Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 to plain text instantly with our free online Base64 encoder/decoder. All processing happens in your browser.

Input Text

Output

Base64 Encoder / Decoder FAQ

What is Base64 encoding?

Base64 is a binary-to-text encoding scheme that converts binary data into ASCII string format. It's commonly used to encode data for transmission over media designed to handle text, such as email or JSON.

When should I use Base64 encoding?

Base64 is used when you need to transmit binary data over text-based protocols like HTTP, email, or JSON. It's also used for encoding images in CSS or HTML, storing credentials, and embedding data in URLs.

Is Base64 encryption?

No, Base64 is not encryption. It's an encoding method that makes binary data text-safe for transmission. Anyone can easily decode Base64 strings, so never use it to protect sensitive information.

Why does Base64 increase data size?

Base64 encoding increases data size by approximately 33% because it uses 6 bits per character instead of 8 bits. This overhead is the trade-off for making binary data text-safe.

Can I decode any Base64 string?

Yes, any valid Base64 string can be decoded back to its original content. Invalid Base64 strings will produce an error. This tool automatically detects and handles invalid input.

Is this Base64 tool secure?

Yes, all encoding and decoding happens entirely in your browser. Your data never leaves your device or gets sent to any server, ensuring complete privacy.