Percentage calculator

Calculate percentages, find percentage changes, and solve percentage problems.

Percentage change calculator

Calculate the percentage increase or decrease between two values. Perfect for tracking growth, price changes, or performance metrics.

Percent off calculator

Calculate discounts and savings. Find out how much you'll save and the final price after a percentage discount.

Tip percentage calculator

Calculate tip amounts, total bill, and split the cost between multiple people. Perfect for restaurants and services.

Test grade calculator

Calculate your test grade percentage and letter grade. Simply enter points earned and points possible.

Reverse percentage calculator

Find the original amount when you know a percentage and the result. Useful for finding original prices after discounts or working backwards.

Add/Subtract percentage calculator

Quickly add or subtract a percentage from a value. Perfect for adding tax, applying markups, or making quick adjustments.

Compound percentage calculator

Calculate the result after multiple percentage changes applied sequentially. Ideal for tracking cumulative changes over time.

BMI calculator

Calculate Body Mass Index from height and weight. Determine your BMI to assess health and fitness levels.

Unit converter

Convert between units of length, weight, temperature, volume, and more. Transform measurements to different unit systems.

Length converter

Convert between units of length including meters, kilometers, inches, feet, yards, miles, and more.

Weight converter

Convert between units of weight including kilograms, grams, pounds, ounces, tons, and more.

Temperature converter

Convert between Celsius, Fahrenheit, and Kelvin temperature scales.

Volume converter

Convert between units of volume including liters, milliliters, gallons, quarts, pints, cups, and more.

Loan calculator

Calculate loan payments, total interest, and amortization schedule. Perfect for personal loans, auto loans, and mortgages.

Calorie calculator

Calculate your daily calorie needs based on BMR and activity level. Perfect for weight management and fitness goals.

Base64 Encoder/Decoder

Encode and decode Base64 strings. Essential for API development and data encoding.

CSV to JSON converter

Convert between CSV and JSON formats. Transform spreadsheet data into structured JSON or vice versa.

JSON to CSV converter

Convert JSON data to CSV format. Transform structured data into spreadsheet-compatible CSV format.

JSON to YAML converter

Convert between JSON and YAML formats. Transform structured JSON into human-readable YAML or vice versa.

YAML to JSON converter

Convert YAML data to JSON format. Transform YAML configuration files into structured JSON for applications.

HTML to Markdown converter

Convert between HTML and Markdown formats. Transform HTML documents into clean Markdown or convert Markdown to HTML for web pages.

Markdown to HTML converter

Convert Markdown to HTML format. Transform Markdown documents into HTML for web pages and applications.

Color converter

Convert between HEX, RGB, HSL, and other color formats. Pick colors and convert them to different formats.

JSON linter

Validate and format JSON data. Paste your JSON and get properly formatted output.

URL Encoder/Decoder

Encode and decode URL components. Critical for web development and handling special characters in URLs.

Regex visualizer

Test, visualize, and understand regular expressions with real-time matching, highlighting, and detailed explanations.

Regex tester

Test and validate regular expressions with live matching. Perfect for debugging and learning regex patterns.

UUID generator (v4 - Random)

Generate, validate, parse, and convert UUIDs. Support for v1, v3, v4, v5, v6, v7, and utility functions.

UUID generator (v1 - Timestamp)

Generate timestamp-based UUIDs (v1). Includes MAC address and timestamp information for time-ordered identifiers.

UUID generator (v3 - Namespace MD5)

Generate deterministic UUIDs (v3) using MD5 hashing. Same name and namespace always produce the same UUID.

UUID generator (v5 - Namespace SHA-1)

Generate deterministic UUIDs (v5) using SHA-1 hashing. Same name and namespace always produce the same UUID.

UUID generator (v6 - Reordered Timestamp)

Generate reordered timestamp UUIDs (v6) with improved database indexing performance. Compatible with v1.

UUID generator (v7 - Unix Epoch)

Generate Unix epoch timestamp UUIDs (v7) with monotonic ordering guarantees. Ideal for database primary keys.

UUID validator

Validate UUID format and detect version. Check if a string is a valid UUID and identify its version (v1-v7).

UUID parser

Parse UUID strings into byte arrays. Convert UUID strings to their 16-byte binary representation.

UUID converter

Convert between UUID v1 and v6 formats. Transform timestamp-based UUIDs between different ordering schemes.

