Poster Maker
FreeSplit any image into printable A4/Letter/A3 pages you can tape together into one big poster, with adjustable overlap for easy alignment, entirely in your browser.
Runs entirely in your browser. Your image is never uploaded anywhere.
Click to choose an image, or drag and drop one here
Preview
Recent Activity
Visible to everyone. Last 20 uses across all visitors, newest first.
2×2 pages (A4 (210 × 297 mm)) — 38.0×55.4 cm poster
1 month ago
2×2 pages (A4 (210 × 297 mm)) — 38.0×55.4 cm poster
1 month ago
2×2 pages (A4 (210 × 297 mm)) — 38.0×55.4 cm poster
1 month ago
2×2 pages (A4 (210 × 297 mm)) — 38.0×55.4 cm poster
1 month ago
What this tool does
Poster Maker splits any image into a grid of standard-size printable pages (A4, Letter, A3, Legal, or Tabloid) that you can print, trim, and tape or glue together into one large poster, the same idea as walking up to a print shop for a giant banner, but free, offline, and done in your browser.
How It Works
Each page's usable image area is the paper size minus a margin on every side: usable width = paper width − 2 × margin, and the same for height. That usable size is the fixed step between one page and the next, so the whole poster's physical size is simply columns × usable width by rows × usable height. When you pick a target size instead of a page count, the tool works backwards: columns = ceil(target width ÷ usable width), and rows the same way for height, rounding up to whole pages.
Your image is first cropped to match the poster's aspect ratio (centered, so nothing is stretched or squashed), then each page's tile is cut from that cropped image at the matching physical position, widened by the overlap amount on its right and bottom edges so it shares a printed strip with its neighbors. Effective print resolution is calculated as DPI = image width in pixels ÷ (poster width in mm ÷ 25.4), which is what the low-resolution warning is based on.
Problems it solves
- Printing a large poster, banner, or wall mural using nothing but a normal home or office printer.
- Turning a photo, logo, or piece of artwork into classroom, event, or party decorations at any size.
- Checking, before you print a single page, whether your image has enough resolution to look sharp at the size you want.
- Avoiding a paid print-shop poster order for a one-off or low-budget project.
Frequently asked questions
›How do I print and assemble the poster once I have the PDF?
Print every page at 100% scale / "actual size" (never "fit to page", which would resize each tile differently and break the alignment). Trim the blank margin off each page with scissors or a paper cutter if you turned on crop marks, then line up the overlapping strip on each pair of neighboring pages and tape or glue them from the back.
›What does the overlap setting actually do?
Overlap duplicates a thin strip of image content on the edge of each page shared with its neighbor, printed inside the margin so it doesn't change the final poster size. Lining up that duplicated strip when assembling makes it much easier to get pages straight than trying to butt two blank-edged pages together.
›Why does it warn me about low resolution / DPI?
DPI (dots per inch) here means how many pixels of your source image end up printed per inch of the final poster. A phone photo prints crisply at postcard size but can look soft or blocky blown up to cover a wall. The tool calculates the DPI your chosen poster size would produce and warns below 150 DPI, a common threshold for viewing distance beyond arm's length.
›Should I choose "By page count" or "By poster size"?
Use "By page count" when you know exactly how many sheets of paper you're willing to print and tape together (e.g. a 3×3 grid of A4 sheets). Use "By poster size" when you have a target wall size in mind (e.g. 60×80 cm) and want the tool to figure out how many pages that needs.
›Is my image uploaded to a server?
No. The image is read, cropped, tiled, and turned into the PDF or PNG pages entirely inside your browser using the canvas API. It never leaves your device.
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