Base64 Decode

Why Use Our Base64 Decoding Tool?

Base64 decoding is the critical process of converting ASCII string data back into its original binary or text format. Developers and IT professionals rely on this standard to interpret data transmitted over channels designed to handle text, such as JSON APIs and Email headers.

Unlike server-side decoders, our tool runs entirely in your browser using JavaScript. This guarantees that your sensitive API keys, auth tokens, or private data strings are never transmitted over the internet, ensuring 100% privacy and security.

How to Decode Data

1. Paste: Insert your Base64 encoded string into the top input field.
2. Decode: Click the "Decode" button to trigger the client-side conversion.
3. Copy: The human-readable text appears immediately in the bottom box, ready for use.

Frequently Asked Questions

What is Base64 decoding used for?

It translates encoded ASCII strings back into usable binary or text data. This is essential for decoding email attachments, reading API responses, and interpreting data URIs in web development.

How do I decode a Base64 string to text?

Paste the encoded string into the input box above and press "Decode." The tool automatically processes the data using standard algorithms and displays the readable text in the output field.

Can you decode a file from a Base64 string?

Yes, theoretically. Base64 represents binary data (like images or PDFs). While this tool displays the output as text, developers can programmatically use the decoded binary stream to reconstruct files.

Is it safe to use an online Base64 decoder?

Yes. This tool processes all data locally on your device via client-side JavaScript. No data is ever uploaded to external servers, making it safe for sensitive information.

Why am I getting an "invalid Base64 string" error?

The input likely contains non-Base64 characters or incorrect padding. Ensure the string length is a multiple of four and only contains A-Z, a-z, 0-9, +, /, and = characters.