🔐 Base64 Encode/Decode

Encode and decode text with standard Base64 and URL-safe Base64. Convert UTF-8 text to Base64, or decode Base64 strings back to plain text with support for Chinese, Japanese, Korean, emoji, and other Unicode characters. URL-safe mode replaces + and / with - and _ and can strip trailing = padding. Input text and output are processed in the current browser and are not uploaded to LittleOne Tools servers. Base64 is an encoding format, not encryption or security protection.