Developer Tools 49
JSON Formatter
Online JSON formatting, minifying, and validating tool, supports multiple languages.
Random Password Generator
Online random password generator with customizable length and character sets for strong, secure passwords.
Binary to Decimal
Free online binary to decimal converter, supports large numbers for accurate results.
Decimal to Binary
Convert decimal to binary quickly, supports integers and decimals, free online tool.
Decimal to Hexadecimal
Convert decimal to hexadecimal, supports integers and decimals, free to use online.
JSON to XML
Convert JSON data to XML format, handles nested objects and arrays, free and fast for developers.
XML to JSON
Convert XML data to JSON format, supports attributes, nested elements and text content.
JSON Formatter
Free online JSON formatter, beautifies JSON with syntax highlighting and indentation.
JSON Minify
Free online JSON minifier, removes extra spaces and newlines to reduce size for faster transfer.
JSON Validator
Free online JSON validator, checks syntax and pinpoints errors for reliable data.
JSON to CSV
Free online JSON to CSV converter, flattens JSON arrays into tables for Excel and data analysis.
XML Formatter
Free online XML formatter, auto-indents and aligns for better readability.
CSS Minify
Free online CSS minifier, removes comments and extra spaces to shrink file size and speed up pages.
HTML Minify
Free online HTML minifier, removes redundant spaces and comments to speed up page loading.
SQL Format
Free online SQL formatter, auto-indents and beautifies queries, supports multiple database dialects.
YAML to JSON
Free online YAML to JSON converter, paste or upload YAML and convert with one click, preserving data structure.
Regex Tester
Online regex tester supporting JavaScript and PCRE syntax, highlights matches with replace and group capture.
UUID Generator
Free online UUID generator supporting v1/v4, batch generation and one-click copy for developers.
Password Strength Check
Free online password strength checker, analyzes security in real time with scores and improvement tips.
HTTP Status Code Lookup
HTTP status code reference, quickly look up meanings, use cases and common causes for developers.
Text Processing 51
Character Counter
Online tool to count characters, Chinese characters, words, lines and bytes with real-time statistics.
Case Converter
Online case converter: ALL CAPS, all lowercase, capitalizing first letters, and title case.
Text to Uppercase
Free online text-to-uppercase tool, converts lowercase to uppercase with one click, supports mixed Chinese and English.
Text Deduplicator
Free online text deduplication tool, removes duplicate lines while keeping the first occurrence.
Text Sorter
Free online text sorter, sorts lines alphabetically or numerically in ascending or descending order.
Text Reversal
Free online text reverser, reverses line order or individual characters with one click.
Capitalize First Letter
Free online capitalize tool, converts the first letter of each word to uppercase with batch support.
Text Statistics
Free online text statistics tool, counts words, characters, paragraphs and lines in real time.
Space Cleaner
Free online whitespace cleaner, removes extra spaces, leading/trailing spaces and empty lines.
Newline Converter
Free online newline converter, converts line endings between Windows, Unix and Mac formats.
Text Truncator
Free online text truncator, cuts text by characters or words while keeping whole words intact.
Remove HTML Tags
Free online HTML tag remover, strips all tags and keeps plain text with batch support.
HTML to Text
Free online HTML to text converter, keeps line breaks and paragraphs for easy reading.
Number to Chinese Uppercase
Free online Chinese number converter, outputs RMB uppercase amounts for invoices and contracts.
RMB Amount Uppercase
Free online RMB uppercase converter, converts lowercase numbers to standard Chinese uppercase.
Underscore to CamelCase
Online snake_case to camelCase converter with batch processing to boost coding efficiency.
CamelCase to Underscore
Online camelCase to snake_case converter with batch support for consistent code style.
Random String Generation
Free online random string generator, customize length and character sets for passwords and test data.
Random Email Generator
Random email generator provides temporary addresses to protect your real inbox from spam.
