Base64 Encoder/Decoder

Base64 Encoder/Decoder is a free online tool for converting text to Base64 encoding or decoding Base64 strings back to readable plain text. Base64 encoding is essential for transmitting binary data over text-based protocols, embedding images in HTML or CSS, and working with web APIs that require encoded data. This tool provides bidirectional conversion with instant results—simply paste your text to encode it, or paste Base64-encoded data to decode it back to its original form. The encoder uses the standard Base64 alphabet (A-Z, a-z, 0-9, +, /) with proper padding, ensuring compatibility with all systems and programming languages that support Base64. Developers commonly use Base64 encoding for embedding small images directly in CSS or HTML (data URLs), encoding authentication credentials for HTTP Basic Auth, transmitting binary data through JSON APIs, and storing binary data in text-based formats like XML or JSON. The tool is also useful for decoding Base64 data you receive from APIs or configuration files to inspect the actual content. All encoding and decoding happens client-side using JavaScript's built-in btoa and atob functions, ensuring your data remains private. Works in all modern browsers, requires no installation, and handles text of any length instantly.