Why does Base64 decoding fail with an error?

Decoding errors occur if the input contains invalid non-Base64 characters, incorrect padding length, or truncated bytes.

Does this tool support emojis and multilingual characters?

Yes. Our decoder natively parses UTF-8 byte streams, ensuring non-ASCII alphabets, accented letters, and emojis render properly.

Base64 Decode

Try the free Base64 Decode tool in the Encoding category provided by WebToolBox right in your browser. Process your tasks quickly and securely without any installation.

Input

Output

What is Base64 Decoding?

Base64 Decoding is the inverse process of Base64 encoding, reconstructing the original plain text or binary payload from a radix-64 ASCII string.

It validates character sets, strips optional whitespace, processes padding characters ('='), and converts 6-bit representations back into standard 8-bit bytes.

This tool supports complete UTF-8 character decoding, allowing international multilingual text and symbols to be restored without corrupting characters.

How to Use

Paste the Base64-encoded string into the input box.
The decoded plain text appears automatically in real time.
Click 'Copy' to copy the decoded content.
Use 'Sample' to quickly test with a sample encoded string.

FAQ

Why does Base64 decoding fail with an error?: Decoding errors occur if the input contains invalid non-Base64 characters, incorrect padding length, or truncated bytes.
Does this tool support emojis and multilingual characters?: Yes. Our decoder natively parses UTF-8 byte streams, ensuring non-ASCII alphabets, accented letters, and emojis render properly.

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