Preview text across common fonts at once
These are common fonts pre-installed on most operating systems, so no extra font files need to be downloaded. If a font isn't installed on your device, the browser will automatically fall back to a default font instead of showing an error or blank text.
The Font Preview Tool does one simple thing: you type the text you plan to use, and the page renders that same text in 12 common fonts, one under another, with a single slider to change the size for all of them. It's meant for the quick comparison you want before writing CSS, designing a poster, or laying out a document. It is not a font download site, it can't upload or install fonts, and it won't tell you which font is 'best.' It simply shows what your own device is able to render.
Say you're building a landing page for a Chinese brand whose headline mixes Chinese characters with an English word. Paste the headline into the box, push the size to around 40px, and read down the list. SimSun, KaiTi and FangSong tend to feel traditional or literary; SimHei, Microsoft YaHei and PingFang look cleaner and more modern; Georgia and Times New Roman give the Latin letters serifs while Arial and Verdana don't. This is a qualitative comparison only. The tool gives no scores or recommendations, and the final choice depends on your brand and where the text will be read.
Because those fonts aren't installed on your device. The browser walks down the font-family list, and when nothing matches it falls back to the generic family at the end (sans-serif, serif or monospace). Several cards are then really showing the same system default. Open the page on a machine that has the fonts, or compare a Mac with a Windows PC, and the differences appear.
Serif fonts (SimSun, Georgia, Times New Roman) have small finishing strokes on the ends of letters and are traditionally used for long passages in print. Sans-serif fonts (SimHei, Microsoft YaHei, Arial, Verdana) have more uniform strokes and are common for headings and interface buttons. That's a rule of thumb rather than a law: on low-resolution screens a small serif can look thin, so try lowering the slider to the size you'll actually use.
The tool only displays fonts already installed on your system. It doesn't distribute any font files and makes no licensing judgment. If you plan to use a font in print, commercial posters or an app bundle, read its license yourself; being pre-installed on an operating system doesn't automatically mean you may embed or redistribute it.
Only on visitors' devices that have the same font installed. Web designers usually list several candidate fonts in font-family and end with a generic family, so devices without the first choice still show something reasonable. Use this tool to understand how each font looks in your environment, not as a cross-device final check.
Not directly. You can't upload a font here. Even if you've installed one on your system, the list is a fixed set of 12 entries and the tool doesn't enumerate your installed fonts, so your own font won't show up.
Based on the code, previews are produced entirely by your browser's CSS rendering. The text you type stays in page memory, isn't sent to a server, and no font files are downloaded. Closing or reloading the page discards it.