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Unit converters, calculators, generators, and developer utilities. Fast and free.

🔎

🔥 Popular

Image Resize Tool

Image Format Converter

JSON Formatter & Validator

XML / SOAP Formatter

Base64 Encoder / Decoder

Kilograms to Pounds

Celsius to Fahrenheit

All tools

92 tools

📅 Date

4 tools

Calculate exact age in years, months, and days from date of birth.

Days Between Dates Calculator

Find the exact number of days and weeks between two dates.

Date Add / Subtract Calculator

Add or subtract days, weeks, months, or years from any date.

Time Zone Converter

Convert time between major global time zones for meetings and scheduling.

💸 Finance

5 tools

Bill Splitter Calculator

Split a bill with tax and tip across any number of people.

Calculate tip amount, total bill, and per-person cost instantly.

Fuel Cost Calculator

Estimate road trip fuel usage and total fuel cost from distance and fuel economy.

Electricity Bill Calculator

Estimate electricity usage and cost from watts, usage hours, and utility rate.

Retirement Calculator

Project your retirement savings with monthly contributions and compound returns.

🖼️ Images

11 tools

Image Resize Tool

Resize PNG, JPEG, or WebP images in your browser.

Image Format Converter

Convert images between PNG, JPEG, and WebP formats.

Image Crop Tool

Crop images by setting X, Y, width, and height values.

Image to Base64 Converter

Convert images to Base64 data URLs for HTML, CSS, JSON, and API embedding.

SVG to PNG Converter

Convert SVG files to PNG with custom output dimensions directly in your browser.

Image Color Picker

Click any pixel in an image to get exact HEX and RGB color values.

Favicon Generator

Generate favicon PNGs in multiple required sizes for browsers and devices.

Image Metadata Viewer

Inspect image file metadata and EXIF details like camera model, date, and dimensions.

Image Color Extractor

Extract dominant colors from any image to build palettes for branding and UI design.

Placeholder Image Generator

Generate custom placeholder images with exact dimensions for prototyping and layout testing.

Aspect Ratio Cropper

Crop images to social-ready ratios like 1:1, 16:9, 4:5, and 9:16 without guesswork.

💻 Developer

10 tools

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 strings back to plain text.

URL Encoder / Decoder

Encode special characters for URLs or decode percent-encoded strings.

JSON Formatter & Validator

Pretty-print, minify, and validate JSON data instantly.

XML / SOAP Formatter

Format, minify, and validate XML and SOAP payloads.

Format, minify, and validate YAML files.

Properties / INI Formatter

Normalize key-value description formats like .properties and INI-style files.

Generate SHA-256, SHA-1, and SHA-512 hashes from any text input.

Test regular expressions against text with live match highlighting.

Text Diff Checker

Compare two blocks of text and highlight additions, deletions, and changes line by line.

Unix Timestamp Converter

Convert Unix timestamps to readable dates and convert dates back to timestamps.

🎲 Generators

4 tools

Generate RFC 4122 compliant UUIDs (v4) instantly. Bulk generation supported.

Password Generator

Generate strong, cryptographically random passwords with configurable length and character sets.

Lorem Ipsum Generator

Generate placeholder text by paragraphs, sentences, or words.

QR Code Generator

Generate QR codes for URLs, text, email, or phone numbers - download as PNG.

📝 Text

13 tools

Word & Character Counter

Count words, characters, sentences, paragraphs, and estimated reading time.

Text Case Converter

Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and kebab-case.

Markdown Previewer

Write Markdown on the left, see the rendered HTML preview on the right in real time.

Remove Duplicate Lines

Deduplicate repeated lines while preserving the first occurrence order.

Sort Lines Alphabetically

Sort text lines A–Z or Z–A instantly.

Remove Extra Spaces

Clean double spaces, leading/trailing spaces, and irregular whitespace.

CSV to JSON Converter

Convert CSV rows into JSON objects for APIs and development workflows.

JSON to CSV Converter

Convert JSON arrays or objects into CSV format for spreadsheet tools.

Email Extractor

Extract email addresses from messy text blocks instantly.

Number Extractor

Extract all numeric values from text, logs, invoices, or scraped content.

Convert titles and phrases into clean URL-friendly slugs.

