Practical guides for the tools on LightDarkTools
Each guide answers a specific question people search for — comparing JSON files, setting up a Wi-Fi QR code, making a PDF readable on a phone, or preparing app store screenshots. All the tools used are free and run entirely in your browser.
How to compare two JSON files online without uploading them
Use a browser-based diff workflow for API responses, config files, and exported structured data.
QRHow to create a Wi-Fi QR code that guests can scan instantly
Turn a network name and password into a scannable QR code for homes, offices, events, or cafes.
PDFHow to make a PDF easier to read on a phone
Improve mobile reading when a PDF feels too cramped, wide, or zoom-heavy on small screens.
App MarketingApp store screenshot tips for Android and iPhone listings
Structure your screenshots, captions, and ordering so store visitors understand the value quickly.
ArchiveHow to compress and extract ZIP or TAR.GZ files online
Pack files into archives or extract zip and tarballs entirely in your browser without uploads.
Browse the free tools
Each guide includes a direct link to its matching tool so you can go from reading to doing in one click. All tools are free, require no account, and keep your files on your device.