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ガイド
画面、解像度、ピクセルの仕組みを実践的にわかりやすく解説します。
1080p vs 1440p vs 4K: which resolution should you choose?
A practical comparison of 1080p, 1440p and 4K — pixel counts, sharpness, performance cost and which one is right for your monitor size and use.
ガイドを読む →What is device pixel ratio (DPR)?
Device pixel ratio explained: why your 'Retina' or 4K screen reports a smaller resolution to the browser, and what that means for images and CSS.
ガイドを読む →Aspect ratio vs resolution: what's the difference?
Aspect ratio and resolution are related but not the same. Learn how shape and pixel count interact, and why 16:9, 16:10 and 21:9 matter.
ガイドを読む →How to change your screen resolution (Windows, macOS, mobile)
Step-by-step instructions to change or fix your screen resolution on Windows 11, macOS, Android and iPhone — plus what to do when it looks blurry.
ガイドを読む →Screen size vs resolution: what's the difference?
Screen size and resolution sound like the same thing but measure two different things. Learn how inches and pixels relate, and why both matter for sharpness.
ガイドを読む →What is PPI (pixels per inch) and how do you calculate it?
PPI measures how tightly packed a screen's pixels are. Learn the formula, what counts as 'sharp', and how PPI explains why two screens look so different.
ガイドを読む →What is refresh rate (Hz)? 60Hz vs 120Hz vs 144Hz explained
Refresh rate measures how many times per second your screen redraws. Learn what Hz means, why higher feels smoother, and whether 120Hz or 144Hz is worth it.
ガイドを読む →CSS breakpoints for responsive design: a developer's guide
A practical guide to responsive breakpoints — the common Tailwind and Bootstrap values, how to choose your own, and why you should design mobile-first.
ガイドを読む →Why does my screen look blurry? How to fix scaling and resolution
Blurry text or a fuzzy desktop is almost always a resolution or scaling problem. Here's how to diagnose it on Windows and macOS and get back to a crisp display.
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