Is this only for Facebook Marketplace?
No. It uses the same root collage builder, but opens with square marketplace-oriented defaults and page copy tuned for that use case.
Can I still use other layouts?
Yes. The square collage layout is simply the starting point. The normal layout controls remain available in the editor.
Does the file stay on my device?
Yes. The full preview and export flow stays local in the browser, and the saved file is rebuilt through canvas so common metadata is stripped on save.
Should a collage be my first Marketplace photo?
No. The browse grid crops to a square tile that renders at a couple of hundred pixels on a phone, so a four-panel collage would give each item about 100 pixels. Lead with one clear photo of the item and put the collage later in the set.
What size collage works on Marketplace?
Square. The four-grid and five-showcase layouts export at 1600 x 1600, which matches the 1:1 crop the grid applies and clears Meta's 1024 x 1024 recommendation.
When is a collage actually useful on Marketplace?
For bundles and clearances. If you are selling a set of garden tools or a box of baby clothes, one six-panel grid shows the whole lot in a single image rather than making the buyer swipe through ten photos to find out what is included.
Can I put the price on the collage?
Not with this tool, and it is a bad idea anyway. The price lives in the listing field, and a price burned into an image goes stale the moment you accept an offer.
How many images can I combine?
Up to six, each under 12 MB, in PNG, JPG, WebP, GIF or BMP.