What is Base64 Encoder / Decoder?
Base64 is a group of binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation.
How to Use Base64 Encoder / Decoder
- 1Select mode: "Encode" (Text -> Base64) or "Decode" (Base64 -> Text).
- 2Type or paste string into the input box.
- 3Toggle "URL-Safe" if needed for query parameter encoding.
- 4The converted result displays in real-time.
- 5Click "Copy Result".
How Does Base64 Encoder / Decoder Work?
Uses JavaScript native `btoa()` and `atob()` with UTF-8 percent-encoding wrappers for full Unicode character support.
Encode: btoa(encodeURIComponent(text)) | Decode: decodeURIComponent(atob(base64))Practical Examples
Text Encoding
Input: "SunloopMedia Tools"
Frequently Asked Questions
Is Base64 an encryption algorithm?
No! Base64 is an encoding scheme, NOT encryption. Anyone can decode Base64 back to plain text instantly. Never rely on Base64 alone to protect secret data.
Why does Base64 output end with "=" padding characters?
Base64 processes input in 3-byte chunks (24 bits). If the input byte length is not divisible by 3, trailing `=` or `==` padding characters are appended to complete the 24-bit block.
What is URL-Safe Base64?
Standard Base64 uses `+` and `/` characters, which have special meanings in URLs. URL-safe Base64 replaces `+` with `-` and `/` with `_`.
Does this tool support non-English Unicode characters?
Yes, our encoder uses UTF-8 byte mapping, correctly handling non-ASCII text, accented letters, and emojis.
Is my input sent to a remote server?
No, all encoding/decoding is performed locally in your browser session.