Base64 Decoder
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Formula: atob(base64text)
Base64 Decoder
Base64 decoding reverses the encoding process, converting Base64 text back to its original binary or text form.
Conversion Formula
atob(base64text)
Every 4 Base64 characters are decoded back to 3 bytes of original data.
Step-by-Step Examples
SGVsbG8gV29ybGQ= = Hello World
Standard Base64 decoding
Frequently Asked Questions
How do I decode Base64?
Paste the Base64 string into the input. The decoder converts it back to the original text.
Why might Base64 decoding fail?
The input may contain invalid characters or have incorrect padding. Base64 strings should only contain A-Z, a-z, 0-9, +, /, and = padding.