Free Online Tools
141 Free Browser-Based Tools
No sign-up, no installation, no data sent to servers. Every tool runs entirely in your browser.
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Developer Tools
26Token CounterEstimate GPT-4/Claude API tokens and cost before you send a request
JSON FormatterFormat, minify and validate JSON — syntax errors highlighted instantly
Base64 EncoderEncode and decode Base64 strings with full Unicode support
UUID GeneratorBulk-generate UUID v4 identifiers — copy all or download as .txt
JSON to CSVConvert JSON arrays to CSV spreadsheets in one click
Timestamp ConverterConvert Unix timestamps to readable dates and back instantly
HTML FormatterIndent and beautify HTML markup with syntax highlighting
HTML EncoderEncode and decode HTML entities — prevent XSS, display code safely
URL EncoderEncode and decode URLs and query strings with RFC 3986 compliance
JWT DecoderDecode JSON Web Tokens and inspect header, payload and signature
Regex TesterTest regular expressions live with match highlighting and group capture
Color ConverterConvert between HEX, RGB, HSL and CMYK colour formats
Base ConverterConvert numbers between binary, octal, decimal and hexadecimal
CSS MinifierMinify CSS by removing whitespace, comments and redundant rules
Char MapBrowse and copy special characters, symbols and Unicode glyphs
Binary / TextConvert text to binary digits and decode binary back to text
SQL FormatterFormat and beautify SQL queries with syntax highlighting
XML FormatterFormat, validate and minify XML with error highlighting
YAML ↔ JSON ConverterConvert between YAML and JSON formats instantly
Cron Expression BuilderBuild and explain cron expressions visually with next run times
Hash GeneratorGenerate MD5, SHA-1, SHA-256 and SHA-512 hashes from text
CSS Gradient GeneratorGenerate CSS background gradients with preview and code output
Flexbox PlaygroundExperiment with all CSS flexbox properties with live visual preview
CSS Grid GeneratorBuild CSS grid layouts visually and get the code instantly
Git Commit Message GeneratorGenerate conventional git commit messages from a description
Markdown Table GeneratorBuild and edit Markdown tables with a visual grid editor
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Text Tools
22Word CounterCount words, characters, sentences, paragraphs and reading time instantly
Case ConverterConvert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case and more
Readability ScoreAnalyse text readability with Flesch-Kincaid and Gunning Fog index scores
AI Prompt GeneratorBuild high-quality prompts for ChatGPT, Claude, Midjourney and more
Markdown PreviewWrite Markdown and see the rendered HTML preview side by side
Lorem Ipsum GeneratorGenerate Latin placeholder text in words, sentences or paragraphs
Text Diff CheckerCompare two texts and highlight additions, deletions and changes
Find & ReplaceFind and replace text with plain text or regex support
Slug GeneratorConvert any title to an SEO-friendly URL slug instantly
Text ReverserReverse words, characters or lines in any text
Line SorterSort lines alphabetically, numerically or randomly — deduplicate too
Duplicate RemoverRemove duplicate lines from any text while preserving order
Word FrequencyCount word occurrences in any text and sort by frequency
Character CounterCount characters with and without spaces, by type breakdown
Reading Time CalculatorEstimate reading time for any text with WPM speed settings
Random Text GeneratorGenerate random sentences, paragraphs or custom vocabulary text
Text to UnicodeConvert text to Unicode code points and back
Emoji FinderSearch and copy any emoji by name, keyword or category
Text StatisticsDeep text analysis: vocabulary richness, sentence length, density
camelCase / snake_case ConverterConvert between camelCase, snake_case, kebab-case and PascalCase
Pig Latin ConverterConvert English text to Pig Latin and back with the proper rules
Letter Frequency AnalyzerAnalyze letter frequency distribution in any text
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Utility Tools
5QR Code GeneratorConvert any URL or text to a scannable QR code image
Morse Code TranslatorConvert text to Morse code dots and dashes and decode back
Unit ConverterConvert length, weight, temperature, volume and more between units
Age CalculatorCalculate exact age in years, months and days with birthday countdown
Roman NumeralsConvert between Arabic numbers and Roman numerals instantly
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Security Tools
9Password GeneratorGenerate strong random passwords with custom length and character sets
Password Strength CheckerCheck password strength with detailed scoring and improvement tips
Random Token GeneratorGenerate cryptographically secure random tokens and API keys
Caesar CipherEncrypt and decrypt text using the Caesar cipher shift
Vigenère CipherEncrypt and decrypt text with the Vigenère polyalphabetic cipher
Base32 Encoder / DecoderEncode and decode text in Base32 format (RFC 4648)
Hex ↔ Text ConverterConvert text to hexadecimal and back in multiple formats
ROT13 EncoderApply ROT13 and other rotation ciphers to any text
Hash IdentifierIdentify the type of a hash string (MD5, SHA-1, SHA-256, bcrypt, etc.)
