Leaderboard - YunBug Toolbox

MD5 Online Decrypt

This MD5 online decryption tool quickly recovers MD5 hashes through reverse lookup. Enter a 32-character ciphertext and get the original text with one click — ideal for cryptography research and information security assessment.

Encoding & Encryption 308.7k uses

Run Python Online

Run Python code online with support for installing a rich set of third-party libraries. It includes built-in chart rendering, virtual file management, preview and download, and works instantly in a browser sandbox.

Development 288.4k uses

IP Address Lookup

A professional online IP address lookup tool offering fast, accurate global IP geolocation. It precisely shows the country, province, city and network provider associated with an IP.

Webmaster Tools 228k uses

Random Phone Number Generator

A free online random phone number generator supporting many countries and regions. Generate virtual numbers in realistic formats in bulk and export the results to Excel or TXT.

Office & Study 192.5k uses

Online Calculator

A free online calculator that works instantly in your browser with no installation. Basic mode supports add, subtract, multiply, divide, percentages and sign toggling, while scientific mode adds trigonometry, logarithms, roots, powers, factorials, absolute value and degree/radian switching, with one-click result copying.

Everyday Life 125k uses

QQ Avatar Lookup

Fetch QQ avatars, QQ Mail avatars and QQ Zone avatars online. Simply enter a QQ number to instantly display the matching avatar — no login required and available on any device.

Everyday Life 114.9k uses

Online Emoji Collection

The latest and most complete online Emoji collection, featuring thousands of common and up-to-date emojis. Browse by category or search by keyword, then copy and paste with one click.

Everyday Life 108.5k uses

QQ Number Value Evaluator

An intelligent QQ number valuation tool that analyzes number length, digit patterns, rarity and special meanings to provide market value analysis and price references.

Fun & Leisure 97k uses

Domain Whois Lookup

A free online Whois lookup tool supporting a large number of top-level domains. Quickly get the domain registrar, registration date, expiry date, DNS servers and registrant information.

Webmaster Tools 86.8k uses

Audio Size Compressor

A free, professional online audio compressor supporting many input formats with both lossy compression and lossless conversion modes. Customize bitrate, sample rate and channels, all processed locally in your browser to protect your privacy.

Audio Processing 84.8k uses

BMI Calculator

A free online BMI calculator: enter your height and weight to instantly get your body mass index. See whether you are underweight, normal, overweight or obese, plus tailored diet and exercise tips to help you manage your weight scientifically.

Everyday Life 83.1k uses

Network Port Reference

A free online network port reference listing the services and protocols of common and registered ports. Search by port number or keyword, perfect for development, operations and security troubleshooting.

Webmaster Tools 66.1k uses

Random Password Generator

An online random password generator that lets you customize length and character sets to create strong random passwords. Generate in bulk and copy with one click to strengthen your account security.

Encoding & Encryption 61k uses

QR Code Generator

A free online QR code generator: enter text or a URL to create a QR code image. Adjust the size and error correction level, then download and save it.

Image Processing 58k uses

Batch Whois Lookup

A free online batch Whois lookup tool that accepts multiple domains at once and lists each domain's registration status, registrar, registration and expiry dates line by line. It automatically distinguishes registered, unregistered, registry-reserved and unsupported domains, and results can be copied or exported to CSV.

Webmaster Tools 54k uses

Timestamp Converter

An online Unix timestamp converter that shows the current timestamp in real time and converts between timestamps and dates in both directions. Switch between seconds and milliseconds precision and pick your time zone — a must-have for development and debugging.

Webmaster Tools 52k uses

Online Unit Converter

A free online unit converter covering length, weight, area, volume, temperature, data size, time, speed and more. Get instant results as you type, swap units, and copy with one click on any phone or computer.

Everyday Life 46k uses

Income Tax Calculator

A free online income tax calculator that computes personal income tax on wages and salaries using the cumulative withholding method. It supports social insurance and housing fund deductions as well as special additional deductions, and shows your after-tax salary.

Everyday Life 44k uses

Base64 Encode & Decode

An online Base64 encoding and decoding tool that handles Chinese text and file content. Encode or restore with one click — a common utility for development and debugging.

Encoding & Encryption 41.1k uses

Special Symbols Collection

A comprehensive and efficient online special symbols collection featuring emojis, math symbols, arrows, currency signs, punctuation, numbered lists and thousands more characters. Search by keyword and copy any symbol with a single click to boost your work and social efficiency.

Everyday Life 38k uses

JSON Formatter & Validator

A free online JSON formatter and validator: beautify, minify and syntax-check JSON with one click. Choose 2/4-space or tab indentation and get error position hints — a handy tool for API debugging and data cleanup.

Development 36k uses

Age & Birthday Calculator

A free online age calculator: enter your birth date to get your exact age in years, days lived and months, plus your zodiac sign, Chinese zodiac and the days until your next birthday.

Everyday Life 31k uses

URL Encode / Decode

An online URL encoder and decoder that supports both whole-URL and single-parameter modes. Escape or restore Chinese text and special characters with one click — essential for development and API integration.

Development 29.1k uses

Random Number Generator

An online random number generator that produces random integers within a range and count you specify. It supports unique values and sorting, perfect for lucky draws, roll calls and test data.

Fun & Leisure 27k uses

Hash Generator

A free online hash generator supporting MD5, SHA-1, SHA-256, SHA-384 and SHA-512. Enter text to compute a digest instantly, switch between upper and lower case, and copy with one click — a common utility for development and data verification.

Encoding & Encryption 26k uses

Online Word Count

An online word count tool that shows characters, words, Chinese characters, lines, paragraphs and sentences in real time, and estimates reading time. A must-have before writing copy or checking a thesis.

Office & Study 25k uses

Regex Tester

An online regular expression tester with real-time match highlighting, group capture, and flags such as case-insensitive and global. See matches and their count instantly — essential for developing and debugging regex.

Development 24k uses

Color Converter

An online color converter that converts between HEX, RGB and HSL in real time, with a built-in color picker and common palette. What you see is what you get — essential for front-end theming and design color picking.

Image Processing 22k uses

UUID Generator

A free online UUID generator that creates version 4 (random) universally unique identifiers in bulk. Options include uppercase, removing hyphens and up to 100 IDs at once — a must-have for development and testing.

Development 21k uses

Cron Expression Parser

An online Cron expression parser supporting both the standard 5-field and the 6-field (with seconds) formats. It validates the expression and computes the next several run times — a must-have for operations and scheduled-task debugging.

Development 20k uses