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Base64 Encoding and Decoding: Complete Developer Guide
Master Base64 encoding and decoding with practical examples. Learn when to use it, common pitfalls, and best practices for handling binary data.
Base64URL Decode
Decode Base64URL strings from JWTs and URLs to readable text
Text (Plain)
Auto-detect: paste Base64URL to decodeInput
Mode
Encoding
Base64 (Encoded)
SpacerOutput
What is Base64URL Decode?
Decode Base64URL-encoded strings back to readable text. Base64URL is the URL-safe variant used in JWT tokens, OAuth flows, and URL parameters. This tool handles the - and _ characters used in Base64URL and works with or without padding. Perfect for inspecting JWT token contents, debugging OAuth tokens, and decoding URL-safe encoded data.
How to Use
1
Paste the Base64URL-encoded string
2
The tool automatically decodes to text
3
View the decoded readable output
4
Copy the decoded text for inspection
Common Use Cases
Decode JWT token header and payload segments
Inspect Base64URL-encoded URL parameters
Debug OAuth and SAML tokens
Decode URL-safe encoded data
Extract information from encoded tokens
Key Features
Instant Base64URL decoding
Handles - and _ characters
Works with or without padding
UTF-8 character decoding support
One-click copy to clipboard
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