What is Base64 Decoding?
Base64 decoding is the reverse process of Base64 encoding — it converts Base64 encoded ASCII text back into its original binary or text form. This is essential when you receive Base64 encoded data and need to read or use the original content.
A valid Base64 string contains only characters from the set A-Z, a-z, 0-9, +, /, and may end with one or two '=' padding characters. The decoder strips whitespace automatically for convenience.
How to Use Base64 Decoder?
- Paste your Base64 string in the input panel on the left.
- The text is decoded automatically as you type — no button click needed.
- Copy the decoded output to your clipboard or Save it as a text file.
- Click Sample to load an example Base64 string for testing.
Common Use Cases
🔓 Decode API Responses
Decode Base64 encoded payloads from REST APIs and webhooks.
🔑 JWT Inspection
Decode JWT token payloads to inspect claims and expiration.
📧 Email Headers
Decode MIME-encoded email headers and content.
🐛 Debugging
Decode encoded strings during debugging to see the original data.