For the timeline mosaic
Image splitter for X (Twitter)
Attach four images to a post and the timeline arranges them into a mosaic. Cut one picture into four and the mosaic puts it back together — until somebody taps.
- Runs in your browser
- Free, unlimited
- No watermark
Drop an image here
JPG, PNG, WEBP or GIF. Read by your browser, never uploaded.
Choose an imageor paste with Ctrl / ⌘ + V
Quick templates
Tile shape
Paper
Output format
Your tiles
How it looks in the timeline, before anyone taps
How the layout works
A post with more than one image doesn't show the images, it shows a single card with them arranged inside it, cropped to a wide shape. Because that card is one continuous rectangle, a picture cut into matching pieces reassembles inside it. What people see in the timeline is your whole image; what they get on a tap is the individual files at full size.
| Files | Timeline layout | Split to use |
|---|---|---|
| 2 | Side by side, two tall strips | 2×1 |
| 3 | One tall left, two stacked right | Not a clean split |
| 4 | A 2×2 mosaic | 2×2 |
The upload order
Left to right, top to bottom — the order the tiles are numbered here. Much simpler than a profile grid, where the order runs backwards. Here you just attach them the way you read them.
The card crops your picture
The timeline card is a fixed wide shape, roughly 16:9, so the mosaic gets trimmed top and bottom. Thats not a bug, its the format — the timeline shows a slice and tapping reveals the rest. But it does mean anything that has to be readable belongs in the middle band, not near the edges. The preview under the tiles shows what disappears.
Resolution and format
Images up to 8192 px on a side are accepted and almost everything gets re-encoded. 2048 px per tile is plenty, which is what this page defaults to. PNG is worth using for artwork and text; for photographs JPG at 90% or above is fine and much smaller.
How to split an image for X
- Pick 2×2 for four tiles or 2×1 for a pair.
- Add your picture and drag it so nothing important sits at the very top or bottom.
- Check the timeline preview to see what the card will crop.
- Attach the files to one post, in the order they are numbered.
Questions
What order do I attach the images?
Left to right, top to bottom — the same order they are numbered here. A 2x2 goes top left, top right, bottom left, bottom right.
Why is my post cropped in the timeline?
The multi-image card is a fixed wide shape and your mosaic is trimmed to fit it. Tapping shows the full images. Keep anything readable in the middle.
Can I split an image into 3?
You can, but it won't reassemble. Three attachments are laid out as one tall image plus two half-height ones, and no equal split matches that.
Does the quality drop?
Almost everything gets re-encoded. PNG under about 5 MB survives best, which is why its the better choice for artwork and text.
Does this work on Bluesky, Threads and Mastodon?
The tiles are just image files, so yes. The layouts differ though — each one arranges multiple attachments its own way, so check the result before you rely on it.