All tools
38 tools across 6 categories. Filter, browse by category, or jump through the A–Z index.
Electronics 8
Resistors, Ohm's law, LEDs and wiring
Battery Life CalculatorEstimates how long a battery will last given its capacity and a device's consumption.
Ceramic Capacitor DecoderDecode three-digit ceramic capacitor codes to find capacitance values in picoFarads, nanoFarads, and microFarads.
LED Series Resistor CalculatorCalculate the required series resistor value and power rating for LEDs based on source voltage, forward voltage, and current.
Ohms Law CalculatorCalculates the relationship between voltage (V), current (I), resistance (R), and power (P) in a circuit.
Parallel Resistor CalculatorCalculate the equivalent resistance of multiple resistors in parallel.
Resistor Color Code CalculatorRead a 4, 5 or 6 band resistor's value from its color bands, or type a value to see which colors it uses.
Voltage Divider CalculatorCalculate output voltage from a voltage divider circuit using two resistors, or solve for resistor values.
Wire Gauge (AWG) Conversion CalculatorConvert between wire gauge (AWG) and diameter in inches and millimeters.
Developer 11
Encode, convert, generate and compare
Base64 Encoder DecoderEncode text to Base64 or decode Base64 strings back to readable text. Used for email attachments, HTML embedding, and data transmission.
Cron Expression GeneratorBuild cron expressions visually using dropdowns for minute, hour, day, month, and weekday. Get the exact cron string you need for your crontab file.
Image to Base64Convert image files to Base64 strings for embedding directly into CSS or JSON payloads. Avoid external HTTP requests.
JSON MinifierRemove all whitespace and formatting from JSON to create compact, single-line strings for improved API transmission speeds.
Markdown to HTML ConverterConvert Markdown syntax to clean, valid HTML tags instantly. Perfect for blog posts, email templates, or any HTML output needs.
Number Base ConverterConvert numbers between binary, octal, decimal and hexadecimal as you type, with bit-level detail.
Secure Password GeneratorGenerate strong, random passwords with customizable length and character types for enhanced security.
Split View Text Diff CheckerCompare two versions of text side-by-side with visual highlighting. See exactly what was removed (red) and what was added (green).
String Hash GeneratorGenerate multiple hash values (MD5, SHA-1, SHA-256, SHA-384, SHA-512, Base64) from any text input.
Unix Timestamp ConverterConvert between Unix timestamps (seconds since 1970) and human-readable dates. Essential for debugging database entries or API responses.
UUID GeneratorGenerate Version 4 UUIDs instantly in your browser. Perfect for mocking data or seeding databases.
Design 6
Color, layout and CSS helpers
Aspect Ratio CalculatorCalculate and simplify aspect ratios from width and height dimensions, essential for photography and design.
Contrast Ratio CheckerCalculate the contrast ratio between background and foreground colors according to WCAG standards. Ensure your designs are accessible and compliant.
CSS Box Shadow GeneratorVisually create CSS box-shadows with sliders for position, blur, and spread. Get instant visual feedback and copy the generated CSS code.
Golden Ratio CalculatorCalculate dimensions using the Golden Ratio (1.618) for balanced layouts, typography, and logos. Create harmonious, aesthetically pleasing designs.
Hex to RGB Color ConverterConvert between hexadecimal and RGB color codes with real-time color preview for design and development.
Lorem Ipsum GeneratorGenerate placeholder text for design mockups. Create as much filler text as you need to focus on layout without getting stuck on content.
Money 4
Loans, savings, tips and currency
Compound Interest CalculatorCalculate the future value of an investment with compound interest.
Currency ConverterConvert between different currencies using real-time exchange rates from a reliable API.
Mortgage Payment CalculatorCalculate your monthly mortgage payment based on the principal (loan amount), interest rate, and term length of the loan.
Tip CalculatorCalculate tip amounts and split bills evenly among your group. Quick and fair way to settle the check without the math headache.
Text & Math 3
Reformat, count and check
Case ConverterConvert text between uppercase, lowercase, Title Case, camelCase, and snake_case. Handle all text formatting tasks with a single click.
Prime Number CheckerCheck if a number is prime and see its factors if composite. Essential for math homework and cryptographic applications.
Vowel CounterCount vowels and consonants in any text in real-time. Useful for linguistics, cryptography, or analyzing letter distribution.
Everyday 6
Bikes, music, maps and more
Bicycle Chain Length CalculatorCalculate the correct chain length for your bicycle based on chainstay length, chainring size, and cog size.
BMX Racing Gear CalculatorA simplified BMX gear calculator tool that instantly computes gear inches or roll-out distance based on chainring, cog size, and tire selection.
BPM TapperTap along to the rhythm of a song to calculate its BPM. Perfect for DJs, producers, or music enthusiasts.
QR Code GeneratorGenerate QR codes instantly from any text or URL. Download as PNG for sharing and printing.
Tire Pressure ConverterConvert tire pressure between PSI, Bar, and kPa units for optimal vehicle handling and performance.
World Sunrise Sunset MapClick on a world map to see sunrise and sunset times for the upcoming week at any location.