X (Twitter) Header — 1500 × 500
Your profile photo overlaps the lower left of the header, and the header is cropped vertically on mobile.
Finding the best quality that fits…
- Original
- —
- Result
- —
- Reduction
- —
- Dimensions
- —
How to use this tool
- Select your file, drag it onto the box above, or paste it from your clipboard.
- Processing starts automatically — there is nothing to configure.
- Check the result panel, which shows the original size, the final size and the output dimensions.
- Click Download to save it.
Social platforms crop the same image differently across desktop, mobile and app surfaces. Getting the dimensions right is the easy half; keeping important content out of the crop zones is the half people miss.
The specification
| Dimensions | 1500 × 500 pixels |
|---|---|
| Aspect ratio | 3:1 |
| Maximum file size | 2 MB |
| Formats | JPG, PNG, GIF |
Why uploads get rejected
Meeting the size is only part of it. These are the failures that actually come up:
- Content in the lower left is hidden behind the avatar.
- The file exceeds 2 MB.
How it works
Most compressors pick a fixed quality level and hope for the best, which is why they either overshoot the limit or land far below it and throw away detail you did not need to lose.
This tool runs a binary search instead. It encodes your image at a mid-range quality, measures the resulting file, then narrows the range — higher if there is room, lower if it is over — repeating seven times. It keeps the largest result that still fits. If the lowest quality is still too big, it reduces the pixel dimensions and searches again.
All of it runs on your own device using the browser's canvas API. Nothing is transmitted.
Who uses this
Anyone preparing images for this placement who wants the exact dimensions rather than an approximation that gets cropped or scaled by the platform.
Frequently asked questions
What are the correct dimensions?
1500 × 500 pixels. This tool outputs exactly that.
Why does my image get cropped?
Platforms display the same upload at different ratios depending on the surface — desktop, mobile web, and app all differ. Keep essential content away from the edges.
Does the platform re-compress my image?
Almost always. Starting from a correctly sized, good-quality file gives the best final result, because it avoids a resize stacked on top of a re-encode.
Will the quality drop?
Some quality is always lost when a file gets smaller — that is what compression means. The tool searches for the highest quality that still fits under your limit, so it gives up as little as possible.
Are my files uploaded to a server?
No. Everything runs inside your browser on your own device. Your file is never transmitted and never stored by us. You can confirm this by opening your browser’s Network tab while you use the tool — you will see no upload request.
Is there a limit on how many files I can process?
No. There is no daily cap, no account, and no watermark. Because the work happens on your device rather than our servers, there is nothing for us to ration.
Is this tool really free?
Yes — no account, no trial, no watermark, and no cap on usage. It runs on your own device rather than our servers, so there is no cost for us to pass on.
Does it work on mobile?
Yes. The interface adapts to phone and tablet screens, and everything runs in the browser, so there is no app to install.
Related tools
From other categories
Your files stay on your device. This tool runs entirely in your browser. No file is uploaded, transmitted, or stored. You can verify this by opening your browser's Network tab while using the tool.
Disclaimer. Specifications published by exam boards, governments and platforms change without notice. We verify and date every specification on this site, but you should always confirm against the official source before submitting an application. See our full disclaimer.