Base64 Encode & Decode Online
Encode and decode UTF-8 text strings to and from Base64 representations.
Interactive Tool Workspace
Loading secure in-browser engine for Base64 Encode & Decode...
Processing Limits & Device Capabilities
Executes UTF-8 multi-byte Base64 conversions in local memory. Unlimited string length with zero server transmission.
How to Use Base64 Encode & Decode
- Enter plain text or Base64 into the input textarea.
- Click
- to create an ASCII Base64 string, or
- to restore plain text.
- Click
- to copy the resulting string to your clipboard.
About Base64 Encode & Decode
Base64 Encode & Decode transforms binary or text data into 64-character ASCII representations for Basic Auth headers, data URIs, API payloads, and configuration files. Powered by client-side TextEncoder and TextDecoder, it handles full multi-byte international UTF-8 and modern emojis without data corruption.
Frequently Asked Questions
What is Base64 encoding used for?
Base64 represents arbitrary bytes using 64 printable ASCII characters (A-Z, a-z, 0-9, +, /) so data can be transmitted across text-based protocols like HTTP headers, email (MIME), and JSON without character corruption.
Does this tool support international characters and emojis?
Yes! Standard JavaScript btoa() only supports Latin-1 characters and crashes on emojis. Our engine uses standard TextEncoder and TextDecoder to support all multi-byte Unicode characters, Asian scripts, and modern emojis flawlessly.
What causes an "Invalid Base64 sequence" decoding error?
This error occurs when the input contains characters outside the Base64 alphabet, improper padding (= signs), or an incomplete byte group. Verify that your string consists strictly of valid Base64 characters.
Is Base64 a form of encryption?
No. Base64 is an open encoding scheme designed for data serialization, not security. Anyone can decode a Base64 string instantly without a key. Do not rely on Base64 alone to protect passwords or secrets.
Is my data transmitted or stored anywhere?
No. All conversions execute strictly inside your browser memory using client-side JavaScript. No text, tokens, or credentials ever touch a network connection.