Base64 URL-Safe Encoder
Securely encode and decode data for use in URLs and JWT tokens. This variant of Base64 replaces characters that have special meanings in URLs with safe alternatives.
100% Private & Secure
This tool runs completely inside your browser using client-side WebAssembly and JS. Zero data is ever sent to our servers.
What makes it URL-Safe?
Standard Base64 uses +, /, and = which have special meanings in URLs. The **URL-Safe** variant replaces them with - and _ and removes the padding, making it safe for query parameters and JWT tokens.
How to use this tool
- Type or paste your raw text into the 'Raw Text' field to encode it.
- Paste a Base64 URL-safe string into the 'Output' field to decode it back to text.
- The tool automatically swaps '+' with '-' and '/' with '_', and handles padding removal.
- Use the copy buttons to quickly grab your results for use in code or API requests.
Example Usage
Hello World!
SGVsbG8gV29ybGQh
Complex/?String+
Q29tcGxleC8_U3RyaW5nLQ
When to use this tool
- Generating URL-safe payloads for deep-linking and webhooks.
- Encoding/decoding the header and payload sections of JSON Web Tokens (JWT).
- Passing binary data through URL query parameters without encoding issues.
- Building slug-safe identifiers from raw database strings.
Frequently Asked Questions
How is this different from standard Base64?
Standard Base64 uses characters (+, /, =) that are reserved in URLs and can break navigation or tracking. The URL-Safe variant swaps them for '-' and '_' respectively, and removes trailing padding '='.
Is this safe for sensitive data?
Yes. All encoding and decoding happens locally in your browser. No data is ever sent to our servers, ensuring your strings remain private.
Why remove the padding (=)?
URL-safe Base64 often omits padding because the `=` character is used to separate query parameters in URLs. Most modern decoders can handle strings without padding automatically.
Is this the same as 'base64url' in Node.js?
Yes. This tool implements the exact RFC 4648 'base64url' standard used in modern web APIs and authentication frameworks.
Can I use this for JWT troubleshooting?
Absolutely. JWT headers and payloads are almost always encoded using Base64 URL-safe. This tool helps you manually decode those segments to verify data.
Does it support binary data?
This web version supports UTF-8 text strings. For raw binary data (like images), we recommend our specialized 'Base64 to Image' tool.