Is Base64 encoding secure?

No, Base64 is not encryption - it's just encoding. Anyone can decode Base64 data. It's used for data transmission compatibility, not security. For security, use proper encryption methods.

Can this tool handle images?

Yes, the tool can decode Base64 image data (data URIs). When you paste a Base64 image string, it will show you the decoded image. You can also encode images by pasting their data URI.

What about JWT tokens?

JWT tokens consist of Base64-encoded parts. This tool can decode the individual parts of a JWT token (header and payload) to show the JSON content. Note that this doesn't verify the signature.

Is there a size limit?

The tool can handle inputs up to several megabytes. Since all processing happens in your browser, the practical limit depends on your device's capabilities. Very large inputs may take a moment to process.

Base64 Encoder/Decoder

Q: What is Base64 encoding?

Base64 is a method of encoding binary data into ASCII text format. It's commonly used for transmitting data in environments that only support text, such as email attachments, data URIs in HTML/CSS, or JWT tokens.

Convert between text and Base64 encoding with automatic format detection

Supports images, JWT tokens, data URIs • 100% browser-based

Input (Text or Base64)

0 characters

Output

Auto-Detection

Automatically detects whether to encode or decode based on your input

Universal Support

Works with text, images, JWT tokens, data URIs, and any Base64 content

Browser-Based

All processing happens locally. Your data never leaves your browser.

Common Use Cases

✓Decode JWT tokens to inspect claims and headers

✓Encode API credentials for Basic authentication headers

✓Convert images to data URIs for embedding in HTML/CSS

✓Decode Base64 attachments from emails or APIs

Frequently Asked Questions

What is Base64 encoding used for?

Base64 encoding converts binary data to text format using only ASCII characters. It's used for transmitting data through systems that only support text, like email attachments, data URIs in web pages, or API payloads.

Is Base64 the same as encryption?

No, Base64 is encoding, not encryption. It's easily reversible and provides no security. Anyone can decode Base64 data. For security, use proper encryption methods.

Can I encode/decode images?

Yes! You can paste Base64-encoded images (data URIs) to decode them, or encode image data for use in HTML/CSS. The tool automatically detects image content.

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