How to encode text to base64 or decode base64 to text

1. Pick the direction

   "Mode" toggles between Encode (text → base64) and Decode (base64 → bytes-as-text). The label below the radio explains which way the bytes are flowing.

2. Fill the payload

   "Text to encode, or base64 to decode" is one field reused by both modes. In Encode it takes UTF-8 text; in Decode it takes a base64 string with the standard A–Z a–z 0–9 + / = alphabet (a data: URL prefix is stripped automatically).

3. Press Run

   Encode returns base64 (no padding adjustments needed). Decode returns the UTF-8 view of the bytes, the byte count, and a 48-character hex preview from the start of the buffer.

4. Watch for binary in Decode

   If the decoded bytes contain a null byte, the result includes a note flagging that the payload is likely binary, not text. Read it as bytes (download or hex view) instead of UTF-8.