Base64URL Encoder Decoder
Encode plain text to Base64URL, decode URL-safe Base64 values, or inspect JWT payload segments in your browser.
Result
Privacy Note
Encoding and decoding happens locally in your browser. Your JWT parts, API values, authentication text, and encoded strings are not uploaded by this tool. Still, avoid pasting live secrets into any tool unless you understand the risk.
Encoding Base64URL Strings for JWTs and URLs
Base64URL is a URL-safe form of Base64. It is commonly used in JWTs, OAuth flows, API payloads, signed URLs, and other web systems where encoded values may appear inside headers, query strings, or tokens.
Standard Base64 can contain +, /, and=. Base64URL replaces + with -, replaces / with _, and often removes the padding at the end.
This tool is useful for formatting and debugging encoded text. It does not decrypt data, verify JWT signatures, or decide whether a token should be trusted.
How to Use the Base64URL Encoder Decoder
- Paste plain text, a Base64URL value, or a compact JWT.
- Use Encode Base64URL for plain text.
- Use Decode Base64URL for a single encoded value.
- Use Decode JWT Payload when you pasted a full JWT.
- Copy the result only after checking that it is safe for your workflow.
Common Use Cases
- Decoding a JWT header or payload segment during debugging.
- Encoding URL-safe values for API tests and documentation.
- Checking whether a token part uses Base64URL padding.
- Converting between text and JWT-style Base64URL output.
- Explaining why encoded token content is still readable.
Example Base64URL Encoding
Plain text:
Yoryantra
Base64URL encoded:
WW9yeWFudHJh
Base64URL Is Not Encryption
- Encoding is reversible: Base64URL only changes how data is represented. It does not hide the content.
- JWTs need verification: Decoding a JWT lets you inspect claims, but it does not prove the signature is valid.
- Padding can vary: Some systems keep trailing
=padding, while JWT-style values commonly remove it. - Exact bytes matter: Different text encoding, whitespace, or line endings can produce different encoded output.
Frequently Asked Questions
What is Base64URL?
Base64URL is a URL-safe Base64 variant used by JWTs and many web protocols. It avoids characters that can be awkward inside URLs.
How is Base64URL different from Base64?
Base64URL uses - and _ instead of+ and /. It also commonly removes trailing padding characters.
Can this verify a JWT token?
No. It can decode JWT text for inspection, but signature verification requires the correct key, expected algorithm, and validation rules.
Is Base64URL safe for secrets?
Not by itself. Base64URL is readable after decoding, so it should not be used as a replacement for encryption or proper secret handling.
Does this run locally?
Yes. The encode and decode operations run inside your browser.