Free & Instant
Base64 Decoder
Decode Base64 encoded text back into readable plain text instantly.
Base64 Decoder
Paste Base64 encoded text below to decode it.
Invalid Base64 string — please check your input.
What Is Base64 Decoding?
Base64 decoding reverses the encoding process, converting Base64 formatted text back into its original readable form — commonly used when reading encoded API responses, email attachments, or embedded data.
Frequently Asked Questions
Why do I get an "invalid" error?+
This happens if the pasted text isn't valid Base64 — check for missing characters, extra spaces, or that you copied the complete encoded string.
Is my data sent anywhere when I decode it?+
No, all decoding happens directly in your browser using JavaScript. Your data is never sent to or stored on any server.