Is Base64 decoding the same as decryption?
No. Base64 is encoding, not encryption. Decoding it does not require a key or password — anyone with the Base64 string can decode it instantly.
Base64 Decoder converts any Base64-encoded string back into the original readable text or binary data. Developers use this tool to inspect encoded API responses, decode Basic Auth header credentials during debugging, read Base64-encoded environment variables in CI/CD systems, and examine the decoded content of JWT token segments. Paste your Base64 string and get the human-readable result instantly — no server upload.
Base64 decoding reverses the encoding by converting each group of 4 Base64 characters back into 3 bytes of original data. The tool uses the browser's native atob() function with UTF-8 support to correctly handle Unicode characters in the decoded output.
No. Base64 is encoding, not encryption. Decoding it does not require a key or password — anyone with the Base64 string can decode it instantly.
Copy the value after "Basic " in the Authorization header and paste it here. The decoded output will show username:password in plain text.
Invalid characters, missing padding (=), or line breaks can cause decoding to fail. Make sure you are pasting the complete, unmodified Base64 string.
No. Decoding runs entirely in your browser using the built-in atob() function. Nothing leaves your device.
Use the Base64URL Decoder tool for JWT segments. Standard Base64 and Base64URL use slightly different character sets and padding rules.
Yes, completely free. No login or sign-up required.
Tool workspace
Free Base64 decoder online — instantly decode Base64 strings back to readable text or original data. Perfect for inspecting API responses, auth headers, and JWT segments. No login.
Output
Input
YWRtaW46cGFzc3dvcmQxMjM=
Output
admin:password123