Encoding & Number Bases
URL-Safe Base64 Converter
Convert between standard Base64 and URL-safe Base64 (base64url).
Loading tool…
What is URL-Safe B64?
Base64url is Base64 with + replaced by -, / replaced by _, and no = padding, designed for safe inclusion in URLs, filenames, and JWT tokens.
How it works
We transcode between the two formats by replacing the alphabet characters and optionally stripping/appending padding.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Type or paste any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.