What is the X (Twitter) header size?

1500x500 pixels, a ratio of 3:1. X crops it the same way on every device but shows less of the height on a phone, so treat the middle as the part you can rely on.

What if my image is not 1500x500?

It is scaled to the band width and the middle of the height is kept. Nothing is refused, but a tall picture is reduced to a strip through its centre.

Is my image uploaded when I check it?

No. The file is opened by your own browser, measured, and forgotten when you close the tab. It is never sent to us, so there is nothing on our side to keep, leak or delete.

Why is my X header cut off?

Because the slot is three to one and almost nothing you photograph is. X fills the width and keeps the middle of the height, so a standard phone photo loses well over half of itself. Either crop it deliberately first or build the header at its own size.

Yes. This tool does its work in your browser, so whatever you type, paste or upload stays on your device. Nothing is sent to our servers, which is also why it keeps working if you go offline after the page has loaded.

Yes. Every tool here is free with no account, no credit card and no usage cap. They exist so that the people who need our scheduling product find us, which only works if the tools are genuinely useful on their own.

Do I need an account?

No. Open the page and use it. An account is only for OctoSpark itself, where you plan, schedule and publish a whole calendar rather than fixing one post at a time.

Can I use the output commercially?

Yes. Anything you produce here is yours, including for client and commercial work. We claim no rights over it and we do not watermark it.

OctoSpark

Free tool — runs in your browser

X (Twitter) header size

The X (Twitter) header size is 1500x500 pixels, a ratio of 3:1. Check yours in the browser and see what the avatar circle takes out of the bottom left corner.

Every X (Twitter) header size

Every X (Twitter) header size, with its pixels, its ratio and what it is for.
Where it is used	Pixels	Ratio	What the number is for
Profile header	1500x500	3:1	The band across the top of your profile.
Profile photo	400x400	1:1	Drawn as a circle over the lower left of the header.
Post image, for comparison	1600x900	16:9	The in-feed image, and far taller in proportion than the header is.

Check an image you already have

Check it against

Choose an imageIt is measured on this device and never uploaded.

Choose a file and this says whether it fits, and what gets cropped if it does not.

Resize it to these pixels

Every X (Twitter) header size, in pixels

The header on X is a wide, shallow band with your avatar punched into its lower left, and it is the only image on the profile a visitor sees before deciding whether to read anything at all.

Profile header: 1500x500px, a ratio of 3:1. The band across the top of your profile.
Profile photo: 400x400px, a ratio of 1:1. Drawn as a circle over the lower left of the header.
Post image, for comparison: 1600x900px, a ratio of 16:9. The in-feed image, and far taller in proportion than the header is.
The header is three times wider than it is tall, so a photograph cropped into it keeps a horizontal third of itself and loses the rest.
Your profile photo overlaps the header, and on a phone the name and bio sit close underneath, which leaves the right two thirds as the dependable area.
The header is cropped harder on a phone than on a laptop, and that is where an edge-to-edge design comes apart.
JPG, PNG and GIF are accepted up to 5 MB for a header, which is more headroom than the 2 MB the profile photo gets, and an animated GIF is shown as a still frame either way.

Check a file you already have against the X (Twitter) header size

A header is one of the few images where people knowingly use a photograph that does not fit and hope for the best. The check tells you what share of the height disappears before you upload it and find out.

Pick the target first. This page carries 3 X (Twitter) header sizes, and a verdict only means something against one of them.
Choose your image. It is opened by this browser tab and measured on a canvas, so the file never leaves the machine you are sitting at and there is no queue or upload to wait for.
Read the result: an exact match at 1500x500, the same 3:1 shape at a different scale, or a crop with the axis that loses pixels named.
If it is wrong, open the X resizer linked underneath. It exports to these exact numbers instead of leaving the decision to the platform.
If the picture is one you like whole, try it as a post image instead and give the header a flat colour.

What X does when the shape is wrong

X scales a header to the band width and keeps the middle of whatever height is left, so an ordinary photograph arrives as a slice through its centre with no say from you about which slice.

A portrait photograph loses its top and bottom entirely, which in practice means the face and the feet.
A logo in the lower left is hidden by the avatar at every screen size, and that overlap does not appear in the upload preview.
A small file scaled to the band width goes soft, and the header sits directly above a sharp avatar where the difference is easy to spot.

A header is a background, not a billboard

The common mistake here is asking too much of a band three times wider than it is tall. It sits behind an avatar, a name, a bio and a follow button, and it works best when it is not competing with them.

Flat colour or a soft texture reads at every crop and never fights the text in front of it.
If there are words, put them on the right and keep them short, because the left is spoken for by the avatar.
A header is seen by people who came to your profile deliberately, which is a smaller and warmer audience than the timeline. It does not have to sell anything.

The rest of the job

You just fixed one post. Now do the month.

The x (twitter) header size solves one piece of one post. OctoSpark plans, writes and schedules the whole calendar across every network you use, publishes it for you, and reports what actually performed.

One calendar for every network
Schedule once, publish everywhere
Drafts written in your own voice
See what actually performed

Open the full sign-up page

No card needed. These tools stay free either way.

Frequently asked questions

How this tool works, what it cannot do, and what happens to what you put into it.

What is the X (Twitter) header size?
1500x500 pixels, a ratio of 3:1. X crops it the same way on every device but shows less of the height on a phone, so treat the middle as the part you can rely on.
What if my image is not 1500x500?
It is scaled to the band width and the middle of the height is kept. Nothing is refused, but a tall picture is reduced to a strip through its centre.
Is my image uploaded when I check it?
No. The file is opened by your own browser, measured, and forgotten when you close the tab. It is never sent to us, so there is nothing on our side to keep, leak or delete.
Why is my X header cut off?
Because the slot is three to one and almost nothing you photograph is. X fills the width and keeps the middle of the height, so a standard phone photo loses well over half of itself. Either crop it deliberately first or build the header at its own size.
Is my data private?
Yes. This tool does its work in your browser, so whatever you type, paste or upload stays on your device. Nothing is sent to our servers, which is also why it keeps working if you go offline after the page has loaded.
Is this really free?
Yes. Every tool here is free with no account, no credit card and no usage cap. They exist so that the people who need our scheduling product find us, which only works if the tools are genuinely useful on their own.
Do I need an account?
No. Open the page and use it. An account is only for OctoSpark itself, where you plan, schedule and publish a whole calendar rather than fixing one post at a time.
Can I use the output commercially?
Yes. Anything you produce here is yours, including for client and commercial work. We claim no rights over it and we do not watermark it.