Resize an Image for X (Twitter) Header
1500 × 500 pixels — the exact size X (Twitter) Header expects.
The dimensions
1500 × 500 pixels, an aspect ratio of about 3.00:1. A 3:1 banner whose visible portion shifts between desktop and mobile.
Crop, and what you will lose
The profile picture overlaps the lower-left corner of the header, so nothing important should sit there.
Leave the lower left alone
The header occupies the full width of the profile, and the circular profile picture overlaps its bottom-left corner by roughly 100 pixels. On mobile the visible band narrows further toward the centre. The practical rule is to place a logo or a wordmark in the upper middle and treat the bottom-left quadrant as space that will be covered.
How to crop it here
Selecting cover scales your image uniformly until it fills the 1500 × 500 rectangle, then trims the overflow from the centre. Contain would leave empty bands instead, which is wrong for an image meant to fill a frame, and stretch would distort faces.
Why this runs in your browser
The file is read from your disk by the browser, decoded with the browser's own codecs, and re-encoded in this tab. No upload request is made, nothing is queued on a server, and closing the tab leaves no copy anywhere. You can verify this in the network panel while it works.
How to use it
- Drop the image on the drop zone.
- Choose the X (Twitter) Header preset, or type 1500 and 500 directly.
- Set cover mode so the frame is filled without distortion.
- Check the crop keeps the subject centred, then download.
Worth knowing
- Target dimensions are 1500 × 500 pixels, ratio 3.00:1.
- Used for profile banner.
- Cover fills the frame and crops the overflow; contain letterboxes instead.
- Aspect ratio is preserved in every mode except stretch.
Limitations
- Cropping is from the centre — frame the photo before uploading if the subject is off-centre.
- Upscaling beyond the original size adds no detail.
- Very small sources will look soft at 1500 pixels wide.
- Platforms change their internal dimensions without notice; these are current published figures.