SmartGap Tools

36 free online tools — converters, calculators, generators and developer utilities. No signup, privacy-friendly.

🧮 Calculators

Currency Converter

Convert between 30 currencies in real time

Loan Calculator

Calculate your loan payments

Calculate your body mass index

Calculate VAT (excl. ↔ incl. tax)

Percentage Calculator

Calculate percentages easily

Calculate your exact age

💻 Developer Tools

Discover your public IP and location

Format and validate your JSON

Identify your browser and OS

Base64 Encode/Decode

Encode and decode Base64

URL Encode/Decode

Encode and decode URLs

Generate SHA-256/384/512 hashes

Timestamp Converter

Convert Unix timestamp ↔ date

Test your regular expressions

🖼️ Image Tools

Image Compressor

Reduce your image file size

Image Converter

Convert JPEG, PNG, WebP, BMP

Resize your photos in one click

Crop and cut your photos online

Image Watermark

Add a text watermark to your photos

Rotate and flip your images

📝 Text & Content

Count words, characters and sentences

Convert UPPER, lower, Title, camelCase

Generate Lorem Ipsum text

Compare two texts line by line

Markdown Preview

Edit and preview Markdown

⏱️ Time & Conversion

Convert length, weight, temperature

Timer with sound alarm

Number Converter

Decimal, binary, octal, hexadecimal

Real-time world clock

Size conversion guide

🌐 Web Utilities

QR Code Generator

Create custom QR codes

Password Generator

Generate secure passwords

Color Converter

Convert HEX, RGB, HSL

Screen Resolution

Detect your screen resolution

Email Validator

Check if an email is valid

Favicon Generator

Create a favicon for your website