Question 1

What encoding formats are supported?

Accepted Answer

The tool supports: Base64 (standard and URL-safe), Base32, URL Encoding (percent-encoding), HTML Entities, Hexadecimal, Binary, ROT13, JWT (header/payload decoding) and MD5, SHA1, SHA256, SHA512 hashes for fingerprint verification.

Question 2

How do I decode a JWT token?

Accepted Answer

Paste your JWT token (header.payload.signature format) and select JWT mode. The tool decodes the header and payload parts into readable JSON, revealing the claims (iat, exp, sub, roles…) without verifying the cryptographic signature.

Question 3

Can this tool be used for CTF challenges?

Accepted Answer

Absolutely, that's one of its main uses. The decoder supports multi-layer encodings (Base64 within a URL-encoded string, etc.) and common CTF formats. Try different formats if the result isn't readable on the first decode.

Universal Decoder

BASE64 Converter

BASE64 Converter Clear

BASE64 Converter