Base64 Encoder

What is Base64 Encoding?

Base64 encoding is a method of converting binary data into a printable ASCII string format. It is widely used in email (MIME), data URLs, JSON Web Tokens (JWT), and API authentication headers. The encoding takes every 3 bytes of binary data and converts them into 4 Base64 characters from a 64-character alphabet (A-Z, a-z, 0-9, +, /). This makes it safe for transmission through text-based protocols that may corrupt binary data. Base64 is not encryption — any Base64-encoded data can be easily decoded. Use this free online Base64 encoder to quickly convert any text to Base64 format right in your browser.

How to Use the Base64 Encoder

1. Enter or paste the text you want to encode into the input field above.
2. Click the Encode button to convert your text to Base64.
3. Click Copy to copy the encoded result to your clipboard.

When to Use Base64 Encoding

• Embedding images directly in HTML/CSS using data URIs
• Encoding credentials for HTTP Basic Authentication
• Storing binary data in JSON (e.g., JWTs, API payloads)
• Encoding email attachments (MIME)
• Passing binary data through URL query strings