What is Base64 Decode?

A tool that converts Base64-encoded text back to its original format. Easily decode data from API responses, email data, file transfers, and more.

Conversion results appear in real-time as you type.

How to Use

Paste your Base64-encoded string into the input area and see the decoded result automatically. Use the copy button to save the decoded result to your clipboard.

Decode by Line

Convenient option for processing multiple lines of Base64 data.

• Enabled - Each line is processed as independent data and decoded separately
• Disabled - The entire input is processed as a single piece of data

Use Cases

• API response analysis - Check Base64-encoded JSON data and more
• Email data reading - Decode MIME-encoded email content
• Data transfer verification - Check contents of encoded file data
• Log file analysis - Batch process multiple Base64-encoded lines

Usage Examples

Decoding an API Response

eyJuYW1lIjoiSm9obiBEb2UiLCJlbWFpbCI6ImpvaG5AZXhhbXBsZS5jb20iLCJyb2xlIjoiYWRtaW4ifQ==

Decoded result:

{ "name": "John Doe", "email": "john@example.com", "role": "admin" }

Decoding Multiple Lines

Enable "Decode by Line" and enter:

SGVsbG8gV29ybGQh
V2ViIFRvb2xCb3g=
QmFzZTY0IGRlY29kZXI=

Decoded result:

Hello World!
Web ToolBox
Base64 decoder

About Base64

Base64 is an encoding scheme that converts binary data into ASCII strings. This allows binary data to be transmitted over protocols that can only handle text.

Common uses:

• Email attachments (MIME format)
• Data URI schemes
• Binary data in JSON
• Certificate and token encoding (JWT)