Free Base64 decoder – decode Base64 strings to text instantly in your browser. Fast, private, no installation required.
Copy your Base64 encoded string and paste it into the input field above.
The tool automatically decodes your Base64 string in real-time as you type.
Click the copy button to save the decoded text to your clipboard.
Real-time Base64 decoding as you type. See results immediately without clicking any buttons.
Full support for UTF-8 encoded characters, including international text, emojis, and special characters.
Automatically detects invalid Base64 strings and provides clear error messages for debugging.
All processing happens in your browser. Your data never leaves your device.
What is Base64? Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It's commonly used to encode data that needs to be stored or transferred over media designed to handle text.
How Base64 Works: Base64 encoding converts binary data into a set of 64 ASCII characters (A-Z, a-z, 0-9, +, /). Every 3 bytes of binary data is represented by 4 Base64 characters, making it safe for transmission over text-based protocols.
UTF-8 Character Support: Our decoder fully supports UTF-8 encoded characters, allowing you to decode Base64 strings containing text from any language, including Chinese, Japanese, Arabic, and emoji characters.
Decode Base64 encoded data in API responses, especially for binary data like images or files.
Extract and decode Base64 data from data URIs used for embedding images and files in HTML/CSS.
Decode JWT (JSON Web Token) payloads which are Base64 encoded for authentication and authorization.
Decode Base64 encoded email attachments and MIME content for debugging and analysis.
Base64 decoding is the process of converting Base64 encoded text back to its original form. Base64 encoding is commonly used to encode binary data (like images or files) into ASCII text format so it can be safely transmitted over text-based protocols like email or HTTP.
Simply paste your Base64 encoded string into the input field at the top of this page. Our tool automatically decodes it in real-time as you type, showing the result instantly. You can then copy the decoded result with one click. No registration or payment required.
Yes! Our decoder fully supports UTF-8 encoding, which means you can decode Base64 strings containing characters from any language including Chinese, Japanese, Korean, Arabic, emojis, and other special characters.
Absolutely. All Base64 decoding happens entirely in your browser using JavaScript. Your data never leaves your device or gets sent to any server, ensuring complete privacy and security.