Encode text
Input: Hello
Output: SGVsbG8=
"Hello" encoded to Base64 is SGVsbG8=.
Base64 encode / decode
Encode text to Base64 or decode Base64 back to text — useful for data URIs, tokens, and config values.
Ready.
How it works
- Base64 maps every 3 bytes of input to 4 characters from A–Z, a–z, 0–9, + and /.
- Encoding is reversible: decoding the output returns the exact original bytes.
- Text is read as UTF-8 before encoding, so emoji and accents survive the round trip.
Worked examples
Encode a phrase
Input: Hello, RapidUnits!
Output: SGVsbG8sIFJhcGlkVW5pdHMh
UTF-8 text is encoded byte by byte, then mapped to Base64.
Decode Base64
Input: U0VP
Output: SEO
Base64 U0VP decodes back to the text SEO.
FAQ
Is Base64 encryption?
No. Base64 is encoding, not encryption — anyone can decode it. Never use it to protect secrets.
Why is there a = at the end?
The = signs are padding so the output length is a multiple of 4 characters.
Does this run on a server?
No. Encoding and decoding happen entirely in your browser; nothing is uploaded.
Related tools
Updated: June 7, 2026