Base64 Encode / Decode

How to use it

1. Type or paste plain text to encode, or a Base64 string to decode.
2. Press Encode or Decode.
3. Copy the result — or use "Use output as input" to run the reverse operation on it.

Key facts

• Text is converted through UTF-8 before encoding, so any Unicode character round-trips losslessly.
• When decoding, spaces and line breaks in the input are ignored — wrapped strings from emails decode fine.
• Base64 output is always a multiple of 4 characters; trailing = signs are padding, not data.
• Base64 is an encoding, not encryption. Anyone can decode it in milliseconds.

About this tool

Base64 rewrites arbitrary data as plain ASCII so it can travel safely through email, JSON strings and URLs. This tool works in both directions and treats your text as UTF-8 first, which is the step naive encoders skip — emoji, accented letters and non-Latin scripts all survive the round trip intact.

Decoding is deliberately strict. Input that is not valid Base64 gets a clear error rather than silent garbage, and bytes that decode to something other than valid UTF-8 text are reported as such. It all runs locally, in this tab.

Like every TextKit tool, the Base64 Encode / Decode runs entirely on your device. There is no account, no upload and no record of the content you process — close the tab and everything is gone.

Frequently asked questions