Category spotlight

Crypto & Security

Ciphers, entropy labs, password and JWT utilities

Ciphers, entropy labs, password and JWT utilities. These online crypto & security run entirely in your browser and help you work with crypto & security data quickly and safely. Paste or upload your content, configure the options, and get instant results without installing extra software.

Tool catalog

Everything under Crypto & Security

Click into any card to open its dedicated `/ crypto /slug` route. Live tools render instantly, while planned ones display detailed placeholders so you can track progress.

ROT Cipher

Rotate characters by N positions

rot13, caesar cipher

Password Strength Checker

Analyze password security and get improvement suggestions

password strength, password test

Password Generator

Create secure passwords with entropy insights

password generator, random passwords

Hash Calculator

Calculate hash values using various algorithms

JWT Decoder & Validator

Inspect JSON Web Tokens securely

AES Encrypt/Decrypt

Secure text with AES-128/192/256

aes, encryption

Hash Lab

Generate MD5, SHA, and Blake hashes

Bcrypt Hash Generator

Generate and verify bcrypt password hashes

bcrypt, bcrypt hash

Substitution Cipher Breaker

Crack monoalphabetic substitution ciphers

substitution cipher, cipher breaker

Prime Checker

Test if numbers are prime

prime checker, primality

ROTn Cipher

Configurable Caesar cipher toolkit

rotn, caesar cipher

Random Number Lab

Generate random numbers with custom ranges

random numbers, rng

XOR Cipher

Encrypt data using XOR with any key

ROT13 Encoder/Decoder

Encrypt and decrypt messages with the ROT13 cipher

Prime Generator

Generate prime numbers within any range

prime numbers, prime generator

Letter Frequency Analyzer

Count letter distribution in any text

letter frequency, frequency analysis

Text Entropy Calculator

Measure Shannon entropy of strings

entropy, shannon entropy

Blowfish Cipher

Experiment with the Blowfish cipher

blowfish, encryption

Word Frequency Analyzer

See the top words inside any document

word frequency, entropy

Twofish Cipher

Modern Twofish cipher utility

twofish, encryption

RC4 Cipher

Stream cipher visualizer for RC4

rc4, stream cipher

DES Encrypt/Decrypt

Classic DES cipher playground

des, encryption

ROT47 Encoder/Decoder

Apply the ROT47 cipher to ASCII text

Random Prime Generator

Generate large random primes

random primes, prime numbers

Triple DES Encrypt/Decrypt

3DES cipher experimentation lab

3des, encryption

Alphabet Replacer

Swap characters with custom alphabets

alphabet, substitution

Solitaire Cipher

Encrypt messages using a deck of cards

solitaire cipher, cards

Twin Prime Generator

List twin primes up to any limit

twin primes, prime numbers

RC2 Cipher

Encrypt/decrypt with RC2

rc2, encryption

High Entropy Generator

Produce maximum-entropy byte strings

entropy, random data

RC5 Cipher

Block cipher experimentation for RC5

rc5, block cipher

ROT5 Cipher

ROT5 encoder/decoder for digits

RC6 Cipher

Explore RC6 encryption rounds

rc6, encryption

Cousin Prime Generator

Find cousin primes quickly

cousin primes, prime numbers

ROT2 Cipher

Shift digits by 2 (ROT2) for quick puzzles

Rabbit Cipher

Encrypt data with the Rabbit stream cipher

rabbit cipher, stream cipher

Prime Triplet Generator

Discover prime triplets

prime triplets, prime numbers

Random Data Analyzer

Run statistical tests on random data

random data, rng tests

Serpent Cipher

Encrypt data using Serpent

serpent, encryption

KASUMI Cipher

Simulate the 3G mobile KASUMI cipher

kasumi, encryption

Low Entropy Generator

Create predictable datasets for demos

low entropy, random data

Ake98 Cipher

Explore the Ake98 algorithm

Akelarre Cipher

Study the Akelarre block cipher

akelarre, cipher

Analyze Letter Frequency

Analyze Letter Frequency is an online tool that runs directly in your browser. Use it to process and transform text or data quickly without installing extra software.

analyze, letter

Analyze Word Frequency

Analyze Word Frequency is an online tool that runs directly in your browser. Use it to process and transform text or data quickly without installing extra software.

Rot47 Decrypt Data

Rot47 Decrypt Data is an online tool that runs directly in your browser. Use it to process and transform text or data quickly without installing extra software.

Rot47 Encrypt Data

Rot47 Encrypt Data is an online tool that runs directly in your browser. Use it to process and transform text or data quickly without installing extra software.

Crypto & Security | Utilz.io