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Processing happens entirely in your browser with zero server roundtrips. Instant results.
Base64 Encode & Decode
Fast, secure, and 100% client-side. Your data never leaves your browser.
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Features
100% Secure
Your data never leaves your device. No server storage, no logging, complete privacy.
API Access
RESTful API at /api/encode and /api/decode for automation and AI agents.
What is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It's widely used in web development for embedding images in CSS/HTML, encoding email attachments (MIME), storing complex data in JSON or XML, and handling authentication tokens like JWT.
How Does It Work?
Base64 takes groups of 3 bytes (24 bits) and splits them into 4 groups of 6 bits each. Each 6-bit group maps to one of 64 printable ASCII characters (A-Z, a-z, 0-9, +, /), with = used as padding. This makes it safe to transmit binary data through text-based systems.
API for Developers & AI
Integrate our Base64 tool directly into your workflows. Send a POST request to /api/encode with a JSON body containing your text, or to /api/decode with a JSON body containing the Base64 string. Our full OpenAPI specification is available for LLM orchestrators, LangChain agents, and automation platforms.