What is Base64 decoding?

Base64 decoding converts Base64 encoded text back to its original form. Base64 uses 64 ASCII characters (A-Z, a-z, 0-9, +, /) to represent binary data as text. Decoding reverses this process to recover the original content.

Why does my Base64 string fail to decode?

Common reasons include invalid characters (only A-Z, a-z, 0-9, +, / are allowed), incorrect padding, or corrupted strings. Make sure your input is a complete and valid Base64 string with proper padding if needed.

What do the equal signs at the end mean?

Equal signs (=) are padding characters. Base64 encodes data in groups of 3 bytes as 4 characters. When the input length isn't a multiple of 3, padding fills the remaining space to make the output a multiple of 4 characters.

Can I decode Base64 with special characters?

Yes! This decoder properly handles Unicode output including special symbols, accented characters, and emojis. It uses UTF-8 decoding internally to ensure all characters are correctly recovered.

Is Base64 decoding reversible?

Yes, Base64 decoding is completely lossless. The decoded text is exactly identical to the original text before encoding. No data is lost or corrupted during encoding or decoding.

Can I decode JWT tokens with this tool?

JWT tokens contain Base64URL encoded segments. You can decode individual JWT segments (header, payload) using this tool, but note that JWT uses Base64URL encoding which replaces + with - and / with _. You may need to convert these characters first.

Base64 Decoder

Decode Base64 encoded text back to plain text instantly with automatic encoding detection.

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Common Base64 strings for quick decoding

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Enter Base64 encoded text to decode back to plain text.

How it works: Base64 decoding reverses the encoding process, converting Base64 characters back to the original text or binary data.

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