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Math & Numbers
16Percentage CalculatorX% of Y, percentage change, what % is X of Y — all in one
Scientific CalculatorFull scientific calculator with trig, log, factorial and powers
Fraction CalculatorAdd, subtract, multiply and divide fractions with step-by-step results
Prime Number CheckerCheck if a number is prime and find the nearest primes
Fibonacci GeneratorGenerate Fibonacci sequence up to N terms or a target number
Random Number GeneratorGenerate random numbers with custom range, count and no-repeat option
GCD & LCM CalculatorFind GCD and LCM for two or more numbers instantly
Statistics CalculatorCalculate mean, median, mode, standard deviation and more
Prime FactorizationFactor any number into its prime components with visual tree
Number to WordsConvert any number to its English and Chinese word form
BMI CalculatorCalculate Body Mass Index with weight status and healthy range
Loan CalculatorCalculate monthly payments, total interest and amortization schedule
Compound Interest CalculatorCalculate compound interest growth with yearly breakdown chart
Quadratic Equation SolverSolve ax² + bx + c = 0 with step-by-step working
Percentage DifferenceCalculate percentage difference, increase or decrease between two values
Modulo CalculatorCalculate remainder, quotient and check divisibility
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Finance Tools
12Tip CalculatorCalculate tip amount and split the bill evenly per person
Currency ConverterConvert between 30+ major currencies with live-like rates
VAT CalculatorAdd or remove VAT/GST from any amount for 40+ countries
Discount CalculatorCalculate sale price, discount amount and savings percentage
ROI CalculatorCalculate return on investment, annualized ROI and break-even
Savings Goal CalculatorFind out how long to reach your savings goal with interest
Break-Even CalculatorCalculate break-even point in units and revenue for your business
Meeting Cost CalculatorCalculate the real cost of meetings by attendees and hourly rate
Income Tax CalculatorEstimate income tax with bracket-by-bracket breakdown
Investment Returns CalculatorCompare lump sum vs DCA investment strategies over time
Budget PlannerPlan your monthly budget with income, expenses and savings tracking
DCA CalculatorDollar-cost averaging future value with monthly compounding
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Date & Time
12Date CalculatorAdd or subtract days, weeks, months, years from any date
Time Zone ConverterConvert time between any two time zones instantly
Unix Timestamp ConverterConvert between Unix timestamps and human-readable dates
Date Difference CalculatorCalculate the exact difference between two dates in multiple units
Countdown TimerCount down to any future date with days, hours, minutes display
World ClockView current time in multiple cities around the world simultaneously
Calendar GeneratorGenerate a printable monthly calendar for any month and year
Week Number CalculatorFind the ISO week number for any date and list all weeks in a year
Day of Week CalculatorFind what day of the week any date falls on
Time Duration CalculatorAdd, subtract and convert time durations in HH:MM:SS format
Business Days CalculatorCalculate working days between dates excluding weekends and holidays
Leap Year CheckerCheck if a year is a leap year and list upcoming leap years
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Color & Design
10Color Palette GeneratorGenerate harmonious color palettes from any base color
Contrast CheckerCheck WCAG color contrast ratio for accessibility compliance
Random Color GeneratorGenerate random colors with HEX, RGB and HSL codes
CSS Gradient GeneratorBuild custom CSS linear and radial gradients visually
Tailwind Color ReferenceBrowse all Tailwind CSS color palette shades with hex codes
Material Design ColorsBrowse Google Material Design color palette with copy on click
Image Color ExtractorExtract dominant colors from any uploaded image
Color Name FinderFind the closest named color for any HEX or RGB value
CSS Box Shadow GeneratorBuild CSS box-shadow with live visual preview and code output
Font Size ConverterConvert between px, rem, em, pt and viewport units
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Network & Web
10IP Address LookupLook up your IP address and geolocation information
URL ParserParse any URL into its components: protocol, host, path, query, hash
HTTP Headers ReferenceBrowse all common HTTP request and response headers with descriptions
MIME Types ReferenceLook up MIME types for any file extension or content type
Port Numbers ReferenceLook up well-known TCP/UDP port numbers and their services
User Agent ParserParse any browser user agent string into readable browser and OS info
HTML Entity ReferenceBrowse all HTML entities with character, code and description
robots.txt GeneratorBuild a robots.txt file visually with common rules and sitemap
XML Sitemap GeneratorGenerate a simple XML sitemap from a list of URLs
HTTP Status CodesBrowse all HTTP status codes with descriptions and use cases
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Media Tools
9Image to Base64Convert uploaded images to Base64 data URI strings instantly
Aspect RatioFind aspect ratio from dimensions or calculate missing side
Image Resize CalculatorCalculate new image dimensions while maintaining aspect ratio
SVG OptimizerMinify and clean SVG code by removing unnecessary attributes
ASCII Art GeneratorConvert text to ASCII art using classic figlet-style fonts
Image Metadata ViewerView EXIF and metadata from uploaded JPEG, PNG and WebP images
Video Resolution CalculatorCalculate video file size and bitrate for common resolutions
Icon FinderSearch and copy Unicode symbols, arrows, math and special characters
Placeholder Image URL GeneratorGenerate placeholder image URLs for web development mockups
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Health & Science
9Calorie CalculatorCalculate daily calorie needs (TDEE) based on age, weight and activity
Body Fat CalculatorEstimate body fat percentage using multiple measurement methods
Water Intake CalculatorCalculate daily water intake recommendation based on weight and activity
Ideal Weight CalculatorCalculate ideal body weight using multiple medical formulas
Heart Rate Zone CalculatorCalculate exercise heart rate zones by age and resting heart rate
Sleep CalculatorFind the best bedtime or wake-up time based on sleep cycles
Ohm's Law CalculatorCalculate voltage, current, resistance and power using Ohm's Law
Resistor Color CodeDecode resistor color bands to find resistance value and tolerance
Speed Distance Time CalculatorSolve any speed, distance or time problem instantly