Base64 Encoder / Decoder
Convert text to Base64 and back with full UTF-8 support, including emoji and international characters.
What does this tool do?
Base64 encoding represents text bytes as printable characters. Enter text to encode it, or paste a Base64 string to decode it. Base64 is reversible encoding, not encryption.
When to use this tool
Use this Base64 converter when a system represents UTF-8 text as printable characters. Encode plain text or decode an existing string to inspect its contents. This text tool is not a binary file converter, and Base64 does not make confidential data secure.
How to use Base64 Encoder / Decoder
- Enter text to encode or a Base64 string to decode.
- Choose Encode or Decode.
- Copy the output, or swap it back into the input.
A quick example
Hello → SGVsbG8=
Common questions
Does it support Unicode?
Yes. Text is converted to UTF-8 bytes before encoding and decoded using a strict UTF-8 decoder.
Why does decoding fail?
Check for invalid characters, incorrect padding, or binary content that is not valid UTF-8 text.
Working with a large input? Text converters accept up to 1,000,000 characters. Regex test text is limited to 50,000 characters and JWTs to 100,000.