Carousel Design: 10 Rules for Slides That Read on a Phone
Good carousel design is mostly restraint: one big idea per slide, type large enough to read at arm’s length, two fonts at most, one accent color, the same margins on every slide, and a layout that repeats so the reader only has to read the words. Fancy layouts rarely make a carousel better; inconsistent ones often make it worse. Below are ten rules that hold on Instagram and LinkedIn, font pairings that work, and a checklist to run before you post.
Why does carousel design matter so much?
Because the reader decides in a second. The first slide has to read as a promise at thumbnail size in a busy feed, and every slide after it has to read in a glance on a phone. Good design here is not decoration. It is the reason a reader gets to slide 5 instead of stopping at slide 2.
What are the rules for carousel design?
1. One idea per slide
If a slide needs two ideas, it is two slides. This rule does more for your design than any font. How many slides covers length.
2. Big type, short lines
Headlines should be readable at thumbnail size, body text at arm’s length. If the body runs past five or six short lines, cut words rather than shrinking the type. How much text fits on a carousel slide has limits per slide type.
3. Two fonts at most
One display font for headlines, one body font for everything else. A third font almost always reads as noise.
4. High contrast
Dark text on a light ground or light text on a dark ground. Mid-grey on white, or a color on a color, looks fine on a laptop and disappears on a phone in daylight.
5. One accent color
Use it for the thing that matters on each slide: a number, a keyword, a rule line. If everything is accented, nothing is.
6. The same margins everywhere
Generous, identical padding on every slide. Text that sits closer to the edge on slide 4 than on slide 3 is the first sign of a hand-made carousel.
7. A repeating layout per slide type
Every list slide looks like every other list slide. Every stat slide puts the number in the same place. The reader learns the pattern on slide 2 and reads faster after it.
8. A hook slide that looks different
The first slide carries the promise, so give it the biggest type and the most space. Carousel hook ideas helps with the words.
9. Small signals that help the swipe
Slide numbers, a quiet “swipe” hint on the first slide, your handle in the same corner on every slide. They tell the reader there is more and who made it.
10. A last slide with one job
One ask: save, follow, comment or click. The last slide of a carousel explains why one beats three.
Which fonts work best for carousels?
Pair one display font with a plain body font. Some pairings that hold up on a phone:
| Display font | Body font | Feel |
|---|---|---|
| Inter (heavy weight) | Inter | Modern, direct, works for any topic |
| Instrument Serif | Inter | Editorial, calm, good for essays and quotes |
| DM Serif Display | Inter | Classic, a bit warmer |
| Archivo Black | Inter | Loud headlines, good for hooks |
| Bebas Neue | Inter | Tall, condensed, good for short punchy titles |
These are the display fonts Karou’s templates can use, with Inter as the body font. Avoid thin weights for body text and script fonts for anything longer than a word.
What size and colors should a carousel use?
| Setting | Safe choice |
|---|---|
| Size | 1080 by 1350 (4:5) for Instagram and LinkedIn; 1080 by 1080 for square |
| Ground | Near-black, white or a warm off-white |
| Text | The opposite of the ground, at full strength |
| Muted text | One grey for subtitles and footers |
| Accent | One saturated color, used sparingly |
More on sizes in Instagram carousel size and LinkedIn carousel PDF size.
How do you keep the design the same every week?
Write the rules down once, then let a tool apply them instead of your hands. In an editor, that means a locked master and copies (Canva carousel template shows how). Brand consistency across carousels covers why consistency beats variety.
Karou goes further: the design is a set of settings, so it cannot drift. You connect Karou to Claude, ChatGPT or Cursor, ask for a carousel, and your AI writes the slides and calls Karou. Every slide type has a fixed layout, a type scale picked by text length, and character limits tuned so the smallest size still reads. When a slide runs long, the AI is told how much to cut. The three built-in templates (bold, clean, editorial) follow the rules above; on Pro you set your own colors, fonts, alignment, decoration, handle and footer once, and every render uses them.
What it does not do: photos, illustrations or free placement. If your carousel needs a hand-drawn arrow, use an editor for that one.
What should you check before you post?
- Every slide reads on your phone at arm’s length.
- One idea per slide, nothing cut off at the edges.
- Same margins, same fonts, same accent on every slide.
- The hook slide reads as a promise at thumbnail size.
- The last slide has one ask.
FAQ
What is the best font for an Instagram carousel?
A heavy sans like Inter for headlines and the same family for body text rarely goes wrong, because one family keeps the slide calm. A serif display font works for essays and quotes.
How many colors should a carousel use?
A ground, a text color, one muted grey and one accent. Four is plenty.
Should every carousel look different?
No. The same look every week makes your posts recognizable before anyone reads your name. Vary the ideas, not the design.
Do I need a designer?
Not for text carousels. A fixed template that follows these rules does the job, because the rules are what a designer would give you anyway. Karou’s free plan renders 3 a day with a small watermark; Pro adds your own templates, free for 14 days, then $12 a month or $97 a year.
Start free and get carousels that follow these rules without touching a layout.