Base64 Encoder / Decoder

Base64 encoding is essential for embedding binary data in text-based formats like JSON, HTML, and CSS. Our free Base64 Encoder & Decoder lets you convert text, files, and images to and from Base64 instantly — all within your browser for complete privacy.

Base64 represents binary data using 64 printable ASCII characters (A-Z, a-z, 0-9, +, /), making it safe for embedding in JSON payloads, HTML data URIs, CSS backgrounds, email attachments (MIME), and XML documents. Our tool handles both directions: paste plain text or drop any file to encode, or paste a Base64 string to decode back to the original content.

Developers frequently use Base64 for embedding small images in CSS (data URIs to reduce HTTP requests), encoding API credentials in authorization headers, and transferring binary data through text-only channels. The tool supports URL-safe Base64 variants and automatically detects file types when decoding. For encoding images specifically, try our dedicated Image to Base64 Converter. Need to encode URLs instead? Use the URL Encoder & Decoder.