How to Make a Customizable Poster From Size to Finish

Trim size is the decision every other decision hangs off. It sets how many pixels your artwork needs, which stocks the configurator will offer you, and whether the finished piece can be mounted rigid or has to ship rolled.

Pick the size from the viewing distance, not from a list. A poster read from across a room wants 24 by 36 inches. A poster at eye level in a hallway or a shop window works at 18 by 24. A poster next to a counter or a desk is fine at 11 by 17. Event and film posters default to 27 by 40 because that is the size the frames already screwed to the wall happen to be, and fighting that costs more than accepting it.

Then check the file. At 150 dpi, which is what we work back from on posters, 24 by 36 inches needs artwork around 3600 by 5400 pixels. A large poster nobody stands closer than about six feet from survives at 100 dpi. A poster read at arm's length does not, and that is where upscaled web images fall apart along type edges. Our guide to image resolution for printing goes through the arithmetic, and the complete poster size guide lists every standard size with the distance it suits.

If the wall or the frame gives you an odd measurement, enter it as a custom size rather than ordering a standard size and trimming it by hand. The configurator prices custom posters from the area, so a 20 by 30 costs what a 20 by 30 costs, and you avoid the uneven border a craft knife always leaves.

Finish is the choice people make on screen and regret on the wall. The deciding factor is the light in the room, and it beats every argument about how the design looks.

Gloss makes photographs and saturated color snap because the coating reflects light back through the ink. That same reflection turns the poster into a mirror the moment a ceiling downlight or a window lines up with the viewer, and a person standing in the wrong spot reads the room instead of your message. Matte scatters the light, holds legible from every angle, and is the correct default for posters carrying text, prices, schedules, or a dense layout. Order a matte poster unless the piece is essentially one big photograph in soft, controlled light.

Lamination is a separate question from gloss or matte, and it answers durability rather than looks. Add it when the poster will be touched, cleaned, or hung somewhere with moisture: a gym class board, a deli menu, a job site notice, a poster low enough for hands to reach. Laminated posters take fingerprints and a damp cloth without the ink lifting, and the film adds enough stiffness that the sheet stops flapping. Skip it on a promotional poster that gets swapped out monthly, because that job never lives long enough to use the protection.

One thing to check before either finish: your color mode. A file left in RGB shifts on press, most visibly in bright blues and greens, