Base64 Decoder
Decode Base64 strings back to plain text instantly. Full UTF-8 support — nothing ever leaves your browser.
This tool runs entirely in your browser. No data is ever sent to any server.
Base64 Decoding FAQ
What is Base64 decoding?
Base64 decoding reverses the encoding process, converting Base64-encoded text back into its original binary or text form. It reads groups of 4 Base64 characters and converts them back to 3 bytes of data.
What does invalid Base64 input mean?
Invalid Base64 errors occur when the input contains characters outside the Base64 alphabet (A-Z, a-z, 0-9, +, /), has incorrect padding (=), or has a length that is not a multiple of 4. URL-safe Base64 may use - and _ instead of + and /.
Can I decode Base64 images?
This tool decodes Base64 to text. For Base64-encoded images (data URIs), copy just the Base64 portion after the comma in a data URI (e.g., after "data:image/png;base64,") and decode it to get the raw binary data.
Is Base64 decoding safe?
Decoding itself is safe — it simply reverses the encoding. However, be cautious with the decoded content. Never execute decoded Base64 as code without proper validation, as it could contain malicious payloads.
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