Block Poster AI

BlockPoster.ai takes one image and turns it into a block poster: a single large picture divided across ordinary printable sheets, which you print at home and assemble into wall art. Upload a JPG, PNG, WebP or PDF up to 40 MB, or create artwork with the built-in AI generator, then crop it and choose a paper size.

Five paper sizes are available — A4, US Letter, A3, US Legal and Tabloid — in portrait or landscape, with adjustable margins and an overlap so neighbouring sheets repeat a little image detail for alignment. The workspace shows a live preview, the page count and the effective image DPI before you download, and PDF page 1 is an assembly guide.

Ordinary photo uploads and PDF pages are cropped and split locally in the browser. AI generation works differently: prompts and reference images you choose are sent to online generation and safety-check providers, and one successful AI image costs 2 credits.

Free exports are a single-image, multi-page PDF at up to 150 DPI with a small brand watermark and up to 5 sheets across. Paid HD exports are watermark-free, up to 300 DPI and up to 10 sheets across, and add batch ZIP export.