Base64 Decoder

Base64 Decoder reverses Base64 encoding and gives you back the original text. Paste the encoded string and the decoded version appears below. Decoding is UTF-8 aware, so strings containing accented characters, non-Latin scripts and emoji come back exactly as they went in rather than as a row of question marks.

Real-world Base64 is often untidy. Strings copied from logs arrive with line breaks in them, strings from URLs use the URL-safe alphabet with hyphens and underscores, and strings from some APIs have had their padding stripped. The decoder handles all three automatically: it removes whitespace, accepts both alphabets and restores missing padding before decoding.

When a string genuinely cannot be decoded, you get a plain-language explanation rather than a raw browser exception. The most common cause is that the text was never Base64 to begin with, or that a character was lost when it was copied.

• Correct UTF-8 decoding for international text and emoji
• Accepts both standard and URL-safe alphabets
• Ignores line breaks and spaces inside the string
• Restores missing padding automatically
• Plain-language errors instead of raw exceptions
• Copy the decoded text in one click

The base64 decoder is used by writers, developers, students, marketers and anyone else who needs the job done once without installing software. Common cases include:

• Reading an encoded payload from a log file
• Inspecting the contents of a token or query parameter
• Checking what a data URI actually contains
• Debugging an API that returns Base64 fields
• Recovering text that was encoded for transport