Repeated Text Generator
Repeat text generator quickly creates repeated content for testing, placeholders and practice.
Encoding Conversion 12
URL Encode/Decode
Online URL encode/decode tool supporting encodeURIComponent/decodeURIComponent, one-click conversion.
Base64 Encode
Free online Base64 encoder supporting Chinese characters, converts text to Base64 right in your browser.
Hex Encoding/Decoding
Free online hexadecimal encoder/decoder, converts between text and HEX quickly and accurately.
ASCII Code Conversion
Convert between characters and ASCII codes with one click, supports common and extended ASCII.
Morse Code Conversion
Online Morse code converter, converts text to Morse code and back, with audio playback.
Base64 Encoder/Decoder
Online Base64 encoder/decoder supporting text and files, fast and secure conversion.
HTML Entity Encoder/Decoder
Online HTML entity encoder/decoder, converts special characters to entities to prevent XSS.
Unicode Encoder/Decoder
Online Unicode encoder/decoder, converts characters to \u escape sequences or back to readable text.
Base32 Encode/Decode
Free online Base32 encoding and decoding tool, supports standard Base32 character set, quickly convert text.
Text-Binary Converter
Free online tool to convert text to binary strings or restore binary strings to text, supporting UTF-8.
Vigenère Cipher
Encrypt and decrypt text using the Vigenère cipher algorithm with custom keys, free to use online.
ROT13 Cipher Converter
Free online ROT13 tool, one-click ROT13 conversion of text, often used to hide text.
Hashing 11
MD5 Encryption
Free online MD5 hash generator, converts text to 32-character MD5 with uppercase/lowercase output.
SHA1 Encryption
Free online SHA1 generator, creates 40-character SHA1 hashes for digital signatures and file checks.
SHA256 Encryption
Free online SHA256 generator, produces secure 64-character hashes for blockchain and data integrity.
SHA512 Encrypt
Free online SHA512 Encrypt. Runs entirely in your browser, no data uploaded, ready to use.
CRC32 Checksum
Free online CRC32 Checksum. Runs entirely in your browser, no data uploaded, ready to use.
HMAC Calculator
Free online HMAC Calculator. Runs entirely in your browser, no data uploaded, ready to use.
All-in-One Hash Calculator
Free online All-in-One Hash Calculator. Runs entirely in your browser, no data uploaded, ready to use.
File MD5 Checker
Free online File MD5 Checker. Runs entirely in your browser, no data uploaded, ready to use.
AES Encryption/Decryption
Free online AES encryption/decryption tool, supporting multiple modes (CBC, ECB, CFB, OFB) and padding methods, with customizable keys.
RSA Encryption/Decryption
Free online RSA encryption/decryption tool, supporting public key encryption, private key decryption, and key generation.
Hash Comparison Tool
Free online hash comparison tool, supports MD5, SHA1, SHA256, SHA512 and other algorithms, quickly verify text or file hashes.
Calculators 18
Online Calculator
Free online calculator with basic arithmetic, percentage and square root for daily use.
BMI Calculator
Use our free BMI calculator to quickly compute your body mass index and assess your health.
Percentage Calculator
Use our percentage calculator to quickly compute percentages, discounts and rate changes.
Discount Calculator
Use the discount calculator to see the final price and money saved for smarter shopping.
Mortgage Calculator
Use the mortgage calculator to estimate monthly payments and plan your home budget.
Interest Calculator
Free online interest calculator supporting simple and compound interest for loans or deposits.
Fuel Consumption Calculator
Free online fuel consumption calculator, enters fuel cost, price and distance to compute consumption per 100km.
Body Fat Calculator
Free online Body Fat Calculator. Runs entirely in your browser, no data uploaded, ready to use.
BMR Calculator
Free online BMR Calculator. Runs entirely in your browser, no data uploaded, ready to use.
Income Tax Calculator
Free online Income Tax Calculator. Runs entirely in your browser, no data uploaded, ready to use.
Electricity Bill Calculator
Enter electricity usage and price to quickly calculate the electricity bill. Supports tiered pricing (peak/off-peak), and provides two modes: calculate by usage and reverse-calculate by cost, helping you manage your electricity costs.
Running Pace Calculator
Enter running distance and time to calculate pace (time per kilometer) and speed (km/h). Supports multiple units to help runners plan training and races.
Duration Calculator
Enter the start and end times to calculate the duration (days, hours, minutes, seconds) between them. Supports mixed date and time input, simple to operate.
Car Loan Calculator
Enter the loan amount, annual interest rate, and term to calculate monthly payment and total interest. Supports both equal principal and equal installment methods to help you plan your car purchase budget.
Tip Calculator
Enter the bill amount and tip percentage to calculate the tip amount, total amount, and per person share. Supports splitting evenly by number of people, quick and accurate.
Provident Fund Loan Calculation
Enter loan amount, annual interest rate, and term to calculate monthly repayment and total interest for provident fund loans. Supports equal principal and interest and equal principal, helping you plan your home purchase.
Standard Weight Calculation
Enter height and weight to calculate BMI and standard weight range, providing health advice. Supports multiple formulas to help you understand your weight status.
Return on Investment (ROI) Calculator
Free online Return on Investment (ROI) calculator. Enter investment cost and return amount to quickly calculate ROI percentage and net profit, helping evaluate investment performance.
Math Tools 24
Fraction Calculator
Free fraction calculator supporting add, subtract, multiply and divide with automatic reduction.
Prime Check
Free online prime number checker, instantly tells if a number is prime with factorization.
Greatest Common Divisor
Free online GCD calculator, computes the greatest common divisor of two or more integers.
Least Common Multiple
Free online LCM calculator, computes the least common multiple with support for large numbers.
Factorial Calculator
Free online factorial calculator, computes n! for any non-negative integer, supports large numbers.
Fibonacci Sequence
Free online Fibonacci generator, produces the first N terms with support for large numbers.
Random Number Generator
Free online random number generator, customize min and max to generate one or more random integers.
Dice Roller
Simulate dice rolls online, supports d4, d6, d8, d10, d12, d20 with custom quantities.
Ratio Calculator
Use our online ratio calculator to solve unknown values in ratios, supports fractions and integers.
Square Calculator
Use our online square calculator to compute the square of any number instantly.
Average Calculator
Use our online average calculator to compute the mean of any set of numbers.
Trigonometry Calculator
Free online Trigonometry Calculator. Runs entirely in your browser, no data uploaded, ready to use.
Logarithm Calculator
Free online Logarithm Calculator. Runs entirely in your browser, no data uploaded, ready to use.
Quadratic Equation Solver
Free online Quadratic Equation Solver. Runs entirely in your browser, no data uploaded, ready to use.
Prime Number List Generator
Free online Prime Number List Generator. Runs entirely in your browser, no data uploaded, ready to use.
Exponentiation Calculator
Free online power calculator supporting integer, decimal, and negative exponents, quickly calculating any number raised to a power.
Root Calculator
Free online root calculator that supports any root. Enter the radicand and index to get instant results.
Permutation and Combination Calculator
Free online permutation and combination calculator. Enter total n and selection k to quickly calculate permutations P(n,k) and combinations C(n,k).
Prime Factorization
Free online prime factorization tool. Enter a positive integer to quickly get its prime factorization.
Roman Numeral Conversion
Free online Roman numeral converter, supports Arabic to Roman and Roman to Arabic, two-way conversion.
Unit Converters 20
Temperature Conversion
Free online temperature converter, converts between Celsius, Fahrenheit and Kelvin accurately.
Length Unit Conversion
Free online length converter, converts between meters, centimeters, inches, feet, yards and more.
Weight Unit Conversion
Free online weight converter, converts between kg, g, lb, oz and jin accurately.
