•8 min read
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 Encode
Encode text to URL-safe Base64URL format for JWTs and URLs
Text (Plain)
Auto-detect: paste text to encodeInput
Mode
Encoding
Base64 (Encoded)
SpacerOutput
What is Base64URL Encode?
Encode text to Base64URL format, a URL-safe variant of Base64 used in JWTs (JSON Web Tokens), URLs, and filenames. Base64URL replaces + with - and / with _ to avoid issues in URLs and file systems. This format is essential for creating JWT tokens, URL parameters, and any Base64 data that needs to be URL-safe.
How to Use
1
Paste or type the text you want to encode
2
The tool encodes to Base64URL format
3
Copy the URL-safe Base64URL output
4
Use in JWTs, URLs, or filenames safely
Common Use Cases
Create JWT token segments (header and payload)
Encode data for URL query parameters
Generate URL-safe tokens and identifiers
Create safe filenames from encoded data
Encode data for OAuth and SAML flows
Key Features
Instant Base64URL encoding
URL-safe output (- and _ instead of + and /)
UTF-8 character encoding support
Optional padding control
One-click copy to clipboard
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