Base64 is a binary-to-text encoding scheme that represents binary data as ASCII characters. It's used for embedding images in HTML, transmitting data in URLs, and email attachments.

Is this Base64 tool free?

Yes, 100% free with no limits. Encode or decode as much data as you want.

Does it handle Unicode?

Yes. It properly handles UTF-8 characters including emojis, accented characters, and non-Latin scripts.

All encoding/decoding happens in your browser. Your data never leaves your device.

✓ Unicode safe✓ File support✓ Free forever

Free Base64 Encoder / Decoder Online

Encode text to Base64 or decode Base64 back to text. Handles Unicode and files.

Plain Text

Base64 Output

How to use Base64 Encoder / Decoder

Three steps. Instant results.

Step 1

Paste text or upload a file to encode, or paste a Base64 string to decode.

Step 2

Click Encode or Decode.

Step 3

Copy the result to clipboard.

How Base64 Encoder / Decoder works

This tool uses JavaScript's built-in btoa() and atob() functions with a UTF-8 wrapper for proper Unicode support. When encoding, it first converts the string to UTF-8 bytes using encodeURIComponent, then applies Base64 encoding. When decoding, it reverses the process. For file uploads, it uses FileReader to read the file as a data URI, which is already Base64-encoded. Everything runs in your browser — your data never leaves your device.