Base64 Encoder & Decoder
Encode or decode text to Base64 format instantly in your browser. Perfect for API keys, credentials, and data transfer.
📝 Input
0 characters
🔄 Mode
Encoding to Base64
📤 Output
Waiting for input...
Secure & Fast Online Base64 Encoder & Decoder
Base64 encoding is a widely used method for encoding binary data into ASCII text. It is commonly used for transmitting data over text-based protocols like email or JSON, embedding images in CSS/HTML, and storing complex data in XML or JSON structures. The OptMyTool Base64 Encoder & Decoder lets developers instantly encode or decode text and files directly in the browser.
🔒 Zero Server Exposure
Unlike online tools that route your data through backend APIs, OptMyTool encodes and decodes your Base64 strings locally in browser memory using native btoa/atob functions.
📁 File Support
Upload .txt files to encode or decode entire file contents at once, with instant download of the processed output.