1. Paste Base64 String
Enter the Base64 or Base64url encoded string into the input textarea.
Base64 Decoder
Output
Note
Tools:
Base64 Decoder
Base64 Decoder
Processing...
Input
Output
Base64 Decoder is a free browser-based developer utility by ToolPix. All formatting, validation, and encoding tasks run 100% locally in client-side memory via JavaScript and WebAssembly — your source code, tokens, and data are never uploaded or stored on any server.
Quick Steps
2. Click Decode
Click the Decode button to decode the string to readable UTF-8 text.
3. Copy the Result
Use the Copy button to copy the decoded text to your clipboard.
FAQ
Does this tool handle Base64url encoding?
Yes, it automatically detects Base64url characters (- and _) and normalizes them for correct decoding alongside standard Base64.
Does it validate Base64 padding?
The tool attempts to decode the input and automatically adds missing padding. It reports an error if the input contains invalid Base64 characters.
What if the decoded result is binary data?
If the decoded bytes are not valid UTF-8 text, the output will show a warning indicating the result contains binary data.
Is my Base64 data uploaded to a server?
No. All decoding happens locally in your browser. Your data never leaves your device, ensuring 100% privacy.
Is this Base64 decoder tool free?
Yes, this Base64 decoder is completely free to use with no sign-up required. Decode unlimited Base64 strings.
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