X (Twitter) Image Resizer
Resize
16:9, fills the timeline.
Saves your edited image at its current dimensions, keeping the original file format. The canvas shows exactly what downloads.
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.
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.
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.