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Base64 Encoder & Decoder

Encode plain text to Base64 format or decode Base64 strings to human-readable text instantly.

Converts instantly as you type

Base64 Alphabet

Base64 uses 64 basic characters: capital letters (A-Z), lowercase letters (a-z), numbers (0-9), plus (+), and forward slash (/). It encodes 3 bytes of binary data into 4 characters.

Common Use Cases

  • Embedding small images inside CSS or HTML as data:image/... URIs.
  • Passing user credentials in HTTP Authorization Headers (e.g. Basic auth).
  • Encoding complex binary strings inside JSON payloads safely.

Complete Guide: How to Use the Base64 Encoder & Decoder

Converting plain text strings or binary hashes into Base64 format is standard practice in web engineering when passing complex character sets through HTTP requests, CSS files, or email pipelines. Our free online Base64 Converter delivers instantaneous bidirectional encoding and decoding, built on top of robust Unicode algorithms that prevent character damage on symbols or foreign scripts.

Step-by-Step Instructions

  1. To Encode: Type or paste plain text into the 'Plain Text' box. The encoded Base64 equivalent will generate instantly in the 'Base64 Output' box.
  2. To Decode: Paste a valid Base64 string into the 'Base64 Output' box. The original plain text will recover instantly in the 'Plain Text' box.
  3. Unicode Characters: Our encoder is fully Unicode-safe, allowing you to convert emojis, special symbols, and foreign languages without character corruption.
  4. Copy: Click the 'Copy' buttons adjacent to either textarea to save the results to your clipboard.

Key Features & Benefits

  • Instant Bidirectional Conversion: Encode as you type or decode as you paste in real-time.
  • Unicode-Safe Processing: Fully supports UTF-8 characters, symbols, emojis, and multi-byte text styles.
  • 100% Client-Side & Secure: All calculations are executed locally inside your browser context. Your proprietary strings never travel to the internet.
  • Whitespace Tolerance: Automatically filters out space and line-break bloating from raw Base64 inputs to decode smoothly.

FAQs about Base64 Encoder & Decoder

What is Base64 encoding?
Is Base64 a form of encryption?
Why do Base64 strings sometimes end with '='?
Can I convert multi-byte characters and emojis?