What size should an X (Twitter) post be?

For photos in posts, 1200 × 675 pixels (16:9) displays in full on both desktop and mobile; 1600 × 900 also works. Photos can be up to 5 MB, and this page applies that cap as well.

How do I get exactly 1200 × 675 without stretching my photo?

Crop first, then resize. Open the crop editor, set a custom ratio of 16 : 9, position your subject and apply — the resize then lands on exactly 1200 × 675 with no distortion. With the aspect lock on and no crop, the photo is fitted inside 1200 × 675 instead, which keeps its proportions but won't fill the frame.

Does X crop images in the timeline?

Images with unusual proportions can be cropped in the timeline preview and shown in full once opened. A 16:9 image avoids most of that.

Is my image uploaded to a server?

No. The whole process runs in your browser using the Canvas API, off the main thread in a Web Worker. The file never leaves your device, so there is nothing for us to see, store or delete.

Resize Image for X (Twitter) post (1200×675) — Free

How images are shown in a post

A single image in an X post is shown at a 16:9 shape in the timeline, and 1200 × 675 pixels is a good working size, with a limit of 5 MB. The timeline previews the image cropped to fit, and tapping it shows the full picture. So the preview is what people see first, and the part of the image that stays inside the 16:9 frame is what has to carry the message.

Resizing for a post

Drop your image on this page. The 1200 × 675 size is already selected and the 5 MB limit applied.
Crop to 16:9, with the main subject and any text inside the frame.
Download and attach it to your post.

Making the preview work

Put the subject near the middle. The preview crops from the centre, so edges can be lost.
Use large text. Small type is unreadable in a timeline.
Mind the corners. The platform may overlay small icons on a corner of the picture.
Use a landscape original. A tall image will be cropped to a thin band in the preview.

Image rules on social platforms change often. If the exact result matters, for example for an ad, check the platform’s own documentation. For a profile header, see X header, and see the X image size guide for more formats. To keep files small, compress to 500 KB.