X (Twitter) Image Resizer
Resize
16:9, fills the timeline.
Saves the edited image at its current dimensions. JPG, PNG, and WebP keep their format; other supported inputs download as JPG. Check the downloaded file for final quality.
Your images are processed locally in your browser and never uploaded to any server.
X displays 16:9 images edge-to-edge in the timeline. Anything else floats with bars. The header is 1500×500 but mobile crops its top and bottom, so keep text centered. Exact dimensions, processed locally, free.
X moves fast, and an image gets a fraction of a second to earn a pause as someone flicks past. A 16:9 photo that fills the full width of the timeline card commands far more attention than a tall or square image boxed in by grey bars. Sizing to the platform's ratio before you post is a small step that decides how much room your image gets in the one place it has to compete.
How to use the x (twitter) image resizer
- Upload your image.
- Pick the preset: 16:9 (1600×900) for single timeline images.
- Download and attach to your post.
- For headers, verify the middle band contains everything important.
Timeline images versus the header
For posts, use 16:9: 1600×900 is the practical choice because it fills the timeline card edge-to-edge and carries enough resolution to survive X's recompression. The documented in-stream spec of 1200×675 displays identically, so either works, but the larger file tends to hold up better after the platform re-encodes it.
The profile header is a different animal at 1500×500 (3:1), and the mobile app trims its top and bottom to roughly the central strip. Keep any text, logo, or face vertically centred so it is not sliced off on phones, and remember the circular avatar overlaps the lower-left corner, so leave that area clear.
Frequently asked questions
What is the best image size for X posts?
1600×900 (16:9) for a single image. It fills the timeline width. X's documented in-stream spec is 1200×675; both display identically, 1600px simply survives more recompression.
Why does my header look cropped on mobile?
The 1500×500 header is a desktop ratio; mobile shows roughly the central 1500×420 with top/bottom trimmed. Center your content vertically.
Does X compress images?
It re-encodes aggressively, the reason sharp PNG screenshots turn fuzzy. Uploading at exact dimensions with maximum source quality gives the recompression the best input; that is all the control you have.