UTF-8 Base64 Encoder & Decoder (Client-Side Safe)
Transform plaintext to Base64 and decode Base64 strings back to clean UTF-8 text instantly.
Base64 Encoder & Decoder
Live workstation with automatic local history
Recent Base64 Encoder & Decoder History
0 runsHow to use the Base64 Encoder & Decoder
Follow these four simple steps for instant, production-grade results.
Type or paste your raw text (to encode) or Base64 string (to decode) into the input box.
Click "Encode" to generate RFC 4648 Base64 text, or "Decode" to restore the original string.
Copy the computed output directly into your application payload or configuration file.
Key Features Built for Professional Workflows
Full UTF-8 encoding support (handles non-Latin scripts, accents, and emojis safely)
Bidirectional conversion buttons for instant "Encode" and "Decode" modes
Robust error handling for malformed or corrupted Base64 strings
1-click output copying directly into clipboard
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Embedding small SVG graphics and web fonts directly into inline CSS data URIs.
Inspecting decoded JWT authorization header payloads and base64 webhook responses.
Preparing Basic Auth authorization headers (Authorization: Basic base64(user:pass)) for API testing.
Sanitizing complex configuration strings for command-line deployment arguments.
Technical Specifications & Standards
Implements RFC 4648 encoding standards with custom UTF-8 byte serialization (via encodeURIComponent/unescape wrapper) to avoid the classic JavaScript btoa() Latin-1 character out-of-range exception.
Frequently Asked Questions
Can this tool encode emojis and non-English characters?
Yes. Traditional JavaScript btoa() fails on characters outside Latin-1. Our implementation properly serializes UTF-8 bytes first, guaranteeing full support for Arabic, Chinese, Japanese, accents, and emojis.
Is it safe to decode private API keys or auth tokens here?
Yes. All decoding occurs locally in memory within your browser sandbox. The string is never transmitted across the network or logged in any backend system.
What happens if I try to decode an invalid Base64 string?
The tool catches the decode exception gracefully and indicates "Error: Invalid input for decode" without freezing your browser tab.
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