All Free Online Tools

JSON Formatter & Validator

Format, validate, and minify JSON data instantly.

Base64 Encoder & Decoder

Encode text to Base64, or decode Base64 back to plain text. Supports full UTF-8.

UUID v4 Generator

Generate random UUIDs (v4) in bulk with one click.

URL Encoder & Decoder

Encode or decode URL components and query strings.

JSON to CSV Converter

Convert JSON arrays to CSV format with one click. Supports nested objects.

Random Wheel Spinner

Spin the wheel to pick random winners from your list. Three modes, CSV import, history tracking.

CSV to JSON Converter

Convert CSV files or pasted data to JSON arrays. Auto-detects headers and types.

Random Number & Dice

Generate random numbers, flip a coin, or roll dice — all in one place.

Random List Picker

Paste a list of items and pick random winners instantly. Also works as a list randomizer and shuffler.

Hash Generator

Generate MD5, SHA-1, and SHA-256 hashes from any text using your browser's built-in crypto.

Nickname Generator

Generate random nicknames, gamer tags, and fantasy names instantly.

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and back. Auto-detects seconds vs milliseconds.

Cron Expression Generator

Build cron schedule strings visually and get a plain-English explanation of when they run.

Age Calculator

Calculate your exact age in years, months, and days — plus total seconds lived for fun.

Work Day Calculator

Add working days to a start date (skipping weekends) to find a project deadline.

Life Progress Bar

Visualize how much of this year — and your life — has already passed with animated progress bars.

Pomodoro Timer

Browser-based 25/5 Pomodoro timer that shows the countdown in the browser tab title.

Online Stopwatch

Online stopwatch with millisecond precision and lap times — plus a built-in countdown timer with quick presets and audio alarm.

Favicon Generator

Create favicons from images, text, or emoji. Generate multiple sizes with live preview.

Case Converter

Convert text between 7 case styles: sentence, lower, UPPER, Title, Capitalized, aLtErNaTiNg, InVeRsE.

Text Cleaner

Remove duplicate lines, extra whitespace, line breaks, and unwanted characters with 7 cleaning modes.

Text Transformer

Reverse text, repeat N times, sort lines alphabetically, and find/replace with 4 transformation modes.

Text Analyzer

Count words, characters, sentences, find duplicates, and analyze word frequency with detailed statistics.

Online Notepad

Simple browser-based notepad with auto-save, download to .txt, and customizable font settings.

Phonetic Translator

Translate text to NATO alphabet, Pig Latin, or phonetic spelling with 3 conversion modes.

Plain Text Converter

Convert HTML to plain text, strip Markdown syntax, or extract text from RTF with 3 conversion modes.

Word Cloud Generator

Generate beautiful word clouds from text with customizable colors, sizes, and layouts.

Roman Numeral Converter

Convert between numbers and Roman numerals (I, V, X, L, C, D, M) with validation and date formatting.

Freelance Hourly Rate Calculator

Calculate your minimum freelance hourly rate, day rate, and weekly retainer based on income goals, expenses, and the true cost of unbillable hours.

Compound Interest Calculator

Calculate compound interest growth with monthly contributions. Interactive year-by-year chart with inflation-adjusted mode.

PayPal & Stripe Fee Calculator

Calculate PayPal and Stripe transaction fees. Enter the amount you want to receive and get the exact amount to charge.

Color Palette Generator

Generate harmonious 5-color palettes with WCAG accessibility contrast checking and one-click CSS/Tailwind export.

Aspect Ratio Calculator

Calculate pixel dimensions for any aspect ratio. Social media presets for YouTube, TikTok, Instagram, and more.

Image Resizer & Compressor

Resize and compress images using HTML5 Canvas. Set width, height, quality, or target file size. 100% browser-based — your images are never uploaded.

QR Code Generator

Generate QR codes from URLs, text, or email. Download as PNG.

Password Generator

Generate secure passwords with crypto.getRandomValues(). Length slider, character sets, entropy strength meter.

Percentage Calculator

Calculate percentages: X% of Y, what percent X is of Y, and percentage change.

BMI & BMR Calculator

Calculate BMI, BMR, and daily calorie needs with metric/imperial support.

Temperature Converter

Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine in real time.

Color Picker

Pick colors and convert between HEX, RGB, HSL, CMYK. Check WCAG contrast ratios.

Lorem Ipsum Generator

Generate lorem ipsum placeholder text by paragraphs, sentences, or words.

Tip Calculator

Calculate tips, split bills, and find per-person amounts with custom tip percentages.

Regex Tester

Test regular expressions in real-time with match highlighting and capture group display.

JWT Decoder

Decode and inspect JSON Web Tokens — view header, payload, and expiry status instantly.

