Decode Base64 encoded strings to plain text instantly. Our free online Base64 decoder tool converts Base64 encoded data back to its original format. Perfect for developers working with APIs, data encoding, or debugging encoded strings. No installation required - works entirely in your browser.
Simply paste your Base64 encoded string into the input field. The tool will automatically decode it when you click the 'Decode' button or when you leave the input field. Copy the decoded result to use in your application.
Many APIs return Base64 encoded data. Use this tool to decode the response: 'SGVsbG8gV29ybGQ=' decodes to 'Hello World'.
Base64 encoded images can be decoded to view the original data. This is useful when working with data URIs or embedded images.
When debugging applications that use Base64 encoding, paste the encoded string here to quickly see the original content.
Decode Base64 encoded responses from REST APIs or web services to inspect the actual data being transmitted.
Process Base64 encoded data from databases, configuration files, or other sources that use Base64 encoding.
Decode Base64 encoded strings found in logs, error messages, or security reports to understand their content.
Decode Base64 encoded data URIs, cookies, or session data used in web applications.
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 deal with textual data.
Yes! This tool runs entirely in your browser. Your data is never sent to our servers - all decoding happens locally on your device.
The tool can handle reasonably sized Base64 strings. For very large files, consider using a desktop application or command-line tool.
If you see an 'Invalid Base64 string' error, check that your input is properly formatted Base64. Make sure there are no extra spaces or characters, and that the string length is a multiple of 4.