Explainer
What Is a QR Code and How Does It Work?
Learn how QR codes store data, how scanners read them, why error correction and borders matter, and what a QR code reveals about privacy.
6 min readRead guide
LeetTools · Generators
Browser QR Code and Credential Generators
Create QR codes, strong passwords, memorable passphrases, and unique usernames locally in the browser.
Get the job done
QR Code and Credential Generators
QR Code Generator
Create QR codes for URLs, text, Wi-Fi, contacts, email, phone, and SMS locally. Customize and download checked PNG or SVG images.
Password Generator
Generate passwords locally with cryptographic randomness. Choose length and character sets, and see a conservative entropy estimate.
Passphrase Generator (XKCD)
Build random word passphrases locally with your browser’s cryptographic random source. Choose word count, separators, and an optional digit.
Username Generator
Generate creative, cool, and anonymous usernames for games, social media, and developer accounts.
UUID / GUID Generator
Generate UUID v4 (random) and v7 (time-ordered) locally in your browser. Batch copy, formatting options, no server.
Solve a specific problem
Credential guides
How-to guideLocal Credential Kit
How to Create a Strong Password
Learn what actually makes a password strong—length, randomness, and uniqueness—and generate one locally with the LeetTools Password Generator.
5 min readRead guide
How-to guideLocal Credential Kit
Passphrase vs Password: Which Should You Use?
Compare passphrases and passwords by entropy, memorability, and where each fits. Decide based on how the credential will be stored and typed.
3 min readRead guide
How-to guideLocal Credential Kit
How to Create a Memorable Passphrase
Create a memorable passphrase from random words, generated locally in your browser. Learn how word count, capitalization, and separators affect strength.
5 min readRead guide
How-to guideLocal Credential Kit
How to Choose a Username That Doesn't Link Your Accounts
Choose a username that keeps your accounts separate. Learn how names, birth years, and repeated handles reveal identity, and generate random ones locally.
4 min readRead guide