For most brands running paid social, the click comes from a phone. Check your own analytics by device to see your split, but plan for this person: phone in one hand, inside the Instagram, Facebook, or TikTok app, half paying attention.
That visitor won't pinch to zoom, hunt for a button, or wait for a giant video to buffer. A page that looks great on a large monitor in a design review can fall apart in that context. These rules are about designing for the way paid social visitors actually arrive.
1. Make the first screen carry the pitch
The first screen on a phone is small, and the in-app browser's own toolbar takes a slice of it. Whatever fits in the rest is the whole pitch for anyone who doesn't scroll.
Get the headline, a clear product image, the offer, and the main button (or at least the top of it) into that space. Things that commonly eat the room instead:
- Stacked announcement bars and a tall logo header
- A lifestyle hero image where the product is small or missing
- A headline so large it wraps onto five lines
For what belongs below that first screen, see the anatomy of a landing page built for paid social.
2. Put the buy button where the thumb is
Held in one hand, a phone's bottom edge is easy to reach and the top corners take a stretch. Put the action where the thumb already is.
- Add a sticky add-to-cart bar at the bottom that shows the price and a button. Show it once the main button scrolls out of view.
- Handle variants properly. If the product has sizes or colors, tapping the sticky button should open the selector or scroll to it, not fail silently.
- Keep primary buttons wide. Full-width buttons are easier to hit than small centered ones.
3. Make tap targets big and well spaced
Size swatches, quantity steppers, accordion toggles, and the add-to-cart button all need to be easy to hit without hitting the thing next to them.
Apple and Google both publish minimum touch target sizes in their design guidelines. Use those as a floor, and add spacing between adjacent targets. If you've ever tapped "S" and gotten "M," you've felt what cramped swatches cost.
4. Use type people can read without zooming
- Body copy large enough to read at a normal distance, with comfortable line spacing.
- Strong contrast. Light gray text on white disappears outdoors and on dimmed screens.
- No important text baked into images. It can't reflow, it shrinks on small screens, and screen readers can't read it.
- Form fields with large enough text. On iPhones, tapping into a field with small text makes the page zoom in, which is disorienting in the middle of a purchase.
5. Keep images light
People on paid social are often on cellular data, not office Wi-Fi. Serve images at the size the phone actually displays, compress them, and use modern formats. Lazy-load images below the fold, but not the hero image, which should load first.
Autoplay hero videos deserve extra suspicion. If one is slowing the first screen down, move it lower or replace it with a still image. Page speed for paid traffic covers the full priority list.
6. Don't cover the offer with pop-ups
The visitor tapped an ad that promised something. If the first thing they see is a full-screen email pop-up, that promise is hidden behind a form.
- Delay or turn off email capture pop-ups on paid landing pages, or use a small banner that doesn't block the product.
- Check for collisions. Chat bubbles, cookie banners, and sticky bars often pile up at the bottom of the screen and hide the buy button.
- Make every overlay easy to close, with a close button big enough to tap on the first try.
7. Plan for the in-app browser
When someone taps your ad inside Instagram, Facebook, or TikTok, the page usually opens in the app's built-in browser rather than Safari or Chrome. That changes a few things:
- They're probably not logged in to your store, even if they have an account.
- Saved passwords and autofill from their main browser may not carry over.
- Their cart may not follow them. If they leave and come back later in their regular browser, the cart they built inside the app can be gone.
This is why accelerated checkouts matter so much for paid social. Shop Pay, Apple Pay, Google Pay, and PayPal let people pay without typing a card number and address on a small keyboard. Which of those buttons appear can vary by app, device, and settings, so check them on real phones.
Allow guest checkout, and keep any forms on the page short. Every field you remove is one less thing to type with a thumb.
8. Test on real phones, inside the real apps
Your desktop browser's device mode is a fine first check. It won't show you the in-app browser, a slow cellular connection, or how a mid-range phone handles your page.
Before you launch:
- Get the ad onto your own phone. Use your ad platform's preview options, then tap through from inside the app.
- Test on an iPhone and an Android phone, including one that isn't a current flagship.
- Turn off Wi-Fi and load the page on cellular.
- Walk all the way to checkout. Pick a variant, add to cart, and reach the payment step. Note every spot where you hesitated.
- Check pop-ups and overlays in each app, since they can behave differently than they do in a desktop browser.
The short version
- The first screen on a phone has to carry the headline, product, offer, and button.
- Keep the buy button in thumb reach with a sticky bar that handles variants.
- Use big tap targets, readable type, and light images.
- Don't cover the offer with pop-ups, and watch for overlays stacking up.
- Visitors arrive in in-app browsers without their logins or saved details, so accelerated checkout matters. Test all of it on real phones.