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Base64 Encode & Decode

Q: What is Base64 used for?

Embedding images as data URIs, encoding email attachments, storing binary data in JSON/XML, and HTTP authentication.

Q: Can I decode any Base64 string?

As long as it's valid Base64. Invalid input shows a clear error.

Q: Does it support Chinese characters and emoji?

Yes, full UTF-8 support for all Unicode characters.

Q: Is my data sent to a server?

No. All processing happens in your browser.

Convert between plain text and Base64 encoding instantly. Supports UTF-8, Unicode, and all text formats.

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About This Base64 Tool

A free online Base64 encoder and decoder that converts between plain text and Base64 encoded format instantly. Base64 is a binary-to-text encoding scheme that represents binary data using 64 ASCII characters (A-Z, a-z, 0-9, +, /). It's commonly used for embedding images in HTML/CSS, encoding email attachments (MIME), storing data in JSON/XML, and basic authentication headers.

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
Unlimited Size — No file size or usage limits

How to Use

Choose Encode (text → Base64) or Decode (Base64 → text)
Type or paste your content into the input area
Click Convert to see the result
Copy, swap, or clear as needed

Frequently Asked Questions

What is Base64 used for?

Base64 is used for embedding images as data URIs, encoding email attachments (MIME), storing binary data in JSON/XML, and HTTP basic authentication.

Can I decode any Base64 string?

As long as it's valid Base64 encoding. Invalid input will show a clear error message.

Does it support Chinese characters and emoji?

Yes. The UTF-8 encoding ensures full support for Chinese, Japanese, emoji, and all Unicode characters.

Is my data sent to a server?

No. All encoding and decoding happens entirely in your browser. Nothing is sent anywhere.