String Length Counter

Count characters, UTF-8 bytes, and words for any input string.

Count Occurrences

Count how many times a word, phrase, or character appears in text.

💪 Health

13 tools

Sleep Calculator

Find recommended bedtimes or wake times based on 90-minute sleep cycles.

Ovulation Calculator

Estimate your fertile window and ovulation day from your last period and cycle length.

Pregnancy Due Date Calculator

Estimate your due date and current pregnancy week from your last menstrual period.

Water Intake Calculator

Estimate your daily water needs based on body weight, activity, and climate.

Protein Calculator

Calculate your daily protein target in grams based on body weight and fitness goal.

One Rep Max (1RM) Calculator

Estimate your one-rep max from weight and reps using the Epley formula.

Running Pace Calculator

Convert distance and finish time into pace per kilometer and per mile.

Heart Rate Zones Calculator

Calculate 5 cardio training zones from your estimated max heart rate.

Body Fat Percentage Calculator

Estimate body fat percentage using the U.S. Navy measurement formula.

Macro Calculator (IIFYM)

Calculate daily protein, carbs, and fat targets from calories, body weight, and goal.

Calculate your Body Mass Index and see what it means for your health.

Calorie Calculator

Calculate your daily calorie needs based on your body and activity level.

Ideal Weight Calculator

Find your ideal body weight range based on height.

🧮 Math

11 tools

Percentage Calculator

Calculate percentages, percentage change, and percentage of a number.

Roman Numeral Converter

Convert numbers to Roman numerals and Roman numerals back to numbers.

Number to Words Converter

Spell out numbers in English words for cheques, invoices, and legal documents.

Scientific Notation Converter

Convert decimal numbers to scientific notation and scientific notation to plain decimal.

Fraction Simplifier

Reduce fractions to lowest terms instantly.

Ratio Calculator

Scale ratios and find proportional values quickly.

Average Calculator

Compute mean, median, mode, and range from a list of numbers.

Standard Deviation Calculator

Calculate population and sample standard deviation from a number list.

Prime Number Checker

Check whether a number is prime and list useful divisor info.

LCM & GCD Calculator

Find least common multiple (LCM) and greatest common divisor (GCD) of two numbers.

Binary / Hex / Octal Converter

Convert values between binary, octal, decimal, and hexadecimal bases.

⚖️ Weight

3 tools

Kilograms to Pounds

Convert kilograms (kg) to pounds (lb) instantly.

Pounds to Kilograms

Convert pounds (lb) to kilograms (kg) instantly.

Kilograms to Ounces

Convert kilograms (kg) to ounces (oz) quickly.

📏 Length

6 tools

Centimeters to Inches

Convert centimeters (cm) to inches instantly.

Inches to Centimeters

Convert inches to centimeters (cm) instantly.

Convert meters (m) to feet (ft) instantly.

Convert feet (ft) to meters (m) instantly.

Miles to Kilometers

Convert miles (mi) to kilometers (km) instantly.

Kilometers to Miles

Convert kilometers (km) to miles (mi) instantly.

🌡️ Temperature

3 tools

Celsius to Fahrenheit

Convert Celsius (C) to Fahrenheit (F) instantly.

Fahrenheit to Celsius

Convert Fahrenheit (F) to Celsius (C) instantly.

Celsius to Kelvin

Convert Celsius (C) to Kelvin (K) instantly.

🚀 Speed

2 tools

Convert miles per hour (mph) to kilometers per hour (km/h) instantly.

Convert kilometers per hour (km/h) to miles per hour (mph) instantly.

🎨 Design

7 tools

HEX to RGB Converter

Convert HEX color codes to RGB values with live preview.

RGB to HEX Converter

Convert RGB color values to HEX color codes with live preview.

Color Palette Generator

Generate tints, shades, and complementary colors from any HEX color.

CSS Unit Converter

Convert between px, rem, em, vw, and pt - with configurable base font size.

Color Contrast Checker

Check WCAG contrast ratio between foreground and background colors.

CSS Gradient Generator

Create linear gradients and copy ready-to-use CSS code.

Random Color Generator

Generate random colors with HEX, RGB, and HSL values. Lock colors you like.