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 articles
Practical Tool Guides and Troubleshooting
Solve real file and developer-tool problems with focused LeetTools guides, clear limitations, local-processing options, and links to the relevant browser tools.
Generators
Browser QR Code and Credential Generators
Create QR codes, strong passwords, memorable passphrases, and unique usernames locally in the browser.
how to
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
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
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
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
Archive Files
Browser Archive Tools and Guides
Extract, convert, create, and troubleshoot common archive formats with practical browser-based workflows.
how to
How to Open 7Z Files on Mac Without Installing an App
Open 7Z files on Mac with Archive Utility, a local browser extractor, or a desktop app. Compare options for previews, passwords, and split archives.
5 min readRead guide
how to
How to Convert 7Z to ZIP on Mac Without Uploading
Convert 7Z to ZIP on Mac with a local browser tool, 7-Zip commands, or a GUI app. Compare password support, metadata changes, and memory limits.
5 min readRead guide
how to
How to Open RAR Files on Mac Without The Unarchiver
Open RAR files on Mac without installing an app, or choose a desktop extractor for regular use. Learn about passwords, multipart archives, and browser limits.
5 min readRead guide
how to
How to Create a Password-Protected ZIP on Mac
Create a password-protected ZIP on Mac with a browser tool, Terminal, or a GUI app. Compare AES, ZipCrypto, recipient compatibility, and local processing.
6 min readRead guide
Images
Browser Image Tools and Guides
Batch convert, resize, arrange, and combine common image formats with practical browser-based workflows.
how to
How to Combine Screenshots Into One Image
Combine screenshots horizontally, vertically, or in a grid. Set spacing and image scale, choose export bounds, and save one PNG, JPEG, or WebP.
7 min readRead guide
how to
How to Batch Convert Images to WebP
Batch convert PNG, JPEG, WebP, and AVIF images to WebP with shared batch settings. Adjust quality or maximum dimensions, then download files or one ZIP.
8 min readRead guide
how to
How to Convert WebP to PNG Without Uploading
Convert still WebP images to PNG, retain transparency, and optionally resize a batch. Compare browser conversion, desktop editors, and dwebp commands.
7 min readRead guide
Network
Browser Network Privacy Tools
Inspect browser network activity and region signals, and redact supported secrets from HAR files before sharing.
how to
How to Share a HAR File Without Leaking Tokens
Chrome’s default HAR export already drops Cookie and Authorization. Query tokens such as access_token and password fields in JSON can remain. Compare Chrome, Firefox, and a local sanitizer.
5 min readRead guide
how to
How to See What Data a Website Sends
Use Chrome or Edge DevTools to see what data a website sends. Real screenshots explain file uploads, request payloads, and form data sent before submission.
10 min readRead guide