Answer: Base64 turns text into a safe ASCII string (letters, digits, + / =) for URLs, data URIs and APIs — and decodes it back. It is an encoding, not encryption.
Encoding runs entirely in your browser — your text stays on your device.
How to use this free Base64 tool
Paste your text and tap Encode, or paste a Base64 string and tap Decode.
Copy the result for an API, email header, or data URI.
Remember: Base64 is reversible — never use it to hide passwords or secrets.