Base64 Encoder/Decoder

Convert text or binary data to Base64 encoding and decode Base64 strings back to their original form. Base64 represents binary data as ASCII characters, making it safe to transmit images, files, and cryptographic keys through text-only channels. Common uses include data URI encoding for images in HTML or CSS, embedding binary content in JSON payloads, HTTP Basic Authentication headers, and MIME email attachments. Supports standard Base64 and URL-safe Base64 (replacing + with - and / with _ for safe URL use). Encode and decode files by uploading or pasting a Base64 string. Input and output byte sizes are shown so you understand the approximately 33% overhead. All processing runs in your browser. No account required.