Percentage Calculator
Calculate percentages, percentage change, and ratios.
Free Online Calculators
Simple calculators and utility tools for finance, dates, text, developer, security, health, and unit conversions. No account is required.
Finance & Business
Loan Payment Calculator
Estimate monthly loan payments and total interest.
Mortgage Calculator
Estimate monthly mortgage payments and total cost.
Simple Interest Calculator
Calculate simple interest and final balance.
Compound Interest Calculator
Calculate compound growth over time.
Profit Margin Calculator
Calculate profit and gross margin percentage.
Markup Calculator
Calculate markup percentage and profit.
Discount Calculator
Calculate sale price and total savings.
Sales Tax Calculator
Calculate tax amount and final price.
Salary to Hourly Calculator
Convert annual salary and hourly pay.
Overtime Calculator
Calculate regular and overtime earnings.
Tip Calculator
Calculate tip, total bill, and cost per person.
Fuel Cost Calculator
Estimate trip fuel usage and cost.
Mileage Reimbursement Calculator
Calculate reimbursement from miles and rate.
Date & Time
Age Calculator
Calculate exact age and days until the next birthday.
Date Difference Calculator
Find the number of days between two dates.
Day Counter
Count days, weeks, and approximate months between dates.
Business Days Calculator
Count weekdays between two dates.
Health
BMI Calculator
Calculate body mass index using metric or imperial units.
Calorie Calculator
Estimate daily calorie needs from activity level.
Unit Converters
Unit Converter
Convert common distance, volume, and length units.
File Size Converter
Convert bytes, KB, MB, GB, and TB.
Celsius to Fahrenheit Converter
Convert Celsius and Fahrenheit temperatures.
Feet to Meters Converter
Convert feet and meters.
Pounds to Kilograms Converter
Convert pounds and kilograms.
Text Tools
Word Counter
Count words, characters, sentences, paragraphs, and reading time.
Character Counter
Count characters with and without spaces, words, and lines.
Case Converter
Convert text to uppercase, lowercase, title case, sentence case, or alternating case.
Remove Duplicate Lines
Remove repeated lines while preserving the original order.
Sort Lines
Sort text lines alphabetically, numerically, ascending, or descending.
Remove Extra Spaces
Clean repeated spaces, tabs, and unnecessary blank lines.
Find and Replace
Find text and replace all matching occurrences instantly.
Text Diff Checker
Compare two text blocks and display line-by-line differences.
Slug Generator
Convert a title or phrase into a clean URL-friendly slug.
HTML Tag Remover
Remove HTML tags and return readable plain text.
Email Extractor
Extract unique email addresses from pasted text.
URL Extractor
Extract unique web addresses from pasted text.
Reading Time Calculator
Estimate reading and speaking time for any text.
Lorem Ipsum Generator
Generate placeholder paragraphs, sentences, or words.
Random Name Generator
Generate random first names, last names, or full names.
Developer Tools
JSON Formatter
Format JSON with readable indentation and sorted output options.
JSON Validator
Validate JSON syntax and identify parsing errors.
JSON Minifier
Remove unnecessary whitespace from JSON data.
JSON to CSV Converter
Convert JSON arrays and objects into CSV format.
CSV to JSON Converter
Convert CSV data into structured JSON.
Base64 Encoder and Decoder
Encode text to Base64 or decode Base64 back to text.
URL Encoder and Decoder
Percent-encode or decode text for use in URLs.
JWT Decoder
Decode JWT header and payload data without verifying its signature.
UUID Generator
Generate one or more random UUID version 4 identifiers.
Unix Timestamp Converter
Convert Unix timestamps to dates or dates to Unix timestamps.
Regex Tester
Test regular expressions and inspect matching text groups.
Cron Expression Helper
Build and explain standard five-field cron expressions.
Markdown Preview
Convert common Markdown syntax into a safe HTML preview.
HTML Formatter
Format and indent HTML source for easier reading.
SQL Formatter
Format common SQL statements and clauses for readability.
Password & Security Tools
Password Generator
Generate strong random passwords with custom length and character options.
Passphrase Generator
Create memorable random passphrases from multiple words.
Password Strength Checker
Estimate password strength, entropy, and common security weaknesses.
Random Token Generator
Generate secure random hexadecimal, URL-safe, or numeric tokens.
Hash Generator
Generate SHA-256, SHA-512, SHA-1, or MD5 hashes from text.
QR Code & Barcode Tools
QR Code Generator
Create a downloadable QR code from a URL or plain text.
Wi-Fi QR Code Generator
Create a QR code that connects phones and tablets to a Wi-Fi network.
vCard QR Code Generator
Create a contact QR code with name, phone, email, and organization.
Email QR Code Generator
Create a QR code that opens a prefilled email message.
SMS QR Code Generator
Create a QR code that opens a prefilled text message.
Phone Number QR Code Generator
Create a QR code that opens the phone dialer.
WhatsApp QR Code Generator
Create a QR code that opens a WhatsApp conversation with an optional message.
Location QR Code Generator
Create a QR code for latitude and longitude coordinates.
Calendar Event QR Code Generator
Create a QR code for an iCalendar event.
Code 128 Barcode Generator
Generate a downloadable Code 128 barcode in SVG format.
EAN-13 Barcode Generator
Generate an EAN-13 product barcode from 12 or 13 digits.
UPC-A Barcode Generator
Generate a UPC-A product barcode from 11 or 12 digits.
Color & Design Tools
Color Converter
Convert colors between HEX, RGB, and HSL formats.
Color Picker
Choose a color and view its HEX, RGB, and HSL values.
Color Palette Generator
Generate harmonious color palettes from a base color.
CSS Gradient Generator
Create linear CSS gradients and copy the generated code.
Color Contrast Checker
Check WCAG contrast ratios for text and background colors.
CSS Box Shadow Generator
Build CSS box-shadow values with an instant preview.
CSS Text Shadow Generator
Create CSS text-shadow values and preview the result.
CSS Border Radius Generator
Generate CSS border-radius values for rounded shapes.
Random Color Generator
Generate random colors with HEX, RGB, and HSL values.
CSS Button Generator
Create a reusable CSS button with custom colors and spacing.
CSS Triangle Generator
Generate a pure CSS triangle in any direction.
Aspect Ratio Calculator
Calculate dimensions while preserving an image or screen aspect ratio.