Free Online Converters
Free online converters: Base64, URL encoding, JSON to CSV, timestamp converter, PDF tools, and more. Convert data formats instantly in your browser.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 strings instantly
Color Converter
Convert colors between HEX, RGB, HSL formats with live preview
PDF Merge & Split
Merge multiple PDFs into one or split a PDF into separate pages
JSON to CSV Converter
Convert JSON arrays to CSV format for spreadsheets and databases
Timestamp Converter
Convert between Unix timestamps and human-readable dates instantly
Tailwind to CSS
Convert Tailwind CSS classes to vanilla CSS properties
Number Base Converter
Convert numbers between decimal, binary, octal, and hexadecimal
Text to Binary
Convert text to binary representation and binary back to text
Aspect Ratio Calculator
Calculate and convert aspect ratios for images, videos, and screens
CSS Units Converter
Convert between px, rem, em, vw, vh, and other CSS units
About Converter Tools
All converter tools on ToolBox are completely free and run entirely in your browser. Your data never leaves your device — there are no server uploads, no accounts required, and no usage limits. Whether you're a developer, designer, student, or professional, these tools are built to save you time.