Base64 Encode / Decode
This Base64 tool encodes plain text to Base64 and decodes Base64 back to text, with full Unicode (UTF-8) support. Everything runs in your browser.
Last updated: July 2026
Base64 (specified in RFC 4648) encodes binary or text data using 64 printable ASCII characters, so it can travel safely through systems that only handle text — such as email or data URIs. Encoding increases size by roughly 33%, since every 3 bytes become 4 characters. This tool encodes and decodes with full Unicode (UTF-8) support, entirely in your browser.
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How to use Base64 Encode / Decode
- Paste your text or Base64 string.
- Choose Encode or Decode.
- Copy the result.
Frequently asked questions
Does it support emoji and non-English text?
Yes. The tool encodes via UTF-8, so emoji and all Unicode characters work correctly.
What happens with invalid Base64?
When decoding, malformed input shows a clear error instead of producing garbage.
Is my data sent anywhere?
No. Encoding and decoding happen entirely in your browser.
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