Is Base64 the same as encryption?

No. Base64 is an encoding scheme, not encryption. Anyone with the encoded string can decode it instantly. Use proper encryption if you need confidentiality.

What is the difference between standard and URL-safe Base64?

Standard Base64 uses plus (+) and slash (/) characters that have special meaning in URLs. URL-safe Base64 replaces them with hyphen (-) and underscore (_), making the output safe to include in URLs without percent-encoding.

Does the tool handle Unicode characters correctly?

Yes. Input is treated as UTF-8, so characters from any language including multi-byte scripts are encoded correctly.

Why does JWT not use padding?

The JWT specification requires Base64URL encoding without padding because the equals sign has a reserved meaning in some URL contexts and would need escaping.

Is my data sent to a server?

No. All encoding happens entirely in your browser using JavaScript. Nothing you type is transmitted anywhere.

How large an input can I encode?

The tool handles text inputs up to several megabytes comfortably in a modern browser. For very large binary files, use the file upload variant of the tool.

Base64 Encode/Decode — Free Online Tool

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Base64 Encode / Decode

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