Rasterbator

Rasterbator lets you convert a single JPG or PNG image into a large‑scale halftone wall poster that you can print on ordinary paper at home. The entire process happens in your web browser, so you never need to register and your picture stays on your device. When you finish, the service delivers a multi‑page PDF or a ZIP archive of JPG tiles that you can print, trim, and tape together to form the final poster.

The tool is useful for hobbyists, teachers, or anyone who wants oversized wall art without ordering a commercial print. You begin by dragging a photo, ideally 12 MP or higher, into the upload area. After the upload, you choose a paper size (such as A4 or Letter), set how many pages wide the poster should be, and pick one of eleven rendering styles. These styles include classic halftone dots, color halftone, black‑and‑white, high‑contrast, and plain tile, each changing how the brightness of the original image is translated into dot size and color. Optional controls let you select dot shapes, enable crop marks, and add page labels, which help you line up the sheets during assembly. When you click generate, Rasterbator creates a PDF that contains every page of the poster arranged at 100 % scale; you then print the file on standard 80 gsm copy paper or a heavier 100–120 gsm stock if you want a more durable result.

Rasterbator also bundles a few helper utilities that prepare the source image before rasterbation. The Image Upscaler can clean a low‑resolution or soft photo, making the dots appear clearer after enlargement. The Image Resizer lets you set exact pixel dimensions or scale the image by a percentage, giving you control over the level of detail that will appear in the final grid. The Wall Planner calculates how many sheets you will need for a given wall size and shows a preview of the layout, which is handy for planning large projects. If you prefer a quick start, the site offers ready‑made templates that pre‑configure paper size and style, so you can generate a poster with a few clicks.