Your HUD only needs a few text styles, but they have to behave predictably when the player zooms, when resolution changes, and when you shift UI scale for accessibility. The easiest way to keep it readable is to design a type scale like you would for gameplay: constrain it, test it in context, then lock the rules into your font and UI layout.
Start with a small, fixed type scale
Most HUDs drift into “whatever looks right” sizing. That works until you change UI scale or the camera distance changes, and suddenly the smallest labels blur together.
A practical approach is to pick a handful of sizes that cover every HUD role:
- 12–14 px: tiny labels (buff names, ammo sublabels, small icons’ captions)
- 16–18 px: body text (tooltips, inventory item names, short descriptions)
- 20–24 px: primary UI text (health values, quest step titles, selected item)
- 26–30 px: emphasis (warnings, “LOW AMMO”, “OBJECTIVE UPDATED”)
You don’t need many steps. If you catch yourself adding a “slightly bigger” variant, that’s usually a sign the layout needs more spacing or the outline rules need tightening.
Field note: make the smallest readable first
Design from the smallest size up. If your smallest labels aren’t readable with the same outline/shadow rules as everything else, you’ll be tempted to increase sizes everywhere later. Fix the base readability first, then scale up.
Choose line heights that don’t fight your layout
Line height is where HUD text tends to break. Too tight and glyphs collide visually; too loose and multi-line tooltips become blocks that cover gameplay.
Use a simple rule of thumb for HUD UI text blocks:
- Line height ≈ 1.1–1.25 × font size for single-line UI labels and compact tooltips.
- Line height ≈ 1.2–1.35 × font size for longer, multi-line panels where players scan more than they read.
Then apply it consistently per text role. If your “body” text has one line height and your “tooltip” text has another, you’ll get uneven vertical rhythm across the HUD.
Field note: avoid fractional chaos
If you’re working in pixel UI and you end up with line heights that don’t land cleanly, text will “swim” when you adjust UI scale. Prefer line heights that land on whole pixels at your target scale, or at least stay close.
Outline and shadow rules: pick one primary method
For HUD legibility, you need separation from the background. There are two common strategies:
- Outline-first (best for crisp pixel-like readability)
- Shadow-first (best when backgrounds are busy but you want softer depth)
You can combine them, but don’t mix styles per element unless you want a visual hierarchy that’s hard to maintain.
Outline-first settings that usually hold up
When you use an outline, treat it like part of the glyph. It should remain visible at the smallest size without turning into a thick halo at larger sizes.
A workable starting point:
- Outline thickness that is small relative to font size (think “just enough to separate”).
- Keep outline colour high contrast against the most common HUD backgrounds (often dark outline on bright panels, or light outline on dark panels).
- Avoid outlines that are so thick they flatten character shapes. If your letters stop looking like letters, you’ve gone too far.
Shadow-first settings that don’t smear
Shadows help, but they can blur into the background at lower scales.
A workable approach:
- Keep shadow tight (small offset).
- Use a softness that doesn’t turn into a blur blob at the smallest size.
- Don’t rely on shadow alone for the smallest labels—outline or a stronger contrast treatment is usually required.
Field note: test against your worst background, not the clean one
Your HUD will look perfect on a flat test screen and fail in the actual game. Test overlays on:
- bright explosions,
- high-contrast silhouettes,
- foggy distance scenes,
- UI panels over scrolling parallax.
If the outline/shadow rules survive those, you’re set.
Build the font to match your HUD constraints
A type scale only works if the font behaves consistently at the sizes you chose. For HUDs, you typically want a bitmap font designed around the glyph sizes you’ll actually use.
Use a bitmap font workflow where you generate a font atlas with a glyph set that matches your UI needs. A common mistake is generating a font that looks fine at one size, but the atlas doesn’t include enough characters or the glyph shapes don’t hold at the smallest label size.
With Bitmap Font Generator, you can generate a styled 36-glyph sheet (A–Z and 0–9) and pair it with a glyph map so your UI text is predictable. That constraint is useful: it nudges you toward a HUD that uses consistent, legible character sets (names, numbers, short codes) rather than trying to render everything in one style.
What works vs. what doesn’t
Works:
- Numbers, short labels, stats, timers, ammo counts, quest steps.
- UI text that’s mostly uppercase or uses a limited character set.
- A single font style used across the HUD with consistent outline/shadow rules.
Doesn’t work well:
- Long paragraphs in tiny sizes.
- Mixed-case typography where the font design doesn’t preserve readability at the small sizes you selected.
- Overly thin strokes that disappear when the outline/shadow treatment is minimal.
Where the limits are (and how to plan around them)
Even with a tight type scale, there are hard limits:
-
If the camera distance changes a lot, you can’t “fix” it with text styling. At some point, the player won’t be able to read small HUD content because it’s competing with world motion and depth cues. The fix is usually hierarchy: make the most important values large enough to read, and demote secondary info.
-
If the UI scale changes freely, you need a clamp. Letting UI scale go too small forces you into outlines so thick they ruin shapes. Letting it go too big makes your HUD feel chunky and pushes text into awkward wrapping. Decide the minimum readable scale and design around that.
-
If your text wraps unexpectedly, line height and spacing will betray you. For tooltips and multi-line labels, test wrapping lengths. A type scale that looks correct on one-line labels can become messy when you hit two or three lines.
Field note: prefer fewer, clearer text roles
Instead of ten different styles, aim for:
- one “label” style,
- one “body” style,
- one “emphasis” style,
- and one “alert” style.
Then enforce the rules in layout, not just in the art.
Put it into practice with a repeatable build
Once you’ve chosen your sizes, line heights, and outline/shadow rules, commit to them in your UI layout and font generation. Generate your HUD font with Bitmap Font Generator, then create a small test scene in your engine where the HUD overlays:
- a bright background,
- a dark background,
- and a busy, moving background.
Change only one variable at a time: UI scale first, then camera distance, then tooltip wrapping. If anything becomes unreadable, don’t tweak everything—return to the smallest size and adjust the outline/shadow rules or line height until it holds.
Next, generate your HUD font set and lay out three HUD screens (clean, busy bright, busy dark) using only your chosen type scale, then lock the smallest label size and outline rules before you add new UI elements.