Free Online Base64 Encoder / Decoder
Instantly encode text to Base64 or decode Base64 back to its original format.
What is Base64 Encoding?
Base64 is a method of encoding binary data into a standard ASCII string format. This makes it possible to safely transmit data that might otherwise be corrupted, or to embed files directly into text-based formats like HTML or CSS.
It is not a form of encryption, as it can be easily reversed (decoded). This tool provides a simple and instant way to perform both encoding (text to Base64) and decoding (Base64 to text).
Key Features
Dual-Mode Operation
Easily switch between encoding text to Base64 and decoding Base64 back to text with a simple radio button.
Instant Conversion
All conversions happen instantly in your browser, providing immediate results with no server lag.
Full-Featured Editor
Both input and output boxes include convenient buttons to Copy, Paste, Upload a file, and Clear the content.
UTF-8 Support
Correctly handles international and special characters (UTF-8) during both encoding and decoding.
Secure & Private
Your data is never sent to our servers. All operations are performed locally in your browser for 100% privacy.
File Support
Easily upload the content of a `.txt` file directly into either the input or output box.
Base64 Converter
How to Use
Select Mode
Choose whether you want to "Encode" (Text to Base64) or "Decode" (Base64 to Text).
Enter Your Data
Paste, type, or upload your text or Base64 string into the input box.
Click "Convert"
Press the button to instantly perform the selected conversion.
Get the Result
The converted output will appear in the result box, ready to be copied.
Use Cases
Embedding Images
Developers use Base64 to embed small images directly into HTML or CSS files, reducing the number of server requests.
Email Attachments
Base64 is a core part of how email systems encode attachments to be sent safely within the text-based email format.
Data Transfer
It's used in APIs and data formats like JSON to ensure that complex data is transmitted as a simple, safe string.
Ready to Encode or Decode?
Paste your data into the converter above for an instant, secure conversion!
Start Converting NowFrequently Asked Questions
Is Base64 a form of encryption?
No. Base64 is an encoding scheme, not an encryption algorithm. It is easily reversible by anyone, so it should **never** be used to protect sensitive data. Its purpose is to ensure data integrity during transmission, not to provide confidentiality.
Is this tool free and private?
Yes, absolutely. This tool is 100% free to use. All encoding and decoding operations happen entirely within your web browser. Your data is **never sent to our servers**, ensuring it is completely private and secure.
Does this tool send my data to a server?
No. All encoding and decoding operations happen entirely within your browser using JavaScript. Your data is never sent to our server, making this tool fast, secure, and completely private.
What happens if I try to decode an invalid string?
If you enter text that is not a valid Base64 string and try to decode it, our tool will show an "Error: Invalid Base64 String" message. A valid Base64 string only contains uppercase letters (A-Z), lowercase letters (a-z), numbers (0-9), and the `+`, `/`, and `=` characters.
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Conclusion
Our Free Base64 Encoder/Decoder is an essential utility for any developer. By providing a fast, secure, and fully client-side solution for Base64 conversions, it simplifies a common but critical task. With a user-friendly interface and convenient helper tools for both input and output, it streamlines your workflow and ensures your data is always correctly formatted for transmission or embedding.
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