72+ free tools across 11 categories

Tools that do one job, fast.

Calculators, converters, and utilities — no signup, no upload, no waiting. Everything runs in your browser.

Math Tools

Percentage Calculator

X% of Y, percent-of, and percentage change.

Average Calculator

Calculate the mean, median, minimum, maximum, and sum of a list of numbers.

Open category →

Finance Tools

Loan / EMI Calculator

Calculate the monthly payment (EMI), total interest, and total repayment for any loan amount, rate, and term.

Compound Interest Calculator

Calculate compound interest growth with principal, rate, time, and compounding frequency.

Discount Calculator

Calculate the final price after a percentage discount and how much you save.

Tip Calculator

Calculate the tip and per-person total for any bill, tip percentage, and party size.

Open category →

Health & Fitness Tools

BMI Calculator

Calculate your BMI from height and weight, with WHO category.

Calorie Calculator (BMR & TDEE)

Estimate your BMR and daily calorie needs (TDEE) from age, sex, height, weight, and activity level using the Mifflin-St Jeor equation.

Open category →

Unit Converters

Length Converter

All common length units with a live full table.

Weight Converter

All common weight units with a live full table.

Volume Converter

All common volume units with a live full table.

Area Converter

All common area units with a live full table.

Speed Converter

All common speed units with a live full table.

Time Converter

All common time units with a live full table.

All 32 unit converters →

Date & Time Tools

Timestamp Converter

Unix epoch to readable dates and back.

Date Difference

Days, weeks, months, years between dates.

Age Calculator

Calculate exact age in years, months, and days from a date of birth, plus total days lived and next birthday countdown.

Open category →

Developer Tools

$ format --json

JSON Formatter & Validator

Pretty-print, minify, and validate JSON with clear errors.

Base64 Encoder / Decoder

Text to and from Base64 with full UTF-8 support.

Regex Tester

Live match highlighting with flags and capture groups.

UUID Generator

Cryptographically random v4 UUIDs, singly or in bulk.

JWT Decoder

Inspect token headers, payloads, and expiry safely.

Hash Generator

SHA-1 through SHA-512 digests as you type.

All 17 developer tools →

Text Tools

Word Counter

Words, characters, sentences, and reading time.

Text Diff Checker

Line-by-line comparison, additions and deletions highlighted.

Sort & Dedupe Lines

Remove duplicates, sort, and trim whitespace.

Text Cleaner

Fix PDF pastes: collapse spaces, unwrap lines.

Lorem Ipsum Generator

Placeholder paragraphs, sentences, or words.

Open category →

Web & SEO Tools

IP Address Lookup

Location, ISP, and network details of any IP.

Slug Generator

Titles to clean URL slugs, accents handled.

QR Code Generator

QR codes from text or URLs, saved as PNG.

Open category →

Security Tools

Password Generator

Strong random passwords with entropy readout.

Open category →

Education Tools

GPA Calculator

Calculate your GPA on a 4.

Open category →

Fun & Random

Random Number Generator

Secure random picks from any range.

Dice Roller

Roll one or more virtual dice (d4, d6, d8, d10, d12, d20) with a cryptographically fair random source.

Open category →

Why these tools run in your browser

Most online utilities send your data to a server. Everything here runs locally in your browser with plain JavaScript — your numbers, text, and tokens never leave your machine (the only exception is the IP lookup, which necessarily queries a geolocation API).

Growing weekly

New calculators and converters are added regularly across every category. Missing something? The About page has contact details for suggestions.