Why use Base64 encoding?

Base64 is used to encode binary data for safe transmission over text-based protocols. Common use cases include embedding images as data URIs in HTML/CSS, encoding credentials for HTTP Basic Authentication, sending binary attachments via email (MIME), storing binary data in JSON or XML configuration files, and safely passing complex data in URL parameters.

Is this Base64 tool free and secure?

Yes, this tool is completely free with no usage limits or sign-up required. All encoding and decoding happens locally in your browser using JavaScript. Your data never leaves your device and is not sent to any server, making it completely private and secure.

What can I encode with Base64?

You can encode any text or binary data with Base64. This includes plain text, URLs, JSON data, credentials, configuration files, and even binary files when converted to appropriate formats. Our tool fully supports UTF-8 text including emojis, special characters, and non-Latin alphabets.

Is my data processed locally?

Yes, absolutely. All Base64 encoding and decoding operations are performed entirely in your browser using built-in JavaScript functions. Your data never leaves your computer and is never uploaded to any server. This tool works completely offline once the page has loaded.

What's the difference between encode and decode?

Encoding converts your original text or data into Base64 format, making it safe for text-based transmission. Decoding reverses this process, converting Base64-encoded strings back to their original readable form. Use encode when preparing data for transmission, and decode when you need to read Base64-encoded content.

Why does Base64 make data larger?

Base64 encoding increases data size by approximately 33% because it converts every 3 bytes of input into 4 bytes of output. This overhead is the trade-off for making binary data safe to transmit over text-only protocols. While the data becomes larger, it becomes compatible with systems that can only handle text.

Base64 Encoder

Encode and decode Base64 strings instantly. Your data never leaves your browser.

Input

Output

Auto-detect mode (automatically decode Base64 or encode plain text)

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How to Use

1. Enter your text or Base64 string in the input field
2. Click "Encode" to convert text to Base64, or "Decode" to convert Base64 back to text
3. Enable "Auto-detect mode" to automatically determine whether to encode or decode
4. Use the "Copy Output" button to copy the result to your clipboard
5. Use "Swap" to move the output back to the input for chained operations

What is Base64?

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It's commonly used to encode data that needs to be stored or transferred over media designed to handle text. This includes embedding images in HTML or CSS, sending email attachments via MIME, and encoding data in URLs or JSON.

The encoding uses a set of 64 characters: A-Z, a-z, 0-9, plus (+), and forward slash (/). The equals sign (=) is used for padding. This makes Base64-encoded data safe for transmission over text-based protocols.

Common Use Cases

→ Data URIs: Embedding images directly in HTML/CSS files
→ API Authentication: Encoding credentials for Basic Auth headers
→ Email Attachments: MIME encoding for sending binary files
→ Configuration Files: Storing binary data in JSON or XML
→ URL Parameters: Safely encoding complex data in URLs

FAQ

Is my data secure?

Yes, all Base64 encoding and decoding happens locally in your browser. Your data is never sent to any server. This tool works entirely offline once loaded.

Does this tool support UTF-8 characters?

Yes, this tool fully supports UTF-8 text including emojis, special characters, and non-Latin alphabets. The encoding properly handles multi-byte characters.

Is Base64 encryption?

No, Base64 is encoding, not encryption. It transforms data into a different format but does not provide any security. Anyone can easily decode Base64 data. For security, use proper encryption methods.