Developer Tools
Base64 Decoder
Decode a Base64-encoded string back into readable, original text, instantly.
🔒 Runs in your browser. Processing behavior depends on the specific tool and its documented implementation.
Ready.
About this base64 decoder
When you encounter a Base64-encoded string, in a URL, a config file, or an API response, this tool reveals the original text behind it immediately.
How base64 decoder works
The Base64 string is decoded back into its original byte sequence and displayed as text using the standard Base64 decoding algorithm.
Common uses
- Reading the actual content of a Base64-encoded API token or value
- Decoding a data URL back to readable text
- Debugging an encoded config or environment variable
How to use this tool
- Paste the Base64 string.
- Click Process.
- See the decoded original text.
What to know before using it
Requires a validly formatted Base64 string as input, malformed input will fail to decode cleanly.
Privacy and browser-first processing
Your text is decoded entirely in your browser and is never uploaded or stored.
Frequently asked questions
Why did decoding fail?
The input needs to be valid Base64, check for missing characters or extra whitespace that may have been accidentally included when copying it.