Base64 Encoder Decoder
Convert text to Base64 or decode Base64 back to plain UTF-8 text with fast local processing.
Input
Output
When to Use Base64 Conversion
Base64 is widely used when binary content or special characters must pass through text-only channels. Common examples include API credentials, inline assets, and platform metadata that expects ASCII-safe payloads.
This encoder/decoder is helpful during testing and incident response. You can quickly inspect unknown payloads, verify encoded values, and reduce mistakes before updating configuration files or integration scripts.
FAQ
What is Base64 used for?
Base64 converts binary or text data into ASCII-safe text so it can travel through systems that expect plain text.
Does this tool support non-English text?
Yes. UTF-8 encoding and decoding are handled so Unicode characters are preserved.
Can I decode JWT payload fragments with this tool?
Yes for plain Base64 strings. JWT often uses Base64URL, so replace URL-safe characters if needed before decoding.
Is data sent to a backend service?
No. All Base64 conversion happens locally in your browser session.
Why do I get an invalid Base64 error?
The input may include unsupported characters, missing padding, or be in Base64URL format instead of standard Base64.