Poster Maker

No. Your browser opens the file from your disk and draws it onto the canvas in the page. The PNG is written by the same canvas. Nothing about your poster goes over the network.

No. Each layout has fixed positions and you fill them in. If a line is too long for its space the size drops until it fits, but the box stays where it is. If you need to place things freely, this is the wrong tool: you want a real design editor.

The ones already on your computer: the system sans and serif. Nothing is downloaded from a font service, so the same poster can look slightly different on someone else’s machine.

For a window sign or a noticeboard, yes: 1080 pixels across is about A5 at 150 dpi, or A6 at 300. For anything that goes to a printer as a proper job, it is too small.

Four are free and complete: same size, no watermark, no limit on how many you make. The rest are held back for a paid pack that is not on sale yet. The free four will not change when it is.

PNG, JPEG, WebP and GIF. An iPhone HEIC photo is not on that list, so convert it with the HEIC to JPG tool on this site first. A very large image can run your browser out of memory; if that happens the page says so, and a smaller copy of the same photo will work.

Yes, within limits. You pick one of six colour sets: Night, Paper, Blue, Green, Pink, or Black and white. The highlight colour on top of that can be set to any colour you like with the colour picker. For lettering there are two choices, plain or serif. You cannot colour each line separately or load a font of your own.