Base64 Decoder
Decode Base64 strings back to plain text. Handles standard and URL-safe Base64. 100% browser-based.
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Frequently Asked Questions
What is URL-safe Base64?
URL-safe Base64 replaces + with - and / with _ so the string can be used in URLs without percent-encoding. This decoder handles both standard and URL-safe variants automatically.
Why do I get garbage output?
Make sure the input is valid Base64. Extra whitespace, line breaks, or non-Base64 characters will cause errors. The decoder strips whitespace automatically.
About Base64 Decoder
This tool decodes both standard Base64 (RFC 4648) and URL-safe Base64. Padding (=) is optional. Whitespace is stripped automatically before decoding.