Use

No download or installation needed, just open your browser

Secure & Reliable

Data processed locally, never uploaded to servers

AI Powered

Smart AI tools for more efficient creation

All Tools

Curated online tools, organized by category for easy discovery

⬜

Border Radius Generator

Visually generate CSS border-radius with independent corner control and copy code.

Developer Tools
💵

Tip Calculator

Calculate tip, total and per-person share with custom tip rate and party size.

Other Tools
⛽

Fuel Cost Calculator

Calculate trip fuel cost from distance, consumption and fuel price.

Other Tools
🔥

Calorie Calculator

Calculate daily calorie needs from weight, height, age and activity level.

Other Tools
⏳

Countdown Timer

Online countdown timer with custom hours, minutes and seconds, alarm on finish.

Other Tools
🍅

Pomodoro Timer

Pomodoro technique timer with 25-min focus and 5-min break cycles. Customizable.

Other Tools
⏱️

Stopwatch

Online stopwatch with start, pause, lap and reset. Millisecond precision.

Other Tools
🏷️

Discount Calculator

Calculate discounted price and savings. Supports percentage and amount-off modes in real time.

Other Tools
💱

Currency Converter

Convert between major world currencies with customizable exchange rates.

Format Conversion
🌍

Timezone Converter

Convert time between major world timezones and cities in real time.

Developer Tools
💾

Data Size Converter

Convert between KB, MB, GB, TB and more. Supports decimal and binary standards.

Format Conversion
🔄

Palindrome Checker

Check if text reads the same forwards and backwards. Ignore spaces and case options.

Text Editing & Processing
View all 102 tools
⬜

Border Radius Generator

Visually generate CSS border-radius with independent corner control and copy code.

Developer Tools
🌍

Timezone Converter

Convert time between major world timezones and cities in real time.

Developer Tools
🖧

MAC Address Generator

Generate random MAC addresses in bulk with custom OUI prefix and format.

Developer Tools
🕸️

Subnet Calculator

Calculate network address, broadcast, usable hosts and mask from IP and CIDR prefix.

Developer Tools
📦

CSS Box Shadow Generator

Visually generate CSS box-shadow with offset, blur, spread, color and inset. Copy code.

Developer Tools
🔒

ROT13 Cipher

ROT13 is a symmetric letter-substitution cipher for simple encoding and decoding.

Developer Tools
🏛️

Caesar Cipher

Caesar cipher encoder/decoder with custom shift. Classic substitution cipher with brute-force all shifts.

Developer Tools
🔢

Number Base Converter

Convert between binary, octal, decimal and hexadecimal. Supports decimals and large integers in real time.

Developer Tools
View all 33 tools
💵

Tip Calculator

Calculate tip, total and per-person share with custom tip rate and party size.

Other Tools
⛽

Fuel Cost Calculator

Calculate trip fuel cost from distance, consumption and fuel price.

Other Tools
🔥

Calorie Calculator

Calculate daily calorie needs from weight, height, age and activity level.

Other Tools
⏳

Countdown Timer

Online countdown timer with custom hours, minutes and seconds, alarm on finish.

Other Tools
🍅

Pomodoro Timer

Pomodoro technique timer with 25-min focus and 5-min break cycles. Customizable.

Other Tools
⏱️

Stopwatch

Online stopwatch with start, pause, lap and reset. Millisecond precision.

Other Tools
🏷️

Discount Calculator

Calculate discounted price and savings. Supports percentage and amount-off modes in real time.

Other Tools
🎲

Dice Roller

Roll multiple dice with custom faces online. Fair random results for games and draws.

Other Tools
View all 16 tools
💱

Currency Converter

Convert between major world currencies with customizable exchange rates.

Format Conversion
💾

Data Size Converter

Convert between KB, MB, GB, TB and more. Supports decimal and binary standards.

Format Conversion
01

Text to Binary

Convert text to binary code with UTF-8 support. Real-time conversion, perfect for learning encoding and debugging.

Format Conversion
🔤

Binary to Text

Decode binary code back to readable text with UTF-8 support. Real-time decoding, the reverse of text to binary.

Format Conversion
#️⃣

Hex to Text

Decode hexadecimal code to readable text with UTF-8 support. Real-time decoding for debugging and analysis.

Format Conversion
📻

Morse Code Converter

Convert text to Morse code and back. Supports letters, numbers and common punctuation with custom separators.

Format Conversion
📝

HTML to Markdown

Convert HTML to Markdown format

Format Conversion
📈

JSON to CSV Converter

Convert JSON array data to CSV format

Format Conversion
View all 17 tools
🔄

Palindrome Checker

Check if text reads the same forwards and backwards. Ignore spaces and case options.

