Online Web Tools
A collection of free online tools and utilities to make life easier
UUIDv4 Generator, MD Generator, SHA Generator, Bcrypt Generator, Hash Generator, and Password Strength Checker
Modern applications rely on cryptographic tools and identifiers to ensure security, data integrity, and reliable functionality. Among the most important of these tools are UUIDv4 generators, MD and SHA hashing algorithms, Bcrypt password hashing, general hash generators, and password strength checkers. Together, these components form the foundation of secure and efficient software systems.
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Introduction
Modern web and mobile applications rely heavily on unique identifiers, cryptographic hashes, and password-handling tools. This article covers six related utilities often found in developer toolkits and web tool collections: UUIDv4 Generator, MD (MD5) Generator, SHA Generator, Bcrypt Generator, generic Hash Generator, and Password Strength Checker. Understanding how each works and where to apply them correctly is essential to build secure and maintainable systems.
UUIDv4 Generator
What is UUIDv4?
UUID stands for Universally Unique Identifier. Version 4 (UUIDv4) is generated using random numbers. The UUIDv4 format is a 128-bit value typically displayed as 32 hexadecimal characters separated by hyphens into five groups: 8-4-4-4-12. Example: 3f2504e0-4f89-11d3-9a0c-0305e82c3301.
When to use UUIDv4
- Identifiers for database records where collision risk must be negligible.
- Public API keys or tokens that do not encode sensitive metadata.
- Distributed systems where generating sequential IDs centrally is impractical.
Advantages and caveats
UUIDv4 is simple and nearly collision-free, but it is not suitable for cryptographic purposes like secrets or authentication tokens because it's random but not necessarily unpredictable if the RNG is weak. Also, UUIDs are verbose compared to compact integer IDs and can produce index fragmentation in some databases.
Example (JavaScript)
// Using crypto API in modern browsers or Node.js
function uuidv4() {
// crypto.getRandomValues returns cryptographically strong random values
return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c =>
(c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
);
}
console.log(uuidv4());MD (MD5) Generator
What is MD5?
MD5 (Message Digest 5) is a cryptographic hash function that produces a 128-bit hash value represented as 32 hexadecimal characters. It was widely used for checksums and data integrity verification.
Current status and caution
MD5 is considered cryptographically broken and unsuitable for collision-resistant applications (an attacker can craft two inputs with the same MD5 hash). It still sees use for non-security purposes like checksums, deduplication, and legacy systems, but it must not be used for password hashing or digital signatures.
Use cases
- Quick checksums for large files where collision attack risk is acceptable.
- Legacy protocols and systems that require MD5 for compatibility.
Example (Python with hashlib)
import hashlib