Online Base64 Decoder
Decode Base64-encoded strings to readable text or raw bytes instantly. CyberNexus Decoder runs entirely in your browser, so even sensitive malware payloads never leave your machine. It also auto-detects nested encodings and decodes multiple layers in one click.
Open the base64 decoder tool →How to use the base64 decoder
- Paste your Base64 string into the input panel.
- CyberNexus Decoder auto-detects the encoding and suggests the "From Base64" recipe.
- View the decoded plaintext, or switch to the Hex viewer for binary payloads.
- Chain more operations (XOR, Gunzip, PowerShell deobfuscation) to peel back additional layers.
Features
- Decodes standard Base64 and URL-safe Base64URL (- and _).
- Handles PowerShell -EncodedCommand (UTF-16LE) payloads.
- Detects when Base64 decodes to a PE executable (MZ header).
- Recursive auto-detect for multi-layer encodings.
Frequently asked questions
How do I decode a Base64 string online?
Paste the Base64 text into the input panel and apply the From Base64 operation. The decoded result appears instantly as plaintext or hex.
Is the Base64 decoder safe for malware samples?
Yes. All decoding happens locally in your browser. Nothing is uploaded to a server, so sensitive payloads stay private.