Chapter IV · Encoders & Crypto
Encoders & Crypto.
Base64, URL, hex, hashes, HMAC, JWT, keys and classic ciphers — all client-side, never logged.
- Tools
- 21 tools
- Sections
- 5 sections
Offline
Encoders8 tools
Ciphers2 tools
Hashes & HMAC3 tools
JWT & tokens3 tools
From the blog
Reading on this topic.
base64
Base64 encoding across 5 languages: JavaScript, Python, Go, Rust, PHP
Idiomatic Base64 and Base64URL encoding/decoding in JS, Python, Go, Rust, and PHP — with the standard-library one-liners and the gotchas each language buries.
3 min read
Base64URL vs Base64: when the extra characters matter
The + / = characters in standard Base64 break URLs, filenames, and JWT headers. Base64URL is the fix — and it's almost but not quite a drop-in replacement.
4 min read
Base64 explained: what it is, what it isn't, and when to use it
Base64 is everywhere — emails, JWTs, data URLs, certificates. Here's what it actually does, and what it doesn't (encryption!).
End of Chapter IV
Next · Chapter VGenerators