Base64 Decode
Decode standard Base64 back to UTF-8 text in your browser.
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Decoding Base64 reverses the encoding step that protected binary or non-ASCII data through ASCII-only transports. Converterzilla's decoder reads any standard Base64 string (with or without padding) and emits the original UTF-8 text. Invalid input is flagged immediately with a clear error message.
How to use Base64 Decoder in your browser
- Paste Base64. Drop the encoded string into the input panel.
- Read decoded text. If the bytes are valid UTF-8, you'll see the text; otherwise an error explains.
- Copy or download. Use the buttons to grab the result.
Why use Converterzilla for Base64 Decoder
Tolerant of whitespace
Line breaks and spaces in Base64 are stripped automatically — many tools emit wrapped output.
UTF-8 aware
We decode bytes then interpret as UTF-8; emoji, Chinese, Arabic all come back intact.
Local only
Decoding secrets locally is safer than pasting them into an online tool that logs requests.
Frequently asked questions about Base64 Decoder
Almost always a missing pad ('=') or a '+' that got URL-encoded to '%2B'. URL-decode first.
Yes — we normalise '-' to '+' and '_' to '/' before decoding.
The original bytes likely aren't UTF-8 (e.g., a binary file). Decoded text only makes sense if the source was text.