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Base64 Text Encoder & Decoder

Supports standard Base64 and URL-Safe modes with full UTF-8 multilingual compatibility

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Base64 Text Encoder & Decoder

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テキストまたは Base64 文字列を入力0 字元
変換結果

Base64 Text Encoder & Decoder

Pure client-side Base64 text encode and decode tool supporting UTF-8 Chinese characters and RFC 4648 URL-safe mode.

よくある質問

What is the difference between standard and URL-Safe Base64?
Standard Base64 uses + and /, which can cause issues in URLs. URL-Safe Base64 replaces them with - and _ and omits padding.
Why do some Base64 decoders produce garbled characters with Unicode text?
Native browser atob only handles Latin1 characters. This tool utilizes TextEncoder/TextDecoder for proper UTF-8 handling.