Type what you need.

Calculate percentages

Compute exact age from birthdate

Calculate your Body Mass Index

Count characters, words, sentences, paragraphs, and more

Create QR codes as SVG from text or URLs with customizable size

Generate secure random passwords

Generate random numbers in any range

Compute the gap between two dates in years, months, weeks, and days

Add and subtract time durations in HH:MM:SS format

Calculate monthly loan payments

Calculate compound interest

Add or remove VAT from any amount

Calculate sale prices and savings

Calculate tips and split bills

Transform text between camelCase, PascalCase, snake_case

Compare two texts and highlight word-level differences

Create placeholder text in words, sentences, or paragraphs

Resize images to exact pixel dimensions or by scale percentage

Reduce JPEG file size with adjustable quality from 1 to 100

Enter any hex, RGB or HSL value and see every format conversion plus perceived brightness

Count down to zero with presets and an alert when it lands

Time something with lap splits, started and stopped from the keyboard

Work and break cycles with a round counter

Convert between 12-hour and 24-hour time formats

Daily calorie burn from height, weight, age and activity

Estimate body fat from tape measurements

Estimated due date and trimester dates from the last period

Estimate the fertile window, ovulation date and next period from the last period date and usual cycle length, using the luteal phase method

Work out how much a trip costs in fuel from the distance, consumption and fuel price

See how much interest a regular monthly overpayment saves on a repayment mortgage, and how many years it cuts off the term

Annual salary as an hourly, daily, weekly and monthly rate

What you need on the final exam to hit your target grade

Perform fraction arithmetic

Calculate display ratios, GCD

Scale ingredients up or down into amounts you can measure

Several named counters you can click up and down

Prettify and format JSON with configurable indentation

Convert text to Base64 format

Convert Base64 encoded strings back to plain text

Decode JWT tokens into header, payload, and signature

Create cryptographically random UUID version 4 identifiers

Percent-encode text using standard encodeURIComponent encoding

Decode percent-encoded (URL-encoded) strings back to readable text

Compute MD5 digests

Compute SHA-256 digests

Compute HMAC-SHA256 message authentication codes

Convert text to URL-friendly slugs

Test regular expressions with live match highlighting and position

Check JSON syntax and get detailed error information

Encode text to HTML entities

Compare two JSON objects and show added, removed, and changed fields

Format and pretty-print SQL queries with proper indentation

Format and indent JavaScript code based on brace and bracket

Prettify and indent minified CSS with proper spacing

Prettify and indent HTML

Prettify and indent XML documents

Analyze JWT tokens for expiry, format, and claims problems

Convert Unix file permissions between octal, symbolic rwx notation and a plain-English description

Create cron expressions with presets or custom fields

Calculate contrast ratio between foreground and background colors

Create essential meta tags for SEO, viewport, charset

Create og: meta tags for rich social media previews on Facebook

Create crawler directives with disallow paths, sitemap URL

Read a user agent string and report the browser, rendering engine, operating system and device type

Generate bcrypt password hashes

Analyze password security

Create RS256-signed JWT tokens with auto-generated RSA key pairs

Create time-ordered UUID version 7 identifiers

Enter CIDR notation and get network address, broadcast, subnet mask

Enter a file extension or MIME type string and get the matching

Get the meaning, category, and RFC spec for status code 429

Compute the Keccak-256 digest of text, using the original Keccak padding rather than the NIST-finalised SHA3-256, which is the version Ethereum uses for addresses, transaction hashes and function selectors