Area Unit Conversion
Free online area converter, converts between square meters, hectares, mu, square feet and more.
Volume Unit Conversion
Free online volume converter, converts between liters, milliliters, cubic meters and more.
Speed Unit Conversion
Free online speed converter, converts between m/s, km/h, mph and knots.
Data Storage Unit Conversion
Free online data storage converter, converts between bit, byte, KB, MB, GB, TB with binary and decimal standards.
Exchange Rate Converter
Free online Exchange Rate Converter. Runs entirely in your browser, no data uploaded, ready to use.
Pressure Unit Converter
Free online Pressure Unit Converter. Runs entirely in your browser, no data uploaded, ready to use.
Power Unit Converter
Free online Power Unit Converter. Runs entirely in your browser, no data uploaded, ready to use.
Energy Unit Converter
Free online Energy Unit Converter. Runs entirely in your browser, no data uploaded, ready to use.
Angle Unit Converter
Free online Angle Unit Converter. Runs entirely in your browser, no data uploaded, ready to use.
Shoe Size Converter
Free online Shoe Size Converter. Runs entirely in your browser, no data uploaded, ready to use.
Frequency Unit Converter
Free online frequency unit converter, supporting conversion between common frequency units such as Hertz (Hz), kilohertz (kHz), megahertz (MHz), gigahertz (GHz), etc. Enter the value and unit to get results quickly.
Force Unit Converter
Free online force unit converter, supports conversion between common force units such as Newton (N), kilogram-force (kgf), pound-force (lbf), etc. Enter value and unit to get results quickly.
Density Unit Converter
Free online density unit converter, supports conversion between common density units such as kg/m³, g/cm³, g/mL, etc. Enter a value and unit to get results quickly.
Torque Unit Converter
Free online torque unit converter, supporting conversion between common torque units such as Newton-meter (N·m), kilogram-force meter (kgf·m), pound-foot (lb·ft), etc. Input the value and unit to quickly get the result.
Flow Rate Unit Converter
Free online flow unit converter, supports conversion between common flow units such as liters per minute (L/min), cubic meters per hour (m³/h), gallons per minute (GPM), etc. Enter values and units to get results quickly.
Clothing Size Converter
Free online clothing size converter, supporting conversion of common size systems such as international (XS/S/M/L/XL), US, EU, etc. Enter a value to get the corresponding size.
Paper Size Converter
Free online paper size converter, supports conversion of international standard paper sizes including A, B, C series. Input a size to get the equivalent sizes in other series.
Date & Time 15
Timestamp Converter
Online timestamp converter between Unix timestamps and date-time, supports seconds/milliseconds and shows the current timestamp in real time.
Age Calculator
Enter your birth date to instantly calculate your exact age in years, months and days.
Date Difference in Days
Enter two dates to instantly calculate the number of days between them, supports multiple formats.
Date Addition and Subtraction
Add or subtract days, weeks, months or years from a date and get the result instantly.
Time Unit Conversion
Free online time unit converter, converts between seconds, minutes, hours, days, weeks, months and years.
Batch Timestamp Converter
Free online Batch Timestamp Converter. Runs entirely in your browser, no data uploaded, ready to use.
World Timezone Converter
Free online World Timezone Converter. Runs entirely in your browser, no data uploaded, ready to use.
Countdown Timer
Free online Countdown Timer. Runs entirely in your browser, no data uploaded, ready to use.
Online Stopwatch
Free online Online Stopwatch. Runs entirely in your browser, no data uploaded, ready to use.
Zodiac & Constellation Query
Free online Zodiac & Constellation Query. Runs entirely in your browser, no data uploaded, ready to use.
Working Day Calculator
Free online business day calculator to quickly calculate the number of business days between two dates, with support for excluding weekends and custom holidays. Easy to use, calculate now.
Millisecond Timestamp Converter
Free millisecond timestamp converter, supports bidirectional conversion between millisecond timestamps and date-time, accurate to the millisecond. Enter a timestamp or date for instant conversion.
