About This Free Base64 Tool
This is a free online Base64 encoder and decoder. It converts between plain text and Base64 encoded format instantly in your browser — no data is sent to any server.
What is Base64?
Base64 is a binary-to-text encoding scheme that represents binary data using 64 ASCII characters (A-Z, a-z, 0-9, + and /). It's commonly used for:
- Embedding images in HTML/CSS as data URIs
- Encoding email attachments (MIME)
- Storing complex data in JSON/XML
- Basic authentication headers (HTTP)
- Transmitting binary data over text-only channels
Features
- Bidirectional — Both encode (text→Base64) and decode (Base64→text)
- UTF-8 Support — Handles Chinese, Japanese, emoji, and all Unicode characters
- 100% Client-Side — Your data never leaves your browser
- Instant Results — No waiting, no page reloads
- Unlimited Size — No file size or usage limits
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