Base64 Encoder & Decoder
Encode plain text strings into Base64 format or decode Base64 data with full UTF-8 character and emoji support.
What is Base64 Encoder & Decoder?
Base64 translates binary data into a 64-character ASCII representation (A–Z, a–z, 0–9, +, /) according to RFC 4648 standards by converting every 3 bytes (24 bits) into four 6-bit index values. Our in-browser tool features full UTF-8 emoji support and a URL-safe Base64 mode with zero server data logging.
Designed for accuracy, speed, and privacy, this tool runs entirely on your local device with zero network latency.
How to Use the Base64 Encoder & Decoder
- 1Select your mode: "Encode" to convert text to Base64, or "Decode" to convert Base64 back to plain text.
- 2Type or paste your text into the editor, or upload a local text file.
- 3Toggle "URL-Safe Base64" if encoding query parameters (replaces + with - and / with _, removing = padding).
- 4Click "Copy Result" or download the encoded/decoded string directly.
Formula & Calculation Logic
Utilizes the Web API TextEncoder to transform UTF-8 strings into binary Uint8Arrays before Base64 serialization, preventing character encoding corruption on foreign alphabets and emojis.
Base64 Encoding: 3 Bytes (24 bits) -> 4 Base64 Chars (4 × 6 bits) | RFC 4648 StandardBase64 Encoder & Decoder Frequently Asked Questions
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