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Base64 Encoder & Decoder (UTF-8 & Base64URL)

Fast bi-directional Base64 transformer. Convert standard and UTF-8 Unicode text into Base64 encoded strings, or decode Base64 payloads back to readable plain text with URL-safe mode support.

⚡ Quick Answer

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format by translating it into a radix-64 representation.

💡 How It Works

Uses `TextEncoder`/`TextDecoder` and `btoa`/`atob` with UTF-8 byte stream handlers to ensure international character safety.

📖 How to Use Base64 Encoder / Decoder

  1. Enter or paste your text.
  2. Select Encode to convert text to Base64, or Decode to extract text from Base64.
  3. Copy the converted result.

✨ Key Features

  • Full UTF-8 Unicode support (handles emojis and international characters)
  • Base64URL mode (`-` and `_` replacing `+` and `/`)
  • Live instant switching between encode and decode

❓ Frequently Asked Questions

What is the difference between standard Base64 and Base64URL?

Standard Base64 uses `+` and `/` with `=` padding, while Base64URL uses `-` and `_` with no padding, making it safe for URLs and filenames.