Base64 Url Encoder Decoder
Encode and decode base64url strings for tokens, payloads, and compact IDs.
What the Base64 Url Encoder Decoder does
Encode and decode base64url strings for tokens, payloads, and compact IDs. A JWT segment can be decoded after replacing URL-safe characters and padding Adjust the controls and the preview updates immediately, so you can dial in exactly what you want and copy the result straight into your project — no build step and no account.
One thing to keep in mind: Decoding a token does not verify its signature or trustworthiness.
Private and in your browser
Everything runs locally in your browser. Your input is never uploaded, so the tool stays fast and works offline, and the copy and download buttons always use the current result shown in the output panel.
Frequently Asked Questions
What does the Base64 Url Encoder Decoder do?
Encode and decode base64url strings for tokens, payloads, and compact IDs. A JWT segment can be decoded after replacing URL-safe characters and padding.
What should I keep in mind?
Decoding a token does not verify its signature or trustworthiness
Does it upload my input?
No. The Base64 Url Encoder Decoder runs entirely in your browser — your input is never uploaded, and it keeps working offline once the page has loaded.
Practical utilities for front-end design and implementation work.