How to Decode Base64 Online
Decode any Base64 string back to plain text instantly. Free, private, and runs entirely in your browser.
Steps
Open the Base64 Encoder
Navigate to the Base64 Encoder tool and switch to the Decode mode.
Paste the Base64 string
Paste the Base64-encoded string into the input area. The tool accepts standard and URL-safe Base64 variants.
View the decoded text
The decoded plain text appears instantly. If the input is invalid Base64, an error message explains the issue.
When to Decode Base64
You may encounter Base64 strings in API responses, JWT tokens, email headers, or data URIs. Decoding them reveals the original content, which is essential for debugging, inspecting tokens, or extracting embedded data.
Frequently Asked Questions
Yes. The decoder recognizes both standard Base64 (using + and /) and URL-safe Base64 (using - and _).
This usually means the original data was binary (like an image), not text. The decoder displays raw bytes as text, which may not be human-readable for non-text data.