Most readers meet your cover as a thumbnail the size of a postage stamp. On a retailer's search page, in a list of recommendations, on a phone, the cover is about a hundred pixels wide, and if the title cannot be read at that size, it may as well not be there. Cover text is the part of the design that writers can control most easily and that fails most often. This guide covers the principles of readable cover text: hierarchy, size, contrast, font choice and spacing, how to test at thumbnail size, and how to use Quillen's text presets and thumbnail preview.
The short answer
Make the title big, bold and high-contrast, set the author name smaller but clear, choose one or two simple fonts, and test the whole cover at about 100 pixels wide. If you cannot read the title at that size, enlarge it, thicken it or add contrast. In Quillen, the ebook cover editor has 17 text style presets and a thumbnail preview that shows your cover at small sizes while you work.
Why thumbnails matter
Most book discovery now happens on screens. A search result might show your cover at 100 to 150 pixels wide. A phone's recommendations strip may show it even smaller. At that size you cannot read a subtitle, a tagline or a review quote. The cover has one job: to say what the book is, in a glance. For that, it needs a clear title and a clear signal of genre.
The four principles
1. Hierarchy
Decide what the reader should see first, second and third. For most books: the title, then the author name, then (if at all) a tagline. Everything else is optional. If every element is the same size, nothing wins, and the eye finds nothing to rest on.
2. Size
The title should fill most of the width of the cover, in as few lines as possible. A long title can be broken into two or three lines at natural points, but keep each line large. The author name can be smaller, but still readable at thumbnail size, especially if you are a known name.
3. Contrast
Light text on a dark area or dark on light, never mid-tone against mid-tone. If your background is busy, add a darker overlay, a shadow, an outline, or a solid strip behind the text. Check the contrast in greyscale: if the words fade when the colour is gone, the contrast is weak.
4. Simplicity
Use one or two typefaces. A strong display face for the title, and a simple companion for the author name and tagline. Avoid thin or ornate script fonts for the main title: fine strokes vanish at small sizes.
Matching type to genre
Cover typography signals genre. Readers recognize it before they read a word. Here are the broad conventions:
| Genre | Typical title style | What to avoid |
|---|---|---|
| Thriller, crime | Large, bold, condensed capitals; author name big if well-known | Delicate scripts |
| Romance, women's fiction | Elegant serif or flowing script, often in colour | Heavy, aggressive fonts |
| Fantasy, science fiction | Strong display or serif capitals, sometimes with effects like metallic or glow | Comic or casual fonts |
| Horror | Stark, high-contrast type, often with a distressed or glitch look | Cute or rounded fonts |
| Literary fiction, memoir | Restrained serif, lots of space | Over-decoration |
| Nonfiction, business | Clean sans or serif, clear subtitle | Decorative display fonts |
Common mistakes
| Mistake | Problem | Fix |
|---|---|---|
| Title too small | Unreadable as a thumbnail | Fill the cover's width |
| Low contrast | Words disappear on busy art | Add overlay, outline, shadow or a strip |
| Too many fonts | Looks amateur | Two at most |
| Thin, ornate script | Vanishes at small sizes | Choose a bolder face, or reserve it for the author name |
| Text too close to the edge | Cut off or crowded | Keep inside the safe area |
| Subtitle at body size | Illegible at thumbnail size | Keep it short, or cut it from the cover |
| Ignoring the thumbnail | The cover fails where readers meet it | Test at about 100 pixels wide |
A thumbnail test routine
- Look at the cover at full size and decide whether the hierarchy is clear.
- Shrink the cover to about 100 pixels wide and look at it for a few seconds. Can you read the title? The author name?
- Squint at it, or convert it to greyscale. Does the title still stand out from the background?
- Put it next to three bestselling covers in your genre. Does it look like it belongs, and does it stand out?
- Ask someone who has not seen it what the title is, from a thumbnail.
Do it in Quillen
Quillen's ebook cover editor has a library of text style presets and a thumbnail preview. The same text tools are in the paperback editor.
- Open the editor. Click Cover in the header and choose eBook cover.
- Add or select text. Click + Text to add a text box, or click the title on the cover to select it. The right panel shows its options.
- Try a preset. Quillen has 17 text styles: Clean white, Bold outline, Soft shadow, Gold gradient, Fire, Neon sign, Neon outline, Retro 3D, Glitch echo, Label, Black strip, Arch title, Wave, Bridge, Ring and Horror. Click one to apply it, and adjust from there.
- Adjust the details. Choose a font (including Google Fonts), size, bold or italic, alignment, letter spacing, line height, solid or gradient fill, outline, shadow, glow, a highlight box behind the text, or a curved or wavy shape.
- Open the thumbnail preview to see the cover at small sizes while you work. Check that the title still reads.
- Check the safe area. Keep text inside the guide.
- Export. Choose a size and format. KDP's ideal ebook size is 1,600 x 2,560 pixels.
Checklist
- Clear hierarchy: title, author, optional tagline.
- Title large enough to read at about 100 pixels wide.
- High contrast, checked in greyscale.
- One or two simple fonts.
- Typography that signals the genre.
- Text inside the safe area.
- Checked beside bestsellers in the genre.
Common questions
Why does cover text need to work as a thumbnail?
Most readers first see a cover as a small image on a retailer's search page or a phone, often about 100 to 150 pixels wide, where small text cannot be read.
How big should a book title be on a cover?
Large enough to fill most of the cover's width and stay readable at about 100 pixels wide. Break a long title across lines at natural points, keeping each line large.
How many fonts should a cover use?
One or two: a strong display face for the title, and a simple companion for the author name and tagline.
What text styles does Quillen offer?
17 presets, including Clean white, Bold outline, Soft shadow, Gold gradient, Neon sign, Retro 3D, Glitch echo, Arch title, Wave and Horror, plus fonts, outline, shadow, glow and shape options.
Does Quillen have a thumbnail preview?
Yes. The ebook cover editor has a thumbnail preview that shows the cover at small sizes while you work.