Encoding & hashing

12 tools in this category

Encode, hash, and inspect tokens without a backend.

Base64, JWTs, HMAC, UUID, and more — each runs via Web Crypto or pure JS, which means no accidental logging of the strings you are testing. Ideal for CTFs, on-call, or classroom demos where students should not paste into random SaaS dashboards.

Base64 encode / decode

Encode or decode Base64 text and small files.

URL encode / decode

Percent-encode or decode URL components.

HTML entity encode / decode

Escape or unescape HTML entities.

JWT decode / inspect

Inspect JWT header and payload (client-side).

Hash generator

MD5, SHA-1, SHA-256, SHA-512 via Web Crypto.

RSA key pair generator

Generate RSA-2048 public and private keys in PEM format in your browser.

HMAC generator

Compute HMAC-SHA1/256/384/512 with a secret key using Web Crypto.

Bcrypt hash & verify

Hash passwords and verify bcrypt strings with bcryptjs in your browser.

Basic auth header generator

Build Authorization: Basic … and curl -u examples from a username and password.

UUID / ULID generator

Generate UUID v4 and ULIDs in bulk.

Unix timestamp converter

Convert between epoch seconds and local time.

Number base converter

Convert between binary, octal, decimal, and hex.