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Base64URL to Base64

Convert Base64URL to standard Base64 format. Transform URL-safe encoding to regular Base64.

Base64URL to Base64

Convert URL-safe to standard encoding

URL-Safe
-_no =
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Standard
+/=
0 characters
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Conversion Steps

1

Replace Hyphens

- → +

2

Replace Underscores

_ → /

3

Add Padding

Append = to make length multiple of 4

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Standard Base64 is needed for most programming language decoders and legacy systems.

About Base64URL to Base64

This tool converts URL-safe Base64 (Base64URL) back to standard Base64 encoding. The conversion is necessary when you need to use Base64URL data with libraries or systems that expect standard Base64 format.

  • Required for decoding JWT tokens in some libraries
  • Needed for legacy system compatibility
  • Restores standard Base64 characters (+, /, =)
  • Automatically calculates required padding
  • All processing happens locally in your browser