There is a particular irony in using an insecure tool to do security work.
Yet developers do it every day. They paste API secrets into hash generators hosted on unknown domains. They decode JWTs containing user data on sites that log every request. They generate passwords through services that could, in theory, remember exactly what was generated and for whom.
WebdevToolbox’s security suite was designed around a single, non-negotiable principle: if a tool handles sensitive data, that data must never leave your device. Everything in this category runs entirely in the browser using the Web Crypto API and standard JavaScript cryptographic primitives.
Here is what the suite covers.
Hash Generator
Computes MD5, SHA-1, SHA-256, SHA-512, and SHA-3 hashes from text or file input. All hashing happens locally using the browser’s native Web Crypto API — the same cryptographic implementation used by your operating system.
When to use it: verifying file integrity, confirming that a secret value matches a stored hash, debugging authentication systems, or understanding how hash functions behave with different inputs.
A note on MD5 and SHA-1: these algorithms are cryptographically broken for collision resistance. We include them because they remain widely used for checksums and legacy system compatibility — not because we recommend them for new security implementations.
Password Generator
Generates cryptographically secure random passwords using crypto.getRandomValues() — the same entropy source used by security libraries and operating systems.
You configure length (up to 128 characters) and character sets: uppercase, lowercase, digits, and symbols. The generator also shows an entropy estimate, expressed in bits, so you can make an informed tradeoff between memorability and security. 128-bit entropy passwords are effectively uncrackable with any foreseeable computing power.
We do not store generated passwords. We cannot. They are computed locally and exist only in your browser until you close the tab.
Password Strength Checker
Paste in any password and get a detailed analysis: entropy in bits, character set diversity, pattern detection (dictionary words, keyboard walks, repeated sequences), and an overall strength rating.
Understanding why a password is weak is more useful than just being told it is. The checker explains its reasoning, which helps developers build better password requirements into their own applications.
bcrypt Generator
Hash and verify passwords using the bcrypt algorithm — the industry standard for password storage. The tool runs bcrypt entirely in the browser using a WebAssembly implementation, with configurable cost factors from 10 to 14.
Useful for testing bcrypt outputs, understanding the relationship between cost factor and computation time, and verifying that stored hashes correspond to known passwords during debugging.
HMAC Generator
Generate HMAC signatures using SHA-256, SHA-512, or MD5 with a secret key. HMAC is the signature scheme behind webhook authentication, JWT signing, and API request verification.
When you are debugging why a webhook signature does not match, or validating that your HMAC implementation produces the expected output, this tool gives you a ground truth to compare against.
UUID Generator
Generates RFC 4122 UUIDs in v1, v4, v5, and v7 formats. You can generate a single UUID or a batch of up to 1,000, formatted as a list or a JSON array.
The distinction between versions matters:
- v4 is the default for most use cases: purely random, 122 bits of entropy.
- v7 is the modern choice for database primary keys: time-ordered (sortable), with random bits for uniqueness. Dramatically better database index performance compared to v4.
- v1 embeds a timestamp and MAC address — useful when you need chronological ordering but are comfortable with the privacy implications.
- v5 is deterministic: the same namespace + name always produces the same UUID. Useful for content-addressable identifiers.
ULID Generator
ULIDs (Universally Unique Lexicographically Sortable Identifiers) are an alternative to UUIDs designed specifically for use as database primary keys. They are 128-bit, URL-safe, case-insensitive, and encode a millisecond timestamp in the first 10 characters — making them naturally sortable.
If you are starting a new project and need a primary key scheme, ULIDs are worth serious consideration.
RSA Key Pair Generator
Generates RSA public/private key pairs (2048-bit or 4096-bit) in PEM format using the Web Crypto API. The entire generation process happens in the browser; private keys are never transmitted.
Useful for local development, testing TLS configurations, generating SSH keys in constrained environments, and understanding how RSA key generation works.
Data Encryptor (AES-256-GCM)
Encrypts and decrypts arbitrary text using AES-256-GCM — a standard authenticated encryption algorithm — with PBKDF2 key derivation from a passphrase. All cryptographic operations use the browser’s native Web Crypto API.
This is not a substitute for a proper secrets management system in production. It is a browser-native, zero-dependency utility for encrypting data locally — useful for prototyping, testing encryption implementations, and understanding how modern symmetric encryption works.
Basic Auth Generator
Generates HTTP Basic Authentication headers from a username and password. Basic Auth is still widely used for internal APIs, development environments, and legacy systems. The generator produces the correctly formatted Authorization header value, base64-encoded and ready to paste.
Why This Matters
Security is the one domain where the choice of tooling has direct, concrete consequences. Pasting a private key into an untrusted tool — even once — can result in a security incident that takes days to remediate.
WebdevToolbox’s security suite is not just convenient. It is the right choice when the alternative is trusting unknown infrastructure with data that must stay private.
Try the security tools at webdevtoolbox.com/tools.