How Base64URL differs from Base64
Base64URL swaps `+` and `/` for `-` and `_`, which makes it safer inside URLs and tokens.
It also often drops padding, which is why copied JWT segments don't always decode cleanly in a plain Base64 tool.
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Base64URL Encode / Decode
Encode text to Base64URL or decode URL-safe Base64 back into readable UTF-8 text for JWT, callbacks, and transport-safe payloads.
Base64URL replaces + and / with URL-safe characters and usually omits trailing padding.
FAQ
Is this Base64URL tool free?
Yes.
What is the difference between Base64 and Base64URL?
Base64URL uses URL-safe characters and often removes trailing padding, which makes it common in JWTs and callback flows.
Is my input uploaded?
No. Encoding and decoding happen locally.
Can I decode JWT segments with this?
Yes. It works well for JWT header and payload segments.
Does Base64URL always include padding?
No. Many systems omit trailing equals signs, so decoders often need to normalize the input first.
Should I use Base64URL for regular files?
Only if the encoded value needs to be URL-safe. For general transport outside URLs, standard Base64 is usually enough.
How To Use It
Where developers use Base64URL
JWT headers and payloads use Base64URL, and you'll also see it in signed links and callback parameters.
It's the safer choice when an encoded value has to survive query strings, routers, and middleware without getting mangled.
Why decoding sometimes fails
A lot of Base64URL strings get copied out of tokens, cookies, or links after padding has already been stripped.
Normalizing them first helps you tell whether the problem is just formatting or whether the source value is actually broken.
Related Tools
Related Tutorials
Base64 Encoding: A Comprehensive Developer Guide with Examples
Learn how Base64 works, when to use it, common pitfalls, and the crucial difference between Base64 and Base64URL with practical examples.
How to Decode a JWT: A Comprehensive Step-by-Step Tutorial
Learn what a JWT is, how to decode one, what each part means, and real-world debugging tips from production experience.
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