Markdown Preview

Live Markdown editor with split-pane preview, GFM support, and HTML export.

Password Strength Checker

Check how strong your password is with realistic crack-time estimates and improvement suggestions.

Morse Code Converter

Translate text to Morse code and decode Morse to English instantly.

KM to Miles Converter

Convert kilometers to miles and miles to km with a simple calculator.

MM to Inches Converter

Convert millimeters to inches and inches to mm with precision.

Text Reverser — Reverse Text, Words & Strings for Backwards Text

Reverse text characters, words, or lines instantly online.

Random String Generator

Generate random strings with custom length and character sets.

GPA Calculator

Calculate your cumulative GPA on a 4.0 scale with grades and credits.

Paycheck Calculator

Calculate your net take-home pay from hourly or salary income with federal tax and deductions.

Loan Calculator

Calculate monthly loan payments and view a full amortization schedule with principal and interest breakdown.

Sales Tax Calculator

Add or remove sales tax for any US state. Pre-loaded with all 50 state tax rates.

Barcode Generator

Generate Code 128 barcodes from any text and download as SVG. No sign-up required.

Random Number Generator

Generate cryptographically random numbers in any range — dice, lottery, statistics, or any custom min/max.

Random Word Generator

Generate random English words filtered by type (noun/verb/adjective/adverb), length, and starting letter.

Username Generator

Generate creative usernames for gaming, social media, or professional profiles in 5 styles.

Date Difference Calculator

Calculate the exact difference between two dates in years, months, days, weeks, hours, and working days.

Number to Words Converter

Convert numbers to English words in cardinal, ordinal, or check-writing format up to quadrillions.

Reading Time Calculator

Estimate reading time, word count, speaking time, and text statistics by pasting any content.

LBS to KG Converter

Convert pounds to kilograms and back instantly. See results in kg, oz, and stones with a quick-reference table.

KG to LBS Converter

Convert kilograms to pounds and back instantly. See 141.3 kg to lbs, results in lbs, oz, and stones with a quick-reference table.

Hours Calculator

Calculate hours between two times, add or subtract hours from a time, and track weekly work hours with pay calculation.

Calorie Deficit Calculator

Calculate your daily calorie deficit for weight loss using the Mifflin-St Jeor formula. Get your BMR, TDEE, and timeline to reach your goal weight.

Car Payment Calculator

Calculate your monthly car payment with APR, down payment, trade-in, taxes, and fees. Includes amortization table and total cost breakdown.

Fraction Calculator

Add, subtract, multiply, and divide fractions with step-by-step solutions. Supports mixed numbers. Shows work for students.

Margin Calculator

Calculate gross profit margin, markup percentage, and revenue needed. Includes break-even calculator and industry margin benchmarks.

Hex to RGB Color Converter

Convert hex color codes to RGB and HSL values instantly. Includes color picker, CSS variable output, and example colors.

Discount Calculator

Calculate sale price, discount percentage, or original price. Add sales tax, quantity, and see a discount comparison table.

Sleep Calculator

Find the best time to sleep or wake up based on 90-minute sleep cycles. Uses sleep science to show optimal bedtimes and wake times.

Word Counter

Count words, characters, sentences, and paragraphs in real time. Shows reading time, speaking time, keyword density, and content length benchmarks.

Investment Calculator

Calculate investment growth with compound interest and monthly contributions. Shows year-by-year breakdown and total returns.

Retirement Calculator

Calculate how much you need to retire using the 4% rule. See if you are on track and how contributions affect your retirement date.

TDEE Calculator

Calculate your Total Daily Energy Expenditure (TDEE) and BMR using the Mifflin-St Jeor equation. Get calorie targets for weight loss, maintenance, or gain.

Ovulation Calculator

Calculate your ovulation date and fertile window based on your last period and average cycle length. Shows 3 future cycle forecasts with visual timeline.

Body Fat Calculator

Estimate body fat percentage using the US Navy circumference method. Shows healthy ranges by gender, ACE classification, and comparison to BMI.

Income Tax Calculator

Estimate your 2025 federal income tax based on taxable income, filing status, and deductions. Shows marginal vs. effective tax rate and FICA breakdown.

Invoice Generator

Create professional invoices with itemized line items, discounts, taxes, and auto-save. Print as PDF or copy as plain text. Stores data in browser.

ROI Calculator

Calculate simple and annualized ROI (CAGR) with S&P 500 benchmark comparison. Includes profit/loss display and 3 example presets.

JavaScript Minifier

Minify JavaScript by removing whitespace, comments, and unnecessary characters. Shows original vs. minified size and reduction percentage.

Budget Calculator

Budget your income using the 50/30/20 rule. See recommended allocations for needs, wants, and savings. Includes custom split override.

