Base64URL Safe Converter
Encoding • 100% Client-Side Processing
RFC 4648 Base64URL encoder and decoder. Replaces + with - and / with _, omitting = padding for safe use in URLs, query strings, and JWTs.
Privacy First: Base64URL Safe Converter executes 100% locally in your web browser. No inputs or generated outputs leave your device.
Zero Server TransmissionTool Chaining — Continue Workflow
Take your result from Base64URL Safe Converter directly into companion utilities:
How to Use
- Enter string.
- Choose Encode to Base64URL or Decode.
- Copy converted output.
Key Features
- •RFC 4648 compliance
- •Replaces + with - and / with _
- •Handles missing = padding automatically
Technical Scope & Limitations
- • Strictly designed for web transmission; differs from standard MIME Base64.