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X (Twitter) post image size: 1600 × 900 px

The in-timeline image, at the 16:9 size that survives the feed's own crop.

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Drop images to resize

or click to browse, or paste with Ctrl/Cmd+V — drop several at once to process a whole batch

X (Twitter) post image size at a glance

Why the timeline crops your image and what to do about it

A single image attached to a post is displayed in the timeline at roughly a 2:1 letterbox, and tapping it opens the full frame. So a 16:9 upload is not shown as 16:9 in the feed — the top and bottom are trimmed to fit a wider rectangle, and only people who tap see the whole thing.

1600 × 900 is a good working size because it is large enough that the timeline crop still has plenty of pixels to work with, and small enough to stay well under the 5 MB limit as a JPEG. Uploading much larger gains nothing: X re-encodes anyway.

Compose for the middle band. Put the subject, the headline or the chart's key line in the central half of the frame and treat the top and bottom eighths as bleed. If an image is genuinely tall — a screenshot of a document, a full chart — expect it to be cropped hard in the feed and consider splitting it into two attachments, which are shown side by side instead.

How to resize an image to 1600 × 900

  1. Drop your image on the panel above — or paste it, or drop several at once to do a batch.
  2. The width and height are already set to 1600 × 900, and the aspect lock is off so both numbers are honoured exactly.
  3. If your source is a different shape, crop it to 16:9 first — resizing a different ratio straight to these numbers stretches it.
  4. Pick an output format. JPEG for photographs, PNG for flat colour, text and anything needing transparency.
  5. Download. Nothing was uploaded at any point — the resize ran on your own machine, in this tab.

Questions

Which part of my image shows in the timeline?

Roughly the middle 2:1 band of a single attached image. The full frame appears when someone taps it.

Should I use PNG or JPEG?

JPEG for photographs. PNG only for flat-colour graphics and screenshots with text, where the sharper edges are worth the larger file — and it still has to fit under 5 MB.

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