Base64 Encoder/Decoder

Base64 encoding converts binary data — images, files, and binary strings — into a safe ASCII text format that can be transmitted through text-only channels like email, embedded in JSON payloads, or included in CSS as data URIs. It is also used to encode authentication credentials in HTTP headers and to represent binary data in XML documents. This encoder and decoder handles both directions: paste any text or binary string to encode it to Base64, or paste a Base64 string to decode it back to readable text. Supports UTF-8 input and handles both standard and URL-safe Base64 alphabet variants. A common scenario is debugging REST API integrations: when an API returns an image or PDF as a Base64 string inside a JSON response, you can paste that string here to instantly verify the content is correct before writing any decoding logic in your application. Another frequent use case is working with HTTP Basic Authentication — credentials are transmitted as a Base64-encoded "username:password" string in the Authorization header, and decoding that header value is a quick way to confirm what credentials a client is actually sending. Frontend developers also reach for this tool when embedding small icons or fonts directly into stylesheets as data URIs, encoding the raw file content to avoid an extra HTTP request. Developers debugging API responses, security engineers inspecting authentication tokens, and frontend engineers optimizing asset delivery all benefit from having a reliable Base64 tool at hand. All encoding and decoding happens entirely in your browser — no data is sent to any server, so sensitive credentials, proprietary file contents, and private tokens never leave your machine. This makes the tool safe to use with production secrets or confidential data, unlike online tools that process input server-side. Whether you are troubleshooting a malformed payload or preparing binary data for transmission, this tool provides an instant, private, and accurate conversion in either direction.