Base64 Encoder/Decoder - Encode & Decode Base64 Online Free

How to Use the Base64 Encoder/Decoder

1. Type or paste your text in the input area — can be plain text or an existing Base64 string
2. Click Encode to convert plain text to Base64, or Decode to convert Base64 back to readable text
3. Copy the result with one click using the copy button
4. Switch modes — clear and toggle between encode and decode as needed
5. Verify — paste a decoded result back into the encoder to confirm round-trip accuracy

All processing happens in your browser. Your data never leaves your device.

Features

• Encode — convert plain text to Base64
• Decode — convert Base64 back to readable text
• Copy result — one-click copy to clipboard
• 100% private — everything runs in your browser

Use Cases

• Web development — encode image data or file contents for embedding in CSS or HTML
• API testing — decode Base64-encoded authentication tokens or API response payloads
• Email development — encode attachments or inline images for HTML email templates
• Data transmission — encode binary data for safe transmission over text-based protocols like JSON or XML
• Debugging — inspect Base64 strings returned by APIs to verify their contents

FAQ

What is Base64 encoding used for?

Base64 encodes binary data into ASCII text so it can be safely transmitted over text-based protocols. It’s commonly used in email attachments (MIME), data URIs in HTML/CSS, JSON APIs, and authentication headers.

Is Base64 encryption?

No. Base64 is an encoding scheme, not encryption. Anyone can decode a Base64 string easily. It’s designed for data transport compatibility, not security.

Does Base64 make data larger?

Yes. Base64 encoding increases data size by roughly 33%. This is the trade-off for making binary data safe to transmit over text-only channels.

Can I encode images with this tool?

This tool handles text input. For images, you’d typically use a programming language or command-line tool. The concept is the same — the image binary gets converted to a Base64 string.

Tips

• Use Base64 for data URIs when you need a self-contained HTML file with embedded images
• Never use Base64 for sensitive data — it’s encoding, not encryption
• Many APIs include Base64-encoded payloads; use the decode mode to inspect them quickly