Base64 Decode

Free online Base64 decoder to decode Base64 and Base64URL strings to readable text.

  • Runs locally in your browser
  • No data uploaded
  • Instant processing
Waiting for input

How to Use Base64 Decode

  1. Paste a Base64 or Base64URL string into the input field.
  2. The decoded text appears instantly in the output panel.
  3. Copy the decoded result for debugging or data inspection.

Example Usage

Input

SGVsbG8gd29ybGQ=

Output

Hello world

Frequently Asked Questions

Does this support Base64URL format?
Yes. Base64URL input with - and _ is supported.
What if my Base64 is invalid?
You will see a clear invalid input error message.
Do you save decoded data?
No. Everything is decoded locally in your browser.