No tools match your search. Try another term.
datetime · 5
Add Days to Date
Add or subtract any number of days to a date. Handles month rollovers and leap years automatically. Instant, private, in your browser.
Age Calculator
Find your exact age in years, months and days from your date of birth. Instant, private — runs entirely in your browser.
Date Difference Calculator
Calculate how many days, weeks, months and years between two dates. Works instantly in your browser — no server, no data sent.
Time Zone Converter
Convert a UTC datetime to any IANA timezone (America/New_York, Europe/London, Asia/Tokyo…). Uses your browser's built-in Intl engine — no data sent anywhere.
Work Hours Calculator
Calculate total worked hours between a start and end time, with optional break deduction. Handles night shifts (crossing midnight). Private, instant, in your browser.
math · 5
Aspect Ratio Calculator
Simplify width and height into an aspect ratio.
GCD Calculator
Find the greatest common divisor of two numbers.
LCM Calculator
Find the Least Common Multiple of two numbers. Essential for fractions, scheduling and number theory. Instant, in your browser.
Percent Change Calculator
Calculate the percentage increase or decrease between two numbers.
Percentage Calculator
Find X percent of a number.
encoders · 3
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 back to text. UTF-8 safe, 100% in your browser.
SHA Hash Generator
Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text. Computed in your browser with the Web Crypto API.
URL Encoder / Decoder
Percent-encode text for safe use in URLs, or decode an encoded URL component. Instant, private.
health · 4
BMI Calculator
Calculate your Body Mass Index from weight and height.
BMR Calculator
Estimate your Basal Metabolic Rate (Mifflin-St Jeor, male).
BMR Calculator for Women
Estimate your Basal Metabolic Rate using the Mifflin-St Jeor equation for women. Calories your body burns at complete rest — the foundation for any diet plan.
Water Intake Calculator
Estimate how much water to drink per day from your weight.
text tools · 5
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case and more. Instant, in your browser.
Line Tools
Sort lines A→Z, remove duplicate lines, reverse order, or fix spacing. Instant, in your browser.
Slug Generator
Turn any title into a clean URL slug. Strips accents and punctuation, lowercases, and joins with hyphens — all in your browser.
Word & Character Counter
Count words, characters, sentences, lines, paragraphs and estimate reading time as you type. Live, private, in your browser.
Text Diff Checker
Compare two blocks of text line by line and see additions and removals. 100% in your browser.
converters · 7
Celsius to Fahrenheit Converter
Convert Celsius to Fahrenheit and Fahrenheit to Celsius instantly. Also supports Kelvin. Exact formulas, no rounding surprises, runs in your browser.
Color Converter
Convert colors between HEX, RGB and HSL instantly. Paste a value and get every format — in your browser.
Kg to Lbs Converter
Convert kilograms to pounds and pounds to kilograms. Uses the exact conversion (1 lb = 0.45359237 kg). Perfect for fitness tracking, recipes and international shipping.
Km to Miles Converter
Convert kilometers to miles and miles to kilometers instantly. Uses the exact conversion factor (1 mile = 1.609344 km). Runs in your browser.
Meters to Feet Converter
Convert meters to feet and feet to meters. Uses the exact value (1 m = 3.280839895 ft). Runs in your browser — no data sent.
Number Base Converter
Convert integers between decimal, binary, octal and hexadecimal. Instant, private, in your browser.
Unit Converter
Convert temperature, length and weight between common units. Instant and private, in your browser.
color · 8
HEX ↔ CMYK Converter
Convert HEX colors to CMYK (Cyan, Magenta, Yellow, Key/Black) and back. Useful for print design and prepress. Device-independent approximation, instant in your browser.
Color Blindness Simulator
See how a color appears to someone with protanopia, deuteranopia, tritanopia or achromatopsia. Based on the Brettel–Viénot–Mollon (1997) model. Runs entirely in your browser.
Color Mixer
Mix two colors at any ratio using physically accurate linear-light blending. Get the resulting HEX and RGB. Private, instant, in your browser.
Color Palette Generator
Generate perceptually balanced color palettes using scientifically accurate OKLCH harmonies. Complementary, analogous, triadic — driven by CIE color science.
Color Tints & Shades
Lighten, darken or saturate any color using perceptually uniform OKLCH adjustments. Great for design systems and UI theming. Private, in your browser.
HEX ↔ HSL Converter
Convert HEX color codes to HSL (Hue, Saturation, Lightness) and back. Essential for CSS theming. Instant, private, runs in your browser.
OKLCH Color Converter
Convert HEX colors to OKLCH (Björn Ottosson 2020) and back. OKLCH is the state-of-the-art perceptual color space — native in CSS Color Level 4. Zero-dependency, runs in your browser.
WCAG Contrast Checker
Check text-to-background contrast ratio against WCAG 2.2 AA/AAA standards. Accessibility compliance in your browser.
random · 5
Coin Flip
Flip a virtual coin — heads or tails. Fair and instant.
Dice Roller
Roll a virtual die. Fair and instant, in your browser.
Random Animal Generator
Get a random animal name. Fun for games, teaching and prompts. Instant, in your browser.
Random Letter Generator
Generate a random letter from A to Z. Cryptographically fair, in your browser.
Random Number Generator
Generate a random number between any two values. Cryptographically fair, in your browser.
finance · 5
Compound Interest Calculator
See how an investment grows with annual compound interest.
Discount Calculator
Find the final price after a percentage discount.
Loan Payment Calculator
Estimate the monthly payment on a loan.
Tip Calculator
Calculate the tip and total to pay on a bill. Instant, in your browser.
VAT / Sales Tax Calculator
Add VAT or sales tax to an amount.
dev tools · 6
CSV to JSON Converter
Convert CSV (with quoted fields) into JSON, pretty JSON, or transpose rows and columns. In your browser, nothing uploaded.
File Hash Checker
Compute the SHA-256, SHA-1 or SHA-512 checksum of any file to verify its integrity. The file never leaves your browser.
JSON Formatter & Validator
Format, minify, validate, sort keys, or convert JSON to CSV. Real parsing in your browser — nothing uploaded.
JWT Decoder
Decode a JSON Web Token to see its header and payload. Runs entirely in your browser — your token is never sent anywhere. Decode only (no signature verification).
Markdown to HTML
Convert Markdown into clean HTML — headings, bold, italics, code and links. In your browser.
Unix Timestamp Converter
Convert Unix timestamps to ISO 8601 dates and back. Supports seconds and milliseconds. Runs in your browser.
image tools · 3
Image Compressor
Compress JPG, PNG and WebP images to shrink file size. Pick a quality level — everything happens in your browser, nothing uploaded.
Image Converter
Convert images between WebP, JPG and PNG. Drop in any image and download the new format — all in your browser.
Image Resizer
Resize an image to a maximum width while keeping its aspect ratio. Fast, private, in your browser — no upload.
pdf tools · 2
generators · 4
Lorem Ipsum Generator
Generate placeholder Lorem Ipsum text for designs and mockups. Click to generate.
Password Generator
Generate strong, cryptographically random passwords. Never sent anywhere — created in your browser.
QR Code Generator
Generate a QR code from any text or URL, choose the error-correction level, and download it as SVG. Everything happens in your browser.
UUID Generator
Generate RFC 4122 version 4 UUIDs (GUIDs) instantly. Cryptographically random, in your browser.