Encode or decode Base64 instantly in your browser. Supports text, files, drag-and-drop, history, and download — 100% local, no data uploaded. This free online Base64 encoder/decoder runs entirely in your browser — no data is ever uploaded to a server. How to Use 1. Enter your input — type or paste your text or file to encode/decode. 2. See live results — the tool updates instantly as you type. 3. Copy or download — copy the output to clipboard or download it. 4. History — your recent inputs are saved locally and can be pinned for quick access. Example Enter "Hello World" in encode mode — output is SGVsbG8gV29ybGQ=. Switch to decode, paste that string, and it returns the original text. History keeps your recent conversions.