JWT decoder

Decode and inspect JWT tokens. Essential for debugging authentication tokens and understanding token structure.

Diff checker

Compare two texts and find the differences. Perfect for code, documents, or any text comparison.

HTTP Status codes

Browse and search HTTP status codes. Complete reference with descriptions, categories, RFC specifications, and links to MDN documentation.

HTML Entities

Browse and search HTML entities. Find character codes, numeric references, and hex codes for special characters.

CSS Colors

Browse and search CSS named colors. Find hex codes, RGB, and HSL values for all CSS color names.

QR Code generator

Generate QR codes from text or URLs. Create scannable codes for sharing links, contact info, and more.

WiFi QR Code generator

Generate QR codes for WiFi networks. Create scannable codes that allow devices to automatically connect to your WiFi network.

Password generator

Generate passwords with customizable options. Create strong, random passwords for accounts and services.

Random number generator

Generate random numbers within a specified range. Customize minimum, maximum, and count of numbers to generate.

Text case converter

Convert between camelCase, snake_case, kebab-case, PascalCase, and more. Transform text to different naming conventions.

Camel case converter

Convert text to 'camelCase'. Transform text to 'camelCase' naming convention.

Pascal case converter

Convert text to 'PascalCase'. Transform text to 'PascalCase' naming convention.

Snake case converter

Convert text to 'snake_case'. Transform text to 'snake_case' naming convention.

Kebab case converter

Convert text to 'kebab-case'. Transform text to 'kebab-case' naming convention.

Upper case converter

Convert text to 'UPPER CASE'. Transform text to ' PPER_CASE' naming convention.

Lowercase converter

Convert text to 'lower case'. Transform text to 'lower case' naming convention.

Title case converter

Convert text to 'Title Case'. Transform text to 'Title Case' naming convention.

Sentence case converter

Convert text to 'Sentence case'. Transform text to 'Sentence case' naming convention.

Word counter

Count words, characters, sentences, and paragraphs in text. Perfect for writers, students, and content creators.

Lorem ipsum generator

Generate placeholder text for design and development. Create dummy content for mockups and prototypes.

Character counter

Count characters for social media posts. Track your character count against platform limits.

Twitter character counter

Count characters for Twitter posts. Track your character count against Twitter's 280 character limit.

Instagram character counter

Count characters for Instagram posts. Track your character count against Instagram's 2,200 character limit.

Facebook character counter

Count characters for Facebook posts. Track your character count against Facebook's 63,206 character limit.

LinkedIn character counter

Count characters for LinkedIn posts. Track your character count against LinkedIn's 3,000 character limit.

TikTok character counter

Count characters for TikTok captions. Track your character count against TikTok's 150 character limit.

Custom character counter

Count characters with a custom limit. Track your character count against a 1,000 character limit.

Multi URL opener

Open multiple URLs at once in new tabs. Perfect for batch browsing or checking multiple links.

List sorter

Sort lists alphabetically or numerically. Paste your list and get it sorted instantly.

List operations

Perform set operations on lists. Calculate union, intersection, and difference between two lists.

Remove duplicates

Remove duplicate items from a list. Paste your list and get a clean version with only unique items.

Shuffle list

Randomize the order of items in a list. Perfect for creating random sequences or shuffling data.

Random decision maker

Can't decide? Let this tool randomly pick an option for you. Perfect for making choices when you're stuck.

Date calculator

Calculate age, time since, time until, and date differences. Get detailed breakdowns in years, months, and days.

How long ago?

Calculate how much time has passed since a specific date.

How long until?

Calculate how much time remains until a future date.

Date difference

Calculate the difference between two dates.

CRON scheduler

Build and validate CRON expressions. Create schedules for tasks and automation.

Visual CRON builder

Create CRON expressions using a visual interface with common scheduling options.

CRON validator

Validate CRON expressions and see when they will run next.

Pomodoro timer

Boost your productivity with the Pomodoro Technique. Work in focused 25-minute sessions with breaks.

Timezone converter

Compare times across different timezones. Use the slider to see what time it will be around the world.

Workout timer

Create and track custom workouts. Build your exercise routine with timed intervals and rest periods.

7-Minute Workout

High-intensity circuit training workout. 12 exercises, 30 seconds each with 10-second rest periods.