Resize an Image for X (Twitter) Post Image
1600 × 900 pixels — the exact size X (Twitter) Post Image expects.
The dimensions
1600 × 900 pixels, an aspect ratio of about 1.78:1. 16:9 at 1600 pixels wide is displayed without cropping in the timeline.
Crop, and what you will lose
Uploading anything narrower than 1200 pixels risks upscaling in the timeline, which is visible as softness on a high-density display.
Why 1600 rather than 1200
X stores an attached image at up to 1600 pixels on the long edge and serves a scaled version to each device. A 1200-pixel upload is fine on a standard laptop and visibly soft on a high-density phone display, because the timeline requests a larger rendition than the file contains. Sending 1600 pixels costs a little more bandwidth on upload and nothing on download, since the platform resizes for every viewer anyway.
How to crop it here
Selecting cover scales your image uniformly until it fills the 1600 × 900 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) Post Image preset, or type 1600 and 900 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 1600 × 900 pixels, ratio 1.78:1.
- Used for images attached to a post.
- 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 1600 pixels wide.
- Platforms change their internal dimensions without notice; these are current published figures.