JPKCom DB

Fonts — Tips & Tricks

Tricks for the Fonts tester: compare typefaces wisely, spot glyph traps, the Google Fonts privacy angle, the clamp() calculator and pairing with other JPKCom tools.

Back to the overview: Fonts · Open the tool: www.jpkc.com/tools/fonts/

The Manual explains every feature; the Examples show the workflows. This page is about what both assume: what to look for when comparing, what traps the tool has, and how to keep privacy in view. The interface is in English, so the real labels appear as on screen.

Compare typefaces wisely

  • Compare on your text, not on "AaBbCc". The editable rows in the Specimen tab and the Editable Sample Layout exist precisely for this: type your real heading, your real brand name, your real body copy. A typeface that shines in the sample alphabet can stumble on your actual word — and vice versa.
  • There is no split screen — use two tabs. The tool always shows one typeface. For a true parallel comparison, open it in two browser tabs, load one font in each, type the same text and flip between them by switching tabs (see Example 1).
  • Judge at reading size, not just large. Display sizes flatter. The decisive question is often how a typeface behaves at 14–18 px in a paragraph — which is what the small steps in the specimen table are for.
  • Keep a system font alongside as a reference. Load a base font such as Georgia or Segoe UI for comparison. If your chosen face offers no clear advantage over a solid system font, picking the system variant saves you a web-font download.

Glyphs and weights — the common traps

  • Always check glyph coverage before you commit. Young or decorative Google Fonts in particular often cover only the basic alphabet. In the Glyphs tab, empty or substituted cells immediately reveal whether the eszett, the umlauts, the euro sign or the typographic quotation marks are missing.
  • Watch the disabled weight buttons on Google Fonts. They are not a glitch but information: they show the cuts that font does not have. If a Light (300) or Black (900) you need is greyed out, the typeface is out — or you live with synthetic cuts.
  • Synthetic cuts on base/custom fonts deceive. For base fonts and Custom CSS File, all 18 weight buttons are active. That does not mean the font really ships every cut — if one is missing, the browser computes it (faux bold/italic). That looks more plausible in the preview than it would be in production with a real font file. With custom fonts, rely on what you licensed, not on the button.

Keep privacy in view

  • A Google Font preview contacts Google. The moment you display a Google typeface, your browser loads it directly from fonts.googleapis.com and fonts.gstatic.com — Google sees your IP. For a quick preview that is harmless. For production, though, the usual lesson holds: self-host web fonts rather than embedding them live from Google, otherwise the embed is a GDPR concern.
  • Custom CSS URLs go to their provider. A URL entered in the Custom CSS File field is loaded straight from your browser too — the provider (Adobe, Bunny, your CDN) gets a request carrying your IP. That is intended while testing, but good to know.
  • The font list is harmless. Filling the Google Fonts dropdown runs off a server-side cached list, not through your browser. Only displaying a font triggers the Google request.

Use the clamp() calculator properly

  • Start with a preset, then fine-tune. The Type Scale Presets (Small to Display) set sensible Min/Max pairs for you; from there you adjust to your design. That is faster than starting from scratch.
  • Set the viewport range realistically. Min Viewport 320 px and Max Viewport 1440 px cover most cases. Set the maximum too high and the font barely grows on normal screens; too low and it is already capped on large monitors.
  • Trust the live preview, not just the number. Drag the browser window narrow and wide and watch the preview text. The readout names the current viewport width and the resulting size — so you see whether the span between min and max interpolates pleasantly or jumps too abruptly.
  • Take the right code form. If you need the value as a design token, grab the CSS custom property from the Code Examples accordion; if you work in Tailwind, the arbitrary-value class. You do not have to translate the clamp() expression into your format by hand (step by step in Example 5).

Pair with other JPKCom tools

  • Found a typeface? Now the colour. Typeface and colour together decide the tone of a design. With Colors you build the palette that fits your type.
  • Embedded a web font? Check the load time. Embedded web fonts can be render-blocking and cost performance. The SEO & GEO Analyzer shows you, on a real URL, how your fonts affect page size, render-blocking resources and performance.
  • Glyphr Studio for the editing step. If you want not just to test a typeface but to adjust or draw one, the link at the foot of the page leads to the external editor Glyphr Studio.

More context: the overview for the big picture, the Manual for every feature, and the Examples for the step-by-step workflows. You can try everything directly in the tool.