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
Base64 encode and decode online - convert text to Base64 or decode Base64 strings instantly, free
Color Converter
Free online color converter - convert colors between HEX, RGB, HSL formats with live preview
PDF Merge & Split
Merge PDF online free or split PDF into pages - no upload to servers, all processing happens in your browser
JSON to CSV Converter
Free online JSON to CSV converter - convert JSON arrays to CSV format for spreadsheets and databases
Timestamp Converter
Free online timestamp converter - convert between Unix timestamps and human-readable dates instantly
Tailwind to CSS
Free online tailwind to CSS - convert Tailwind CSS classes to vanilla CSS properties
Number Base Converter
Free online number base converter - convert numbers between decimal, binary, octal, and hexadecimal
Text to Binary
Free online text to binary - convert text to binary representation and binary back to text
Aspect Ratio Calculator
Free online aspect ratio calculator - calculate and convert aspect ratios for images, videos, and screens
CSS Units Converter
Free online CSS units converter - convert between px, rem, em, vw, vh, and other CSS units
Unit Converter
Free online unit converter - convert between units of length, weight, temperature, speed, and data storage
HTML to Markdown
Free online HTML to markdown - convert HTML markup to clean, readable Markdown syntax
YAML ↔ JSON Converter
Free online YAML ↔ JSON converter - convert between YAML and JSON formats with validation and formatting
Morse Code Converter
Free online morse code converter - convert text to Morse code and Morse code back to text with audio playback
CSV to JSON Converter
Free online CSV to JSON converter - convert CSV data to JSON format with delimiter options and preview
XML to JSON Converter
Free online XML to JSON converter - convert XML documents to JSON format
YAML to CSV Converter
Free online YAML to CSV converter - convert YAML arrays to CSV spreadsheet format
Image Format Converter
Free online image format converter - convert between JPG, PNG, WebP, and AVIF formats
SVG to PNG Converter
Free online SVG to png converter - convert SVG images to PNG or JPEG format
Currency Converter
Free online currency converter - convert between currencies with current exchange rates
HTML to JSX Converter
Free online HTML to JSX converter - convert HTML markup to valid React JSX with automatic attribute and style transformations
JSON to XML Converter
Free online JSON to XML converter - convert JSON data to XML format instantly
TOML/JSON Converter
Convert between TOML and JSON online - bidirectional converter with full TOML v1.0 support
ROT13 / Caesar Cipher
ROT13 encoder/decoder and Caesar cipher with brute force cracker and frequency analysis
Punycode Converter
Convert internationalized domain names between Unicode and Punycode (IDN encoding) online
HTML to PDF Converter
Convert HTML to PDF online free - create downloadable PDF documents from HTML code in your browser
PDF Watermark
Add text or image watermarks to PDF documents online free - stamp text, logos, or signatures on any PDF
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.