Base64 Encoder/Decoder

How to Use Base64 Encoder/Decoder

Type or paste your text into the textarea, and use the Encode/Decode toggle to tell the tool which direction to convert. In Encode mode, any plain text you enter is instantly converted to its Base64 representation, which is commonly needed for embedding binary-safe data in JSON, URLs, or email attachments. In Decode mode, paste a Base64 string and the tool converts it back to readable plain text immediately, flagging an error if the string isn't valid Base64. If you need to encode an entire file rather than typed text, use the 'File to Base64' upload button — select any file from your device and the tool reads it using the browser's FileReader API, producing a Base64 string you can copy and use directly in your code, such as embedding a small image as a data URI in CSS or HTML. Below the output, a live character count shows you exactly how large the encoded or decoded result is, which is useful when you're checking whether a Base64 payload will fit within a size limit. A copy button next to the output lets you grab the result instantly without manually selecting text. Both the text conversion and file reading happen entirely in your browser using native `btoa`/`atob` functions and the FileReader API, meaning no file content or text you enter is ever uploaded anywhere.