Base64URL Encoder Online
Encode text using URL-safe Base64 (Base64URL) online. Generate URL-safe encoded strings without +, /, or = characters per RFC 4648.
Input
Click to upload or drag and drop
Images, PDFs, text files, JSON, etc.
32 characters
About This Tool
Mode: encode
URL-Safe: Yes
Base64 encoding converts binary data to ASCII text, making it safe for text-based systems like JSON, XML, and URLs.
Base64 Output
Enter text to see the Base64 encoded result here.
Frequently Asked Questions
What is Base64URL encoding?
Base64URL is a URL-safe variant of Base64 defined in RFC 4648. It replaces + with -, / with _, and typically omits padding (=) characters.
When should I use Base64URL instead of Base64?
Use Base64URL when the encoded data will be used in URLs, query parameters, filenames, or any context where + and / characters could cause issues.
Is Base64URL used in JWT tokens?
Yes! JWT (JSON Web Tokens) use Base64URL encoding for the header, payload, and signature parts to ensure URL safety.
Can Base64URL encoded strings be decoded by standard decoders?
Most modern decoders handle both formats. Our decoder automatically converts Base64URL to standard Base64 before decoding.
Practical Examples
JWT Token Creation
Encode JWT header and payload sections using URL-safe Base64.
OAuth State Parameter
Safely encode state data for OAuth callback URLs.
Filename Encoding
Create URL and filesystem-safe encoded filenames.
Common Issues & Solutions
Base64URL output will not contain +, /, or = characters.
The output may be slightly shorter due to omitted padding.
Some systems require padding - add = characters to make length a multiple of 4.
URL-safe and standard Base64 can be freely converted between each other.