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Free Online Tools & Calculators

Encode, format, generate, convert and calculate. Everything runs in your browser and nothing gets uploaded.

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Popular Tools

61 tools

Percentage Calculator

Popular

Calculate percentages and changes

UK Take-Home Pay Calculator

Popular

UK salary after tax with Scottish rates

BMI Calculator

Popular

Calculate Body Mass Index

JSON Formatter & Beautifier

Popular

Format, beautify, and validate JSON

Etsy Fee Calculator

NewPopular

Calculate Etsy seller fees and profit

UUID Generator

Popular

Generate random UUID v4 identifiers

Password Generator

Popular

Generate secure random passwords

Unit Converter

Base64 Encode & Decode

Popular

Encode and decode Base64 strings

URL Encode & Decode

Random Number Generator

NewPopular

Generate random numbers in any range

MD5 Hash Generator

Popular

Generate MD5 hash from text

SHA-256 Hash Generator

Popular

Generate SHA-256 hash from text

Unix Timestamp Converter

Popular

Convert Unix timestamps to dates

JWT Decode & Inspect

Popular

Decode and inspect JWT tokens

QR Code Generator

Popular

Generate QR codes from text or URLs

JSON to YAML Converter

Popular

Convert between JSON and YAML formats

Number Base Converter

Color Converter

Popular

Convert between HEX, RGB, HSL, CMYK

Regex Tester & Debugger

Popular

Test and debug regular expressions

Case Converter

Popular

Convert text between different cases

Image Format Converter

Popular

Convert between PNG, JPG, and WebP

HEIC to JPG/PNG Converter

Popular

Convert iPhone HEIC photos to JPG/PNG

Image Compressor

Popular

Compress images to reduce file size

Merge PDF

Popular

Combine multiple PDFs into one

Convert images to PDF

PDF to Image Converter

Popular

Convert PDF pages to JPG/PNG images

Word to PDF Converter

Popular

Convert Word documents to PDF

JSON Validator

Popular

Validate and debug JSON syntax

URL Parser & Analyzer

Popular

Parse URLs into their components

Cron Expression Parser

Popular

Parse cron expressions to plain English

Word & Character Counter

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Count words, characters, and more

VAT Calculator UK

Popular

Add or remove UK VAT instantly

eBay Fee Calculator UK

Amazon Seller Fee Calculator UK

UK Student Loan Repayment Calculator

Stamp Duty Calculator (SDLT)

Mortgage Overpayment Calculator

UK Pension Calculator

NewPopular

How much pension do you need to retire?

Mortgage Calculator

Loan Calculator

Compound Interest Calculator

Popular

Calculate compound interest over time

Auto Loan Calculator

NewPopular

Calculate car payments and total cost

Calorie & TDEE Calculator

Popular

Calculate daily calorie needs and TDEE

TDEE Calculator

NewPopular

Calculate TDEE and daily calorie needs

Inches to CM Converter

Popular

Convert inches to centimeters

KG to LBS Converter

Popular

Convert kilograms to pounds

Celsius to Fahrenheit Converter

Popular

Convert Celsius to Fahrenheit

Countdown Timer & Stopwatch

Paycheck Calculator

NewPopular

Calculate net take-home pay from salary

Debt Payoff Calculator

Grade Calculator

Text to Binary Converter

Macro Calculator

Pregnancy Due Date Calculator

Running Pace Calculator

Alcohol Units Calculator

Hours Calculator

Popular

Calculate hours between times

Rent vs. Buy Calculator

NewPopular

Compare renting vs. buying a home

Home Affordability Calculator

NewPopular

Calculate how much house you can afford

Browse by Category

Encoding & Decoding

Encode and decode data in various formats including Base64, URL, HTML entities, and more.

Formatters & Beautifiers

Format, beautify, and minify code in JSON, XML, SQL, HTML, CSS, JavaScript, and more.

Generators

Generate UUIDs, passwords, random strings, lorem ipsum, QR codes, and more.

Hash & Crypto

Generate hashes (MD5, SHA), encrypt and decrypt data, and work with cryptographic tools.

Developer Converters

Convert between JSON, YAML, XML, CSV, TypeScript interfaces, and more.

Number & Color Converters

Convert between number bases, color formats, file sizes, and more.

Text Tools

Count words, convert case, compare text, sort lines, find and replace, and more.

Regex Tools

Test, debug, and learn regular expressions with interactive tools.

Date & Time

Convert timestamps, calculate date differences, parse cron expressions, and more.

Math & Science

Scientific calculator, statistics, percentage calculator, matrix operations, and more.

Image & Media

Resize images, convert formats, generate Base64, pick colors, and more.

Validators

Validate JSON, XML, YAML, emails, URLs, credit cards, and more.

Network & Web

Parse URLs, calculate subnets, look up HTTP status codes, and more.

Utilities

Diff checker, chmod calculator, cron parser, and other handy utilities.

Financial

Mortgage, loan, compound interest, tip, and discount calculators for everyday financial decisions.

Health & Fitness

BMI, calorie, TDEE, and other health and fitness calculators.

Unit Converters

Convert between length, weight, temperature, volume, and other measurement units.

Why CalcHive?

Instant Results

Type, paste or drop a file and see output immediately. No waiting for server round-trips.

Runs Locally

Everything happens in your browser tab. Files and text stay on your machine.

No Account Needed

Just open a tool and use it. No sign-up, no email, no paywall.