Base64 Encoder / Decoder
Instantly encode text to Base64 or decode Base64 back to plain text. Supports URLs, JSON, and arbitrary strings.
Plain Text
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Base64
What is Base64?
Base64 encodes binary data as ASCII text using 64 printable characters. Used in email attachments, data URLs, API tokens and JWT.
URL-Safe Base64
Standard Base64 uses + and / which are unsafe in URLs. URL-safe Base64 replaces them with - and _.
Size overhead
Base64 increases data size by ~33%. Every 3 bytes of input become 4 characters of Base64 output.
Common uses
Embedding images in HTML/CSS (data:image/...), storing binary in JSON, HTTP Basic Auth, JWT tokens.