Online Base64 Encoder & Decoder
Encode plain text into Base64 or decode Base64 data back to readable UTF-8 strings. Supports all international characters, symbols, and emoji safely without character corruption.
Runs 100% locally in your browser, guaranteeing total privacy for sensitive tokens, keys, and encoded payloads.
100% Client-Side Processing & Privacy Guarantee
All processing takes place strictly inside your client browser using WebAssembly, Canvas, and Web Workers. Your files, documents, and data never leave your device and are never sent to external servers.
Technical Specifications & Browser Capabilities
Local runtime details and instant zero-server processing environment
Step-by-Step Instructions
1. Enter Data
Type or paste plain text into the top box, or Base64 into the bottom box.
2. Encode or Decode
Click Encode to generate Base64 or Decode to restore plain UTF-8 text.
3. Copy Output
Use the copy button to transfer the result directly to your clipboard.
Core Advantages & Features
UTF-8 and Emoji Support
Implements TextEncoder and TextDecoder to avoid standard Latin-1 btoa/atob encoding errors with multibyte characters.
Two-Way Conversion
Seamlessly toggle between encoding and decoding with intuitive Swap controls.
Robust Error Handling
Clear notifications when decoding corrupted or invalid Base64 input strings.
Client-Side Privacy
Your strings and credentials are never transmitted over network connections.
Frequently Asked Questions
Why do standard Base64 tools fail on emojis and accents?
Is it safe to decode private tokens here?
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