Typography Best Practices for Image Design
Learn how to choose, pair, and style fonts effectively for text-based images that are readable, professional, and visually stunning.
By Tu Luu · · · 10 min read
Setting type for an image is not the same job as setting type for a web page, and the difference is not stylistic. On a page, text stays text: the reader's browser can reflow it, scale it, restyle it, and read it aloud. The moment you render it into a PNG, all of that stops. Your line breaks are final, your size is final relative to the canvas, and nothing downstream can rescue a bad decision.
That permanence changes which rules matter. Reflow-related advice becomes irrelevant. Anything about how the type survives resampling — being scaled down by a feed, recompressed by a platform, viewed on a phone at a quarter of the size you designed it — becomes the whole game.
This guide covers the decisions that actually change the output: category, size in pixels, pairing, and spacing. It assumes you have already settled contrast, which is covered separately in the colour guide.
Understanding Font Categories
Fonts are broadly categorized into families, each with distinct characteristics and best-use cases. Understanding these categories helps you make informed choices.
Serif Fonts
Fonts with small decorative strokes (serifs) at the ends of letters. Examples: Times New Roman, Georgia, Garamond.
Best for: Formal documents, books, newspapers, traditional/classic aesthetics
Sans-Serif Fonts
Clean fonts without decorative strokes. Examples: Arial, Helvetica, Roboto, Open Sans.
Best for: Digital screens, modern designs, headlines, UI elements
Monospace Fonts
Each character occupies the same horizontal space. Examples: Courier, Consolas, Monaco.
Best for: Code snippets, technical content, tabular data, typewriter aesthetics
Display/Decorative Fonts
Stylized fonts designed to attract attention. Vary widely in style from playful to elegant.
Best for: Headlines, logos, special occasions—never for body text
Font Size Guidelines
Size in a text image is meaningless in absolute terms — what matters is size relative to the canvas, because that ratio is what survives when the image is scaled. A 48px headline on an 800px canvas is 6% of the width; the same 48px on a 1920px canvas is 2.5%, and will look like fine print in the same feed.
A practical floor: text should be at least 2.5% of the canvas width to stay readable after a platform downscales it for a thumbnail. On a 1080×1080 Instagram square that means roughly 27px minimum; for anything meant to be read at a glance, 4–6% (44–65px) is the comfortable band.
The figures below assume an 800–1200px canvas, which is what most of these use cases actually target. Note that sizes here are CSS pixels, not points — at the standard 96 DPI mapping described in the CSS Values specification, 1pt = 1.333px.
| Use Case | Recommended Size | Notes |
|---|---|---|
| Social media posts | 24-48px | Larger for quotes, smaller for supporting text |
| Watermarks | 12-24px | Should be visible but not distracting |
| Headlines/Titles | 36-72px+ | Scale with importance and canvas size |
| Body text in images | 16-24px | Minimum 14px for legibility |
| Product labels | 18-32px | Depends on label size and viewing distance |
Font Pairing: Combining Fonts Effectively
Using two complementary fonts creates visual interest and establishes hierarchy. Here are proven strategies for successful font pairing:
Contrast is Key
Pair fonts that are clearly different—a bold sans-serif headline with a delicate serif body text, for example. Fonts that are too similar create awkward tension.
Serif + Sans-Serif
The classic combination. Use a serif for elegance and a sans-serif for clarity, or vice versa. Example: Playfair Display (serif) with Roboto (sans-serif).
Same Family, Different Weights
Use the same font in different weights (regular, bold, light) for guaranteed harmony. Many typeface families offer enough variety for complete projects.
Limit to Two Fonts
More than two fonts typically looks chaotic. If you need variety, adjust weight, size, or color instead of adding another typeface.
Spacing: The Secret to Professional Typography
Proper spacing separates amateur designs from professional ones. Master these spacing concepts:
Line Height (Leading)
The vertical space between lines, expressed as a multiple of font size. Use 1.4–1.6 for anything read as prose — WCAG SC 1.4.12 treats 1.5 as the line height content must remain usable at. Headlines can tighten to 1.1–1.2 because there is less line-to-line tracking for the eye to do. Below 1.0 the descenders of one line start colliding with the ascenders of the next.
Letter Spacing (Tracking)
Space between characters, controlled in CSS by letter-spacing. Type is spaced by its designer for its intended size, so the rule is: open it up slightly for all-caps and for small sizes, tighten it a little for very large headlines. Roughly ±0.02em is enough — beyond that you are fighting the typeface.
Padding & Margins
Text needs breathing room. Keep text away from edges—add padding equal to at least the font size on all sides.
Text Alignment
Left-aligned is easiest to read. Center for short text like quotes. Avoid justified text in images—it can create awkward spacing.
💡 Pro Typography Tips
Avoid Decorative Fonts for Long Text
Script and novelty fonts are hard to read in paragraphs. Save them for short headlines or accents only.
Test at Actual Size
What looks good at 200% zoom may be unreadable at actual size. Always preview at the intended display dimensions.
Mind All-Caps Readability
Capitals turn every word into the same rectangular silhouette, removing the ascender and descender pattern readers use to recognise words at speed — the reason legibility researchers have consistently found continuous all-caps text slower to read than mixed case. Fine for a three-word label, poor for a sentence. If you do use it, add letter spacing.
Establish Clear Hierarchy
Headlines should be 1.5-2x larger than body text. Use size, weight, and color to guide viewers through content order.
Common Typography Mistakes to Avoid
Using Too Many Fonts
Stick to 2 fonts maximum. Multiple fonts look unprofessional and distract from your message.
Insufficient Contrast
Light gray text on white backgrounds is a common error. Ensure readable contrast ratios (4.5:1 minimum).
Ignoring Line Length
Lines too wide or too narrow are hard to read. The long-standing typographic guidance, set out in Robert Bringhurst's The Elements of Typographic Style and repeated in Butterick's Practical Typography, is 45–75 characters per line, with about 66 as the comfortable target. In a fixed-width image you control this directly: set the canvas width, then reduce the font size until a full line lands in that range.
Stretching or Distorting Fonts
Never manually stretch text. If you need a wider or narrower look, choose a font designed that way.
Recommended Fonts for Image Creation
Our Text to Image tool supports any font installed on your system. Here are excellent choices for different purposes:
Clean & Modern
- • Roboto
- • Open Sans
- • Lato
- • Montserrat
Classic & Elegant
- • Georgia
- • Playfair Display
- • Merriweather
- • Libre Baskerville
Impact Headlines
- • Impact
- • Oswald
- • Bebas Neue
- • Anton
Conclusion
Good typography is invisible—it communicates your message without drawing attention to itself. Bad typography, on the other hand, creates friction that reduces comprehension and credibility.
Start with readable fonts, establish clear hierarchy, mind your spacing, and always test at actual size. With practice, these principles will become second nature, and your text-based images will look significantly more professional.