Base64 Encode / Decode
Free online Base64 encoder and decoder. Convert text to Base64 and decode Base64 to text directly in your browser. Fast, private, no uploads — everything runs client-side.
Text input
Output
In: 15 chars · Out: 20 chars
How to use
- Pick Encode or Decode at the top (Swap flips input and mode together).
- Paste text or Base64 into the input box; output updates live.
- Copy the result or download output.txt. Char counts show input vs output size.
FAQ
Is my data uploaded?
No. Encoding and decoding run 100% in your browser via TextEncoder and atob/btoa. Nothing leaves your device.
Does it support Unicode?
Yes. Input is encoded as UTF-8 bytes, so emoji and non-Latin scripts work correctly.