Online Toolbox

Encode text to Base64 or decode Base64 to text.

Count characters, bytes, words, and lines in real-time.

Convert colors between HEX, RGB, and HSL formats.

Format and validate your JSON data with syntax highlighting.

Convert text or URLs into QR codes.

Calculate your international age and Korean age from your birthdate.

Calculate your Body Mass Index (BMI) from height and weight.

Calculate monthly payments and total interest from loan amount, rate, and term.

Calculate percentages easily. X% of Y, what % is X of Y, percentage change.

Convert between length, weight, and temperature units.

Browse emojis by category — smileys, animals, food, travel, and more — or type a keyword in the search box to find what you need instantly. Click any emoji to copy it to your clipboard, then paste it directly into social media posts, chat messages, or documents.

Find HTML entities for reserved characters like &, <, and >, as well as copyright symbols, arrows, and mathematical operators — each shown with both its named and numeric code. Search by character or description to locate the entity you need, then click to copy the code to your clipboard for immediate use in HTML or CSS.

View the full list of HTTP status codes colour-coded by class: 2xx success, 3xx redirects, 4xx client errors, and 5xx server errors. Search by code number or keyword to quickly look up the meaning, common causes, and typical fixes — essential when developing or debugging APIs and web services.

Switch between Windows and Mac tabs to view platform-specific shortcuts, all organised by category — file management, browser navigation, text editing, screenshot tools, and more. Use it as a quick reference to discover shortcuts you haven't tried yet and speed up your everyday workflow.

See the core regex syntax — character classes, quantifiers, anchors, groups, and more — presented as a pattern, description, and example trio for quick reading. Use the search box to filter by keyword while coding, so you can look up the exact syntax you need without leaving your workflow.