Free Online Encoders - Base64, URL, HTML Entities
Encode values safely for URLs, APIs, and markup. Everything runs in your browser, so sensitive input stays on your device.
9 tools in this section
Encode Text to Base64 Online
Encode any text or file to Base64 format instantly. Free online Base64 encoder with UTF-8 support.
URL Encode Text Online
Encode special characters for safe use in URLs and query strings. Free online URL encoder with percent-encoding.
Encode HTML Entities Online
Encode special characters as HTML entities to prevent XSS and display issues. Free online HTML entity encoder.
Encrypt Text with AES-256 Online
Encrypt and decrypt text using AES-256-GCM encryption with a password. Free online AES encryption tool - all processing in your browser.
Encode Text with Caesar Cipher Online
Encrypt text using the Caesar cipher with any shift value. Free online Caesar cipher encoder and ROT13 tool.
Text to Base64 Encoder - Free Online Tool
Encode any text or string to Base64 online for free. Supports full Unicode, runs entirely in your browser, no signup.
Encode Query String Online
URL-encode a query string or parameter online for free. Safely escape spaces, ampersands, and special characters for API requests.
Encode HTML Online
Encode HTML online to escape <, >, &, and quotes into entities. Free HTML escape tool that prevents XSS and displays code as text, no signup.
Encrypt Text with a Password Online
Encrypt text with AES-256 using a password, then decrypt it with the same password. Free online text encryption tool that runs in your browser.
Full Tool Pages
About These Tools
Every tool in this section is free and runs entirely in your browser on ToolBox. There are no uploads, no accounts, and no usage limits, so your files and data stay on your own device. Browse the full tool directory for everything else.