Vellum enlarges a PDF page and spreads it across several A4, A3 or Letter sheets, to be assembled after printing into a large-format poster — handy without a large-format printer on hand. An adjustable overlap between sheets makes gluing easier, and optional cutting marks show where to trim and how each sheet fits. The computation happens in your browser, with no document sent to a server.
Upload the PDF, choose the sheet format (A4, A3 or Letter) and its orientation, then set the poster size — by scale or by the number of sheets you want. Vellum enlarges the page and splits the result into that many sheets, ready to print and assemble.
Both modes are available. In scale mode, you set an enlargement percentage and the number of sheets needed follows from it. In grid mode, you state directly how many sheets you want across and down, and the scale is calculated so the page fills them as well as possible.
Each pair of neighbouring sheets shares a common strip, whose width is adjustable in millimeters. This overlap zone leaves room to align and glue the sheets together after cutting, without losing content at the join.
They mark the sheet’s position in the assembly grid — the letter for the column, the number for the row — so the poster can be reassembled in the right order without confusion, especially with many sheets.
No, the source page is repositioned at the chosen scale without being turned into an image: text and vector artwork stay crisp at any print size, unlike an enlargement made from a screenshot.
Vellum — free PDF tools whose processing stays on your device.