Text Editing & Processing
🌐

Text to HTML

Convert plain text into HTML paragraphs with automatic escaping of special characters.

Text Editing & Processing
✂️

Punctuation Remover

Remove Chinese and English punctuation from text

Text Editing & Processing
🔤

Text Sorter

Sort text lines alphabetically, by length, or randomly

Text Editing & Processing
↩️

Line Break Remover

Remove line breaks from text, optionally keep paragraph breaks

Text Editing & Processing
🔗

Slug Generator

Convert titles to URL-friendly slugs

Text Editing & Processing
📊

Word Frequency Analyzer

Analyze word frequency in text, supports Chinese and English

Text Editing & Processing
🔄

Text Reverser

Reverse text by character, word, or line

Text Editing & Processing
View all 14 tools
📊

Barcode Generator

Generate Code128 barcodes online with custom size and color. Live preview and PNG download.

Image & Media
📷

QR Code Reader

Decode QR codes from images or camera locally. Privacy-friendly, no upload to server.

Image & Media
👁️

Color Contrast Checker

Check foreground/background contrast against WCAG standards with AA/AAA rating.

Image & Media
🖼️

Image Resizer

Resize images online with custom dimensions

Image & Media
⭐

Favicon Generator

Generate website favicon from text or letters

Image & Media
📋

Image Metadata Viewer

View image dimensions, format, file size and more

Image & Media
🔗

Image to Base64

Convert images to Base64 encoded strings

Image & Media
🌈

CSS Gradient Generator

Visual CSS gradient generator for linear and radial gradients

Image & Media
View all 12 tools
🖼️

PDF to Image

Convert PDF pages to PNG images (local processing)

PDF & Office Documents
📄

Image to PDF

Merge multiple images into a PDF file (local processing)

PDF & Office Documents
📖

PDF Text Extractor

Online PDF text extraction tool. Upload a PDF to extract its text content, with support for copying or downloading as a TXT file.

PDF & Office Documents
📐

PDF Rotate Pages

Online PDF page rotation tool, allows rotating a single page or batch rotating all pages, supporting 90°/180°/270° rotation angles.

PDF & Office Documents
📱

QR Code Generator

Quickly generate QR codes, supporting URLs, text, WiFi configurations, etc., with customizable colors and sizes

PDF & Office Documents
📄

PDF Merge

Merge multiple PDF files into one document online, free and watermark-free

PDF & Office Documents
🗜️

PDF Compression

Compress the size of PDF files online, reducing volume while maintaining quality

PDF & Office Documents
🤖
PRO AI

AI Writing Assistant

AI intelligent writing, supports copy generation, article continuation, title creation, and SEO optimization suggestions

AI Smart Tools
🔊
PRO AI

Text to Speech

Online text to speech tool, supporting multiple voices and speed adjustments

AI Smart Tools
📊
PRO AI

SEO Content Factory

AI-driven SEO content generation tool, automatically generates optimized articles

AI Smart Tools

Latest Posts

Tips, tutorials and updates

tool-tutorials 2026-09-09

Beware! Your IP Address Is Exposing Your Home Address

An IP address is not just a meaningless string of numbers; it's like your home's network house number. With lookup tools, it can directly locate your city, street, or even residential complex. Everyday activities like browsing, commenting, or connecting to Wi-Fi can leak your IP, which, if exploited, can lead to harassment or even fraud. This article reminds everyone not to casually fill in personal information, to be cautious with public networks, to change default device passwords, and suggests checking your own IP to see what's exposed, raising awareness to protect privacy.

#IP地址查询 #IP泄露风险 #网络安全 Read more
tool-tutorials 2026-09-09

The days of not understanding JSON formatting and being blamed by colleagues are over

This article explains in plain language the practical value of JSON formatting tools. Starting from daily scenarios like colleagues shifting blame, taking over messy projects, and integration testing comparisons, it shows that formatting tools can help you clarify data, quickly report errors, and precisely compare differences, saving time and effort while avoiding blame. It emphasizes that knowing how to use tools is true intelligence, teaching you to solve the most annoying problems with minimal cost, and saying goodbye to the hard days of searching through messy JSON.

#JSON格式化工具 #JSON校验 #JSON对比 Read more
tool-tutorials 2026-09-09

Changed a JS compression config, online errors dropped by 80%

Frequent JS errors online? Don't rush to blame the logic; 80% of the time it's the compression config causing trouble. This article uses real cases to show you how the compressor's default "smart" settings can ruin old projects, from mis-deleting conditional branches to messing up variable names. Step-by-step, I'll teach you to turn off a few key optimization options, cutting error rates by 80% while only increasing code size by 15%, in exchange for stable operation—totally worth it.

#JS压缩配置 #前端报错优化 #Webpack压缩 Read more

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