Base64 Decoder
Decode Base64 back to plain text.
About Base64 Decoder
Decode Base64 strings back into readable text instantly and privately. Base64 is an encoding scheme that represents binary data using a 64-character alphabet, and it shows up constantly in email attachments, data URIs, JSON Web Tokens, API responses, and configuration files. This decoder takes any Base64 input and reverses it into the original plain text so you can inspect what a value actually contains. Because the conversion runs entirely in your browser, the data you paste is never uploaded or logged, which makes it safe for decoding tokens and other sensitive strings while you debug.
How to use this tool
- 1Paste the Base64 string you want to decode.
- 2The decoded text updates automatically.
- 3Click Copy to copy the result.
Frequently asked questions
Why do I get an error decoding?
The input may not be valid Base64. Check for missing padding, spaces, or non-Base64 characters.
Is decoding done privately?
Yes, everything runs locally in your browser and nothing is sent to a server.
Related guide
5 min readBase64 Explained: What It Is, What It Isn't, and When to Use It
Why Base64 exists, how the encoding actually works, why it isn't encryption, and the real-world cases where you'd use it - or shouldn't.