All tools.

Area and perimeter of a circular annulus

Compute area and perimeter of a circle from its radius

Area, perimeter and arc length of a circular sector

Area and perimeter (Ramanujan) of an ellipse

Area and perimeter of a regular hexagon

Area and perimeter of a parallelogram

Area and perimeter of a regular pentagon

Area, perimeter and diagonal of a rectangle

Area and perimeter of any regular polygon

Area and perimeter from the two diagonals

Area, perimeter and diagonal of a square

Area and perimeter of a trapezoid

Area and perimeter using Heron's formula (three sides)

Complete ASCII reference table (0-127)

Two-way encoding and decoding

Text ↔ UTF-8 binary

Imperial and metric, with classification

Calculate Body Mass Index with WHO classification

Next/previous business day, first/last of month and is-business check

camelCase, snake_case, kebab-case, Title, UPPER

Chars, words, lines and reading time

Code point, hex, decimal, binary, UTF-8 and Unicode category

Visual + HEX, RGB, HSL, oklch

Calculate investments with compound interest and monthly contributions

Convert PNG, WEBP, HEIC, GIF and more to JPEG with custom background color

Convert images to PNG preserving transparency. Compression level is informative (no native Canvas control)

Convert images to WebP with efficient compression — lossy or lossless

Luhn-valid card numbers for Visa, Mastercard, Amex, Discover, Diners and JCB

Build cron expressions with presets and natural-language description

Reduce CSS size by removing whitespace and comments

Convert CSV to JSON array

Live FX rates

Add years, months, days, hours and minutes to a date

Calculate calendar days, business days and breakdown in years/months/days

Subtract years, months, days, hours and minutes from a date

Compare two texts and see differences by char, word or line

Employer Identification Number with valid IRS prefix

Random US-style person with name, SSN, address and contact

Generate full favicon set (.ico, PNGs, manifest) from image or text

Greatest common divisor for up to 20 positive integers

MD5, SHA-1, SHA-256, SHA-512

Text ↔ UTF-8 hexadecimal

Encode and decode HTML entities

Reduce JPEG, PNG and WebP image size in your browser — no uploads

Crop a region of an image with free or fixed aspect ratio

Resize by pixels, percent or target file size in KB

Geolocation and ISP for any public IP

Basic JavaScript minification (strips comments and whitespace)

Format, validate and minify JSON online

Convert a JSON array to CSV

Decode JWT token header and payload

Least common multiple for up to 20 positive integers

Remove or replace line breaks and normalize CRLF/LF.

Filler text by paragraphs or words

Markdown editor with live preview and XSS sanitization

Generate full HTML meta tags: SEO, Open Graph and Twitter Card

Compute the quotient and remainder of an integer division

Browser, OS and device details

IPv4, IPv6 and approximate location

OS, architecture and CPU

Convert between binary, octal, decimal and hexadecimal

Pick random numbers within a range, with or without repetition

Converts numbers to words (PT/EN) with currency support.

Count how many times a word or pattern appears in a text

Configurable length, character sets, and strength

X% of Y, increase, decrease, change

Random valid US phone numbers, optionally by state

Generate placeholder images with custom colors, pattern and text

Convert between PNG and SVG. Input SVG is sanitized for security

Decompose a number into prime factors and list its divisors

URL, text, WiFi, email, phone, SMS, vCard

Test regular expressions with flags and live match highlighting

Normalize text by stripping diacritics

Convert between RGB and HEX bidirectionally

Build robots.txt files with per-user-agent rules, sitemap and host

Convert between Arabic (1–3999) and Roman numerals

Solve direct and inverse proportions

Calculate simple interest, amount, or solve for any variable

Generate sitemap.xml from a list of URLs

Generate URL-friendly slugs from any text.

Sort text lines in ascending or descending order

Check spelling in PT/EN/ES with suggestions.

Generate fake but format-valid US Social Security Numbers

Library of special symbols, arrows, math, currency and emojis to copy.

Reverse characters, words or lines

Split text by separator or regex

Convert text into HTML with paragraphs, line breaks and auto-links

Limit text by characters, words or lines

Convert between Unix timestamp and human-readable date

Convert date/time between IANA time zones around the world

Convert plain text into decorative Unicode fonts (bold, italic, script and more).

Convert length, mass, volume, temperature, area, speed and more

Percent-encode strings

v1, v4 or v7 with bulk export

Removes and normalizes spaces, tabs and blank lines.

Look up city and state for any US ZIP code