Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 back to UTF-8 text in your browser.
Encoding preserves the exact UTF-8 text you enter, including whitespace and line breaks.
Base64 output
What is Base64?
Base64 is a way to represent bytes as plain text using a standard alphabet of letters, numbers, plus, slash, and optional equals-sign padding. It is useful when binary or Unicode text needs to travel through systems that expect text-safe data.
How Base64 encoding works
Base64 groups bytes into sets of three and represents each group as four text characters. When the final group has fewer than three bytes, equals-sign padding can be added. This tool uses UTF-8 conversion before encoding text, so spaces, line breaks, accented characters, non-Latin scripts, and emoji are preserved.
Base64 encoding vs encryption
Base64 is not encryption. It does not use a secret key and does not protect sensitive information. Anyone who has Base64 text can decode it, so do not use Base64 to protect passwords, tokens, secrets, or personal data.
Common Base64 use cases
UTF-8 and Unicode support
Naive browser Base64 helpers can fail with arbitrary Unicode text. This tool uses TextEncoder and TextDecoder so accented characters, emoji, non-Latin scripts, and multiline input round-trip as UTF-8 text.
Is Base64 secure?
No. Base64 only changes representation. It can make data safe to place in text formats, but it does not hide, encrypt, or secure the original content. Use encryption or a proper secret-management workflow when confidentiality matters.
How this tool protects privacy
Encoding and decoding happen entirely in your browser. The tool does not upload your input or output, does not place it in URLs, and does not save it in local storage, session storage, cookies, or analytics events.