Base64
Encode or decode UTF-8 text and data URIs both ways, instantly.
Encode / Decode
Base64, URL & JWT Encoder and Decoder
Use one browser-native toolkit to encode and decode Base64 and URL strings, decode JWT tokens, and generate SHA hashes without sending anything to a server.
- Base64 and URL, both ways
- JWT header and payload
- SHA hashes
- Runs in your browser
What's inside
Four everyday utilities, one tab.
URL
Encode and decode query strings and components without escaping mistakes.
JWT decode
Read a token's header and payload, with issued/expiry times surfaced.
Hashes
Generate SHA-1, SHA-256, and SHA-512 digests with the Web Crypto API.
Everyday encoding utilities in one place
Use one browser-native toolkit to encode and decode Base64 and URL strings, decode JWT tokens, and generate SHA hashes without sending anything to a server.
Why use it
Why use this encode/decode toolkit
Encode or decode Base64 (UTF-8 safe) and data both directions instantly.
URL-encode and decode query strings without escaping mistakes.
Decode a JWT to inspect its header and payload, with expiry surfaced.
Generate SHA-1, SHA-256, and SHA-512 hashes with the Web Crypto API.
How it works
How to encode and decode in the browser
- 1
Pick Base64, URL, JWT, or Hash.
- 2
Paste your text or token and read the result instantly.
- 3
Copy the output — nothing is uploaded anywhere.
Use cases
Encode/decode use cases
- Decode a JWT to debug auth during development.
- Base64-encode a small asset or credential for a config.
- URL-encode a query parameter safely.
- Generate a SHA-256 checksum of a string.
FAQ
Encode/decode questions
Is my data uploaded?
No. Encoding, decoding, JWT parsing, and hashing all run locally in your browser.
Does the JWT tool verify signatures?
No — it decodes the header and payload for inspection. It does not verify the signature.
Which hash algorithms are supported?
SHA-1, SHA-256, and SHA-512, computed with the browser's Web Crypto API.
Is Base64 UTF-8 safe?
Yes. Encoding and decoding handle full UTF-8 text, not just ASCII.