Free web tools that just work

A growing collection of fast, privacy-first calculators, converters, and generators. No sign-up, no uploads — everything runs right in your browser.

🔒 100% private ⚡ Instant 🆓 Always free 📱 Any device

Finance

Mortgage, loan, interest, and everyday money math.

Mortgage Calculator

Estimate your monthly mortgage payment from loan amount, interest rate, and term.

Loan Calculator

Calculate the monthly payment, total interest, and payoff cost for any fixed-rate loan.

Compound Interest Calculator

See how savings or investments grow over time with compound interest and regular contributions.

Percentage Calculator

Work out percentages, percentage change, and "what percent of" in one place.

Tip Calculator

Calculate the tip and split the bill evenly between any number of people.

Health

Quick health and fitness calculators.

BMI Calculator

Calculate your Body Mass Index in metric or imperial units and see your weight category.

Date & Time

Work out ages, durations, and dates.

Age Calculator

Find an exact age in years, months, and days from any birth date.

Date Difference Calculator

Count the days, weeks, and months between two dates.

Text & Data

Format, encode, and inspect text and data.

JSON Formatter & Validator

Beautify, minify, and validate JSON with clear error messages — all in your browser.

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to text, with full Unicode support.

URL Encoder / Decoder

Percent-encode text for use in URLs, or decode an encoded URL back to readable text.

Text Case Converter

Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and more.

Word & Character Counter

Count words, characters, sentences, and paragraphs, with an estimated reading time.

Generators

Generate passwords, IDs, hashes, and more.

Password Generator

Create strong, random passwords with adjustable length and character sets.

UUID Generator

Generate random version-4 UUIDs individually or in bulk.

Hash Generator

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes of any text.

Converters

Convert between units, colors, and formats.

Color Converter

Convert colors between HEX, RGB, and HSL and preview them instantly.

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal.

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and back, in local time and UTC.

Unit Converter

Convert length, weight, temperature, volume, and more between metric and imperial units.