X Header Image: What to Put on Your Banner

Most people on X spend an hour on their bio and ten seconds on their header image. That is a mistake. Your X header image is the biggest thing on your profile, and it is the first thing a new visitor sees after they tap your name.

Think about how people find you. They read one good reply. They tap your name. Now they have about three seconds to decide if you are worth a follow.

Your banner fills the top third of that screen. If it shows a blurry sunset or a default blue box, you just wasted the best space you have.

So what should go there? I will get to the exact layout. First, the size rules, because a good idea in the wrong size still looks broken.

The X header image size that does not get cut off

X recommends a header of 1500 x 500 pixels. That is a 3:1 ratio, so the image is three times wider than it is tall. X supports JPG, PNG, and GIF files, and its help center suggests keeping the file under 2MB.

But the size is only half the story.

X places your profile photo over the bottom left corner of the banner. It may also cut a little from the top and bottom, depending on the phone, screen, or browser.

So treat the banner like this:

• Bottom left: dead zone. Your profile photo covers it. Put nothing important here.
• Top and bottom edges: risky. They may get trimmed.
• Center band: safe. Put your main message here.

A simple test: after you upload, open your profile on your phone and on a laptop. If any word is cut or hidden behind your face, move it.

What your banner should say in one glance

Here is the question your header must answer: "What do I get if I follow this person?"

Your bio answers it in words. Your banner answers it in a picture and a few big words. They should agree. If your bio says you write about cold email for SaaS founders, your banner should not show a mountain.

I like a simple formula. One short line of text, plus one visual proof.

The line. Five to eight words. Say what you post about or who you help. For example:

• "Daily notes on building a $10k MRR app"
• "Cold email that books calls, tested weekly"
• "Design tips for non-designers"

The proof. Something that shows you are real. A screenshot of your product. A chart of your real growth. Your newsletter name. A photo of you at work.

That is it. You do not need five logos and a quote.

Three header layouts that work for builders

Not sure where to start? Pick one of these. Each one is easy to make in a free design tool in under 30 minutes.

1. The promise banner

Plain background in one or two colors. Your one line of text in large letters, center right. Nothing else.

This works well if you are new and have no product yet. It tells people what to expect from your posts. Clear beats clever.

2. The product banner

A clean screenshot of your app on the right side. A short line on the left side, above the profile photo zone, that says what it does.

This is a good fit for indie builders and founders. People on X like to see real work. A real screen feels more honest than a stock photo.

3. The progress banner

A simple chart or number that shows your public progress. For example, your monthly revenue, your user count, or "Day 120 of building in public."

If you share your numbers on X, this ties your profile to your posts. You can update it each month, which also gives you a small excuse to post about the change. If you build in public, this founder playbook for building in public on X pairs well with this layout.

Small details that make a banner look cheap

A good idea can still look weak. Watch for these:

• Tiny text. Most people see your banner on a phone. If you need to zoom to read it, it is too small.
• Too many words. A banner is not a landing page. Keep it to one line.
• Low contrast. Gray text on a light gray background disappears. Use dark on light or light on dark.
• Old info. A launch date from last year tells visitors you stopped caring.
• A busy photo behind text. If you use a photo, add a solid block of color behind the words.

One more thing. Your banner and your profile photo sit side by side. If both are loud and colorful, they fight each other. Let one be calm.

Make the banner, bio, and pinned post work as a team

Your header image does not work alone. A visitor's eyes move in a simple order: banner, photo, name, bio, then your pinned post.

Each part should push the same message a little further.

The banner states the promise. The bio adds who you are and why you are worth hearing. The pinned post proves it with your best work.

If you have not set those two up yet, start with how to write an X bio that gets follows and then pick a strong pinned post on X. Then design the banner last, so it matches what they say.

And then the profile has one more job: the posts below it have to keep the promise. If your banner says "daily notes on building" but your last post was three weeks ago, the visitor leaves.

This is where a steady posting rhythm matters more than a pretty design. PostOwl helps here: it learns your voice from posts you already wrote, then drafts and schedules X posts and replies that still sound like you. So your profile stays active even on busy weeks.

Your 20-minute task for today

Open your X profile on your phone right now. Look at the banner for three seconds, as a stranger would.

Ask one question: can I tell what this person posts about?

If the answer is no, make a 1500 x 500 image with one line of text in the center and one piece of proof. Keep the bottom left empty. Upload it, check it on two screens, and you are done.

It is the cheapest profile upgrade on X. And it works every time someone taps your name.