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Encode and decode Base64 instantly. Private — nothing leaves your browser.
Base64 encodes any data as plain ASCII text so it can travel safely through systems built for text — email bodies, JSON fields, data URLs, and HTTP headers. This tool encodes and decodes Base64 instantly in your browser, with nothing sent to a server.
It's a everyday helper for developers, and it handles Unicode correctly so accented characters and emoji survive the round trip.
Base64 maps every three bytes of input onto four printable characters drawn from a 64-symbol alphabet, padding with '=' when the input length isn't a multiple of three. Decoding reverses that mapping. Because the output uses only safe characters, binary or Unicode data can pass through channels that would otherwise corrupt it.
Everything runs locally, so you can safely encode sensitive strings — the data never leaves your device.
Encoding 'Sovereign' yields 'U292ZXJlaWdu', and decoding it returns the original text exactly — a quick way to prepare a value for a data URL or verify an API token fragment.
No — it's reversible encoding, not encryption. Anyone can decode it, so never use it to protect secrets.
Yes — it encodes UTF-8 correctly so Unicode survives the round trip.
No — encoding and decoding happen entirely in your browser.
That's padding so the output length is a multiple of four; it's normal.
Yes — free, and available in 25 languages.