Day of Week Calculator
Free online weekday calculator. Enter a date to quickly know the day of the week. Supports multiple date formats, simple and convenient.
Date Week Number Calculator
Free online week number calculator. Enter a date to get its week number in the year (ISO 8601 standard), with support for custom start week.
Date Formatting Tool
Free online date formatting tool, supports multiple common formats, customizable format, input date or timestamp, instant formatted output.
AI Tools 23
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AI Article Rewriting
Free online AI article rewriting tool. Input original text for one-click unique rewriting while preserving meaning and avoiding duplication. Supports Chinese polishing and SEO rewriting.
AI Long Article Summarizer
Free online AI long article summarizer. Extract key points, generate summaries and title suggestions with one click, and quickly grasp the content of long articles.
AI Title Generator
Free online AI title generator. Enter a topic to generate 10 high-click Chinese titles with one click, balancing keywords and appeal, ideal for self-media and SEO.
AI Keyword Expander
Free online AI keyword expansion tool: enter a core word to generate 30 Chinese long-tail keywords in one click, covering question/scenario/regional dimensions, to help with SEO keyword selection.
AI Code Explainer
Free online AI code explainer. Paste code in any programming language, and AI will output a feature overview, step-by-step explanation of core logic, and key point tips. A great helper for learning and debugging.
AI SQL Generator
Free online AI SQL generator, describe query requirements in natural language, AI automatically generates executable MySQL statements with explanations, improving development efficiency.
AI Regex Generator
Free online AI regex generator. Describe matching requirements in natural language, AI generates accurate regex with explanations and matching examples.
AI Weekly Report Generator
Free online AI weekly report generator. Input this week's work content, and AI will automatically organize it into a professional weekly report including completed tasks, data highlights, risks and issues, and next week's plans.
AI Long-form Generator
Free online AI long-form generator. Input keywords to generate 800-1200 word SEO original articles in one click, including title and section structure, suitable for site owners to quickly produce content.
AI TDK Generator
Free online AI TDK generator. Enter keywords to generate SEO titles, descriptions, and keywords in one click to optimize indexing and CTR. A must-have for webmasters.
AI FAQ Generator
Free online AI FAQ generator, one-click generation of 8 frequently asked questions and answers around keywords, beneficial for Baidu inclusion and aggregation, improving page SEO value.
AI Batch Rewriter
Free online AI batch rewriting tool. Paste multiple articles at once, AI rewrites them individually to preserve meaning and avoid similarity, greatly improving content production efficiency.
Xiaohongshu Copy
Free online Xiaohongshu copy generator. Enter a topic to generate viral recommendation posts in one click: includes title, body, and hashtags. Suitable for bloggers and brand operators.
Short Video Script
Free online short video script generator. Enter a topic to generate a 40-60 second spoken script with opening hook, main content, closing CTA, and shot suggestions.
Product Selling Point Extractor
Free online product selling point extractor tool. Enter product information to instantly generate 5 core selling points and a tagline, highlighting customer benefits and boosting conversion rates.
Customer Service Reply Generator
Free online customer service reply generator: input negative reviews or user feedback, AI generates sincere and professional reply scripts: first empathize, provide solutions, and leave room for follow-up.
Excel Formula Generator
Free online Excel formula generator - describe needs in Chinese, AI auto-generates usable Excel formulas with function explanations, a true office efficiency booster.
PPT Outline Generator
Free online PPT outline generator. Enter a topic to instantly generate a complete outline including cover + content pages + end page, with title and bullet points for each slide, for efficient framework building.
Email & Document Generator
Free online email/document generator. Input key points to instantly generate formal emails or documents: including subject, salutation, body, and signature, with professional and appropriate tone.
English Essay Polisher
Free online English essay polishing tool. Paste your English essay, AI polishes the full text, provides a 10-point score, key issues, and improvement suggestions. Essential for English learning.
