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Browser text rendering applies sub-pixel antialiasing (ClearType on Windows, Core Text on macOS, FreeType on Linux) that differs from design tool rasterisers. Browsers also respect the CSS font-smooth and -webkit-font-smoothing properties, which toggle between auto, antialiased, and subpixel-antialiased modes. Small discrepancies in letter-spacing and line-height are normal; the best way to validate a font choice for the web is to preview it in the target browser, as FontFYI does.

The W3C's Web Content Accessibility Guidelines (WCAG) 2.1 do not mandate a specific size but classify text below 18 pt (24 px) or 14 pt bold (approximately 18.67 px) as 'normal' text, requiring a contrast ratio of at least 4.5:1. Most usability research recommends a minimum of 16 px for body copy on screens, with line-height set between 1.4 and 1.6 times the font size. Display fonts at 32 px or larger can tolerate looser letter-spacing (tracking) because the eye reads individual characters rather than word shapes at that scale.

Each Google Font family declares supported Unicode subsets in its metadata—typically latin, latin-ext, cyrillic, greek, vietnamese, and script-specific subsets for Arabic, Devanagari, etc. FontFYI's preview tool lets you paste non-Latin text to instantly verify whether the selected font renders the characters correctly or falls back to the system font. If characters appear as hollow boxes (tofu), the family lacks the required glyph coverage and you should choose a family with the appropriate subset.

CSS font-weight values map to named weights: 400 is 'regular' (normal body text) and 700 is 'bold' (emphasis). The full numeric scale runs from 100 (Thin) to 900 (Black). Variable fonts allow any integer value within the supported range, so a variable font with wght axis from 100 to 900 can render at 450 or 612. Non-variable fonts snap to the nearest defined weight file, so requesting font-weight: 450 on a font that only has 400 and 700 will render at 400.

Yes. The vast majority of Google Fonts families are licensed under the SIL Open Font Licence (OFL) version 1.1, which permits use in both personal and commercial projects, including embedding in documents, apps, and websites. A small number of families use the Apache 2.0 licence, which is equally permissive. Neither licence requires attribution in most cases, though attribution is encouraged. FontFYI displays the licence for each family so you can confirm terms before deploying.