Base64 Decoder
Decode Base64 back to UTF-8 text locally.
Your input stays in your browser. Nothing is uploaded.
Input
Output
About this tool
Base64 Decoder: Decode Base64 back to UTF-8 text locally. Nothing is uploaded to SmartKitio. Review the output before you rely on it for production or legal use.
How it works
Paste a Base64 string and decode. If the alphabet is wrong, you will see an error message.
UTF-8 decode(atob(input))
Examples
SGVsbG8=
Decodes to Hello.
FAQ
URL-safe Base64?
Replace - with + and _ with / first, or use the JWT decoder for tokens.
Is my data uploaded?
No. Formatting, encoding, and generation run in your browser.
Can I use this offline after the page loads?
Yes, as long as the page stays open. Nothing is sent to a SmartKitio API.