Fonts and generic families

A site learns which fonts you have by measuring the width of a string, and separately asks for six generic families. Here both answers are shown the way a site sees them.

Your values right now

The rows below are measured on this page and stay in your browser.

Fonts found: Đang đo…
Widths of the generic families: Đang đo…

Mọi thứ trên trang này được đo trong trình duyệt của bạn và không bao giờ rời khỏi nó. Không yêu cầu mạng, không ghi nhật ký, không tài khoản.

The list of names

The page draws one string in different fonts in turn and measures its width. A font the system lacks gives the width of the fallback, and that is how the list is assembled without a single permission.

Six families with one measure

The word cursive is an errand, not a font: the system has to resolve it. A live machine answers serif, sans-serif, monospace, cursive, fantasy and math with different widths, while a profile of a foreign system often gives four identical ones.

What ARMANOS does

A profile's font list is derived from its number: the platform core plus some of the optional ones, and two profiles differ in list length by themselves.

Generic families for a foreign template are assigned only fonts the profile declares and the machine has.

How to compare two profiles

Open the page in two profiles of different systems. The lists have to differ, and the widths of the six families inside one profile have to be different from each other.

What this check does not show

The system's full font list. The page asks about a known set of names rather than reading the font directory.
Web page fonts. Fonts a site loads itself are not part of this list.
Second font names on macOS. Checking them is described in the post about fonts.

Where this is decided

The readings are measured in your browser, and the promises below are backed by files you can open.

Readings on the page come from an allowed list: apps/web/components/site/LiveReadout.tsx
Generic families for a foreign template are assigned only declared fonts: apps/desktop/test/generic-fonts.js
A profile's font list is its own and does not change between launches: apps/desktop/test/fingerprint-consistency.js

Questions

Why is my font not in the list?: The page asks about a set of common names. A font outside the set is not asked about at all.
What do identical family widths mean?: The system resolved several families to one fallback font. That is rare on a live machine and common on a profile of a foreign system.
Is the list sent anywhere?: No. The widths are measured in your browser.

Next to this

Two profiles give two different answers

In ARMANOS these values are decided inside the browser engine before the page gets anything. Open two profiles, run the check in both and compare.

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