Most Popular Tools

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JSON Formatter

Format, minify, and validate JSON data. Features syntax highlighting and copy functionality.

Password Generator

Generate secure, random passwords instantly. Customize length, uppercase, lowercase, numbers, and symbols.

BMI Calculator

Calculate your Body Mass Index (BMI) and check your health category. Supports both metric and imperial units.

Loan Calculator

Calculate monthly payments and interest for equal payment and equal principal methods.

QR Code Generator

Convert URLs, text, and contacts into QR codes.

Age Calculator

Calculate your international age, Korean age, and days until your next birthday.

Developer Favorites

Top tools loved by developers worldwide

Regex Tester

Test regular expression patterns and find matching items. View results in real-time and configure flags.

JWT Decoder

Decode JWT (JSON Web Token) to view header, payload, and signature. Supports expiration time and claim validation.

Base64 Converter

Encode text to Base64 or decode Base64 to text. Supports all text including UTF-8.

Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hash values for your text. Securely processed in your browser using Web Crypto API.

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Color Picker

Select colors and convert them to HEX, RGB, and HSL formats. Includes preset color palette and RGB sliders.

Length Converter

Convert between metric (mm, cm, m, km) and imperial (inch, ft, yd, mile) units.

Tip Calculator

Calculate tip amount and total. Split the bill evenly among multiple people.

Image Compressor

Compress images to reduce file size. Adjust quality, resize dimensions, and choose output format (JPEG, PNG, WebP).

Cron Expression Generator

Generate cron expressions visually with human-readable descriptions and next run times preview.

UUID Generator

Generate secure, random UUID v4 identifiers. Create multiple UUIDs at once and copy them easily.