URL-Safe Base64 Encoder/Decoder
Convert Base64 strings to URL-safe format by replacing problematic characters. Perfect for query parameters, filenames, and web APIs.
What is URL-Safe Base64?
URL-safe Base64 is a variant of standard Base64 encoding that replaces characters that have special meaning in URLs. The standard Base64 alphabet uses + and /, which are reserved characters in URLs. URL-safe Base64 replaces + with - and / with _, and typically removes padding (=).
Common Use Cases
Query Parameters: Safely pass Base64-encoded data in URL query strings without encoding issues.
JWT Tokens: JSON Web Tokens use URL-safe Base64 encoding for their header, payload, and signature components.
File Names: Create file names from Base64 data without filesystem-unsafe characters like /.
API Keys: Generate URL-safe API keys and tokens that can be transmitted in URLs.
How It Works
Encoding: The tool first converts your text to standard Base64, then replaces + with -, / with _, and removes trailing = padding characters.
Decoding: The tool reverses the process by replacing - with +, _ with /, adding padding if needed, then decoding from Base64 to text.
Privacy and Security
All encoding and decoding happens locally in your browser. Your text and Base64 data are never sent to any server. This ensures complete privacy for sensitive data like API keys, tokens, or confidential text.