Cooking Converter

Convert between cooking measurements: oz to ml, cups to grams, teaspoons, tablespoons, pints, and liters. Includes ingredient density selector for accurate cup-to-gram conversion.

Speed Converter

Convert between speed units: knots, mph, km/h, meters per second, and feet per second. Includes Beaufort wind scale reference and common speed benchmarks.

Area Converter

Convert between area units: square feet, square meters, acres, hectares, square yards, square miles, and square kilometers. Includes real estate size reference table.

Liquid Volume Converter

Convert between liquid volume units: US/UK gallons, liters, fluid ounces, cups, pints, and quarts. Clearly distinguishes between US and Imperial measurements.

Heart Rate Zone Calculator

Calculate your 5 heart rate training zones based on age and resting heart rate. Supports both the standard percentage method and the Karvonen formula.

Net Worth Calculator

Calculate your net worth by entering assets and liabilities across multiple categories. Includes age-based net worth benchmarks for context.

Protein Calculator

Calculate your daily protein needs based on body weight, activity level, and fitness goal (muscle gain, fat loss, or maintenance). Includes meal planning guidance.

Running Pace Calculator

Calculate running pace, finish time, or distance from any two inputs. Supports min/km and min/mile. Includes race split projections for 5K through marathon.

CSS Grid Generator

Build CSS grid layouts visually. Configure columns, rows, gap, and alignment properties with live preview. Copy generated CSS and HTML for any grid layout.

Number Base Converter

Convert numbers between binary, decimal, octal, and hexadecimal. Includes two's complement representation and ASCII character mapping for developer reference.

Dividend Calculator

Calculate dividend yield, annual income, and DRIP compound growth.

Prorated Rent Calculator

Calculate prorated rent for move-in or move-out dates instantly.

Image to PDF Converter

Convert images to PDF instantly — drag and drop, reorder pages, and download.

PDF Merger

Merge multiple PDF files into one — reorder pages, no upload required.

Mortgage Calculator

Calculate monthly mortgage payments with PITI (principal, interest, taxes, insurance, PMI) and full amortization schedule.

Emoji Copy & Paste

Browse, search, and copy any emoji with one click. Organized by category with search.

SVG to PNG Converter

Convert SVG vector graphics to crisp PNG images at any resolution — private, browser-based, and free.

JPG to PNG Converter

Convert any image format to PNG instantly — lossless, private, and browser-based.

Debt Payoff Calculator

Choose avalanche or snowball method to pay off debt faster. Shows payoff schedule.

PNG Compressor

Reduce PNG file size with adjustable quality compression. Batch support, no upload required.

Text Diff

Compare two texts and instantly see added, removed, and unchanged lines with color-coded diff output.

Miles to KM Converter

Convert miles to kilometers and kilometers to miles with a simple calculator.

CM to Inches Converter

Convert centimeters to inches and inches to centimeters instantly.

Random Name Picker

Pick random names from a list for raffles, giveaways, and contests.

Inches to CM Converter

Convert inches to centimeters and centimeters to inches instantly.

Celsius to Fahrenheit Converter

Convert Celsius to Fahrenheit and Fahrenheit to Celsius instantly.

PNG to JPG Converter

Convert PNG images to JPG with adjustable quality. Runs entirely in your browser.

Feet to Meters Converter

Convert feet to meters and meters to feet with fractional feet+inches display.

Fahrenheit to Celsius Converter

Convert Fahrenheit to Celsius and Celsius to Fahrenheit instantly.

Meters to Feet Converter

Convert meters to feet and feet to meters with fractional feet+inches display.

Inches to Millimeters Converter

Convert inches to millimeters and millimeters to inches with fractional inch display.

Cups to Tablespoons Converter

Convert cups to tablespoons and tablespoons to cups with fractional display.

Tablespoons to Cups Converter

Convert tablespoons to cups and cups to tablespoons with fractional display.

Cups to Teaspoons Converter

Convert cups to teaspoons and teaspoons to cups with fractional display.

Teaspoons to Cups Converter

Convert teaspoons to cups and cups to teaspoons with fractional display.

Gallons to Liters Converter

Convert US gallons to liters and liters to US gallons with exact NIST factor.

Liters to Gallons Converter

Convert liters to US gallons and gallons to liters with exact NIST factor.

Lowercase to UPPERCASE Converter

Convert any text from lowercase to UPPERCASE instantly in your browser.

UPPERCASE to lowercase Converter

Convert any text from UPPERCASE to lowercase instantly in your browser.

PDF Splitter

Split a PDF into multiple files — by page ranges, equal chunks, or extract individual pages. No upload, no sign-up, no watermarks.

PDF Compressor

Compress a PDF to reduce file size — pick from three compression levels and download the smaller file. No upload, no sign-up, no watermarks.