Base64 Decode

Paste any Base64 string and get the original text back instantly. The decoder accepts both the standard and URL-safe alphabets, tolerates missing padding and stray whitespace, and interprets the bytes as UTF-8 so accented characters and emoji come through intact. All decoding happens in your browser.

• Decode standard and URL-safe Base64 without switching modes
• Tolerant parsing: ignores line breaks and fixes missing = padding
• UTF-8 aware output so multi-byte text decodes correctly
• Optional data: URL stripping to decode the payload of an inline asset
• Clear, inline errors for invalid or truncated Base64
• Live decoding as you type, with one-click copy of the result

1. 1

   Paste your Base64

   Drop in a standard or URL-safe Base64 string. Whitespace, newlines, and a leading data: URL prefix are handled automatically.

2. 2

   Read the decoded text

   The original text appears immediately, decoded as UTF-8. If the input is not valid Base64, a clear error explains why.

3. 3

   Copy the result

   Copy the decoded output to reuse it elsewhere - in a request body, a config value, or your editor.

• Inspecting Base64-encoded payloads found in logs or API responses
• Reading the contents of a data: URL
• Decoding the header or payload segment of a JWT by hand
• Recovering config values that were stored in Base64
• Debugging encoding issues where text arrives garbled