Guides & How-tos
Plain-English guides to image formats, compression, PDFs and video – written to answer the questions people actually search for, with free tools to do the job.
How to Calculate Percentage: Formulas, Examples, and Shortcuts
Learn how to calculate percentage step by step: percent of a number, percentage change, reverse percentage, and quick mental-math shortcuts.
How to Convert PDF to JPG (Free, on Any Device)
Learn how to convert PDF to JPG free on any device. Step-by-step browser method plus Windows, Mac, iPhone and Android options, and quality tips.
How to Make a GIF from a Video (Free, No Watermark)
Learn how to make a GIF from a video in your browser, free and watermark-free. Control length, size, fps and width, then compare GIF vs MP4.
How to Make a QR Code (Free, No App Needed)
How to make a QR code in under a minute: what it encodes, static vs dynamic, error correction levels, and printing rules so it always scans.
How to Reduce Image Size Without Losing Quality
Learn how to reduce image size for uploads, forms, and email using compression and resizing — plus target sizes like 50KB, 100KB, and 200KB.
JPG vs PNG: Which Image Format Should You Use?
JPG vs PNG explained in plain English: compression, transparency, file size, and quality — with a comparison table so you pick the right format every time.
How to Create a Strong Password (That You Can Remember)
How to create a strong password using length and entropy, not tricks: passphrases, password managers, 2FA, and what to do after a data breach.
What Is a Good BMI? Healthy Ranges and What the Number Actually Means
What is a good BMI? See the WHO chart, healthy ranges in kg and lb, why the formula has limits, and better measures to use alongside it.
What Is HEIC? Apple's Photo Format Explained (and How to Convert It)
What is HEIC and why won't it open everywhere? Learn how HEIC works, HEIC vs JPG, and how to convert HEIC to JPG in seconds, free and private.