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Base64 Encoder Decoder

The Base64 Encoder Decoder converts text to Base64 and back, correctly. Many quick tools break on anything beyond plain ASCII; this one encodes your text as UTF-8 first, so 'héllo' or an emoji survives the round trip intact. Decoding validates the input and tells you plainly when it is not valid Base64 instead of returning garbage. Everything happens in your browser — handy when the string you are decoding is a token you should not paste into a stranger's server.

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How to use Base64 Encoder Decoder

  1. Paste your text (or Base64 string) into the box.
  2. Choose Encode or Decode.
  3. Read the converted result, or the clear error message if the input cannot be decoded.
  4. Copy or download the result.

Supported behavior

  • Full UTF-8 support in both directions: accents, CJK and emoji round-trip safely.
  • Decoding tolerates surrounding whitespace and missing padding in most pasted strings.
  • Invalid Base64 produces an explanation in the status line, not a silent failure.

Best for

  • Debugging API payloads, JWT segments and data URIs.
  • Encoding credentials or config values for headers and files.
  • Checking what a Base64 string in a log actually says.

Limits

  • Base64 is an encoding, not encryption — anyone can decode it. Never treat Base64 as protection for secrets.
  • Very large binary files belong in a dedicated tool; this one is designed for text-sized payloads.

Privacy notes

  • Tokens and strings you decode here never leave your browser — exactly where sensitive debugging data belongs.
  • No input is logged, cached or sent to an analytics endpoint by the tool.

Related tools

Generator URL Encoder Decoder Percent-encode and decode URL text the right way. Generator Password Generator Create strong random passwords that never leave your device. Generator Binary Code Translator Translate between text and 8-bit binary, both ways. Generator ROT13 Converter Rotate letters by 13 — encode and decode in one action.

Base64 Encoder Decoder FAQ

Why does my decoded text show strange characters?

The Base64 itself decoded fine, but the bytes were probably not UTF-8 text — they may be a binary file, a compressed payload, or text in another encoding. This tool reports that honestly instead of guessing.

Is Base64 encryption?

No. Base64 is a public, keyless encoding that anyone can reverse instantly. It makes data safe to transport through text-only channels; it does not hide the content.

Can it handle emojis and accented text?

Yes. Encoding converts text to UTF-8 bytes before Base64, and decoding interprets the bytes as UTF-8, so 'héllo' and emoji round-trip exactly.