Platform preset
XX image resizer
X previews images in the timeline at a wide ratio and expands them on tap. Sizing to 16:9 gives you control over what the preview shows.
Runs in your browser · nothing is uploaded
Ready when you are
Upload your image
Drop an image here
JPG · PNG · WebP · GIF · HEIC (where your browser supports it)
X image sizes
These are the presets the tool above uses, taken from the same configuration.
| Image type | Recommended size | Aspect ratio | Format |
|---|---|---|---|
| X post | 1600 × 900 px | 16:9 | jpg |
| X header | 1500 × 500 px | 3:1 | jpg |
Last verified 2026-01-15 · Source: X Help Center — posting photos
The timeline preview is not the full image
Tall images are cropped to a wide preview in the timeline. If the point of the image is at the top or bottom, it may be invisible until someone taps — resize to 16:9 so the preview is the whole story.
FAQ
Frequently asked questions
- What size should an X post image be?
- 1600 × 900 (16:9) previews cleanly without unexpected cropping.
- What size is an X header?
- 1500 × 500 pixels; your avatar overlaps the lower left.
- Are my images uploaded to a server?
- No. Every step — decoding, cropping, resizing and encoding — runs in your browser using the Canvas API. The image file never leaves your device, so nothing is stored or transmitted by us.
Related tools
- Crop an image to any aspect ratioCrop photos to 1:1, 4:5, 16:9 or any custom ratio right in the browser. Drag to reposition, zoom, and download.
- Resize an image to exact dimensionsResize any JPG, PNG or WebP to exact pixel dimensions in your browser. No signup, no upload, no watermark.
- Compress an imageShrink JPG, PNG and WebP files in your browser. Adjust quality, see the estimated size before you download.
Related guides
Sources & review
Last reviewed 2026-01-15.
- X Help Center — posting photos