Base64 Decoder
Decode any Base64 string back to plain text instantly. Free, no signup.
How to use this tool
- Enter base64 to decode in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your decoded text and the full breakdown beneath it.
Base64 Decode converts a Base64-encoded string back into its original text form.
Frequently asked questions
- Why does Base64 decoding fail?
- Decoding fails when the input contains characters outside the Base64 alphabet or has incorrect padding. Ensure the string ends with the right number of '=' characters.