Base64 Encoder & Decoder
Fast, secure, client-side Base64 string conversion.
Base64 Encoder / Decoder
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Understanding Base64
As a developer, you will encounter Base64 constantly. Whether you are embedding a small image directly into a CSS file, transmitting an authentication token (like JWTs), or passing complex binary data inside a JSON payload, Base64 is the go-to standard.
How to Use This Tool:
- Encode Mode: Type or paste standard plain text (including emojis and special characters) into the input box to instantly generate the Base64 string.
- Decode Mode: Switch to decode mode and paste a Base64 string to translate it back into human-readable text.
- Swap: Use the Swap button to instantly flip your output over to the input box and reverse the conversion mode.
Frequently Asked Questions
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It is commonly used to encode data so it can be safely transmitted over media that are designed to deal with text (like HTML, CSS, or JSON).
Is Base64 a form of encryption?
No. Base64 is not encryption. It does not use a key and provides no security. Anyone with a Base64 decoder can easily read your data. Never use Base64 to secure passwords or sensitive data.
Does this tool send my data to a server?
Absolutely not. Our Base64 tool runs entirely using your browser's built-in JavaScript functions (btoa and atob). Your data is never transmitted over the internet.
Does it support UTF-8 characters?
Yes! While standard Base64 functions often fail on special characters (like emojis or accents), our tool uses a special URI encoding step to safely support all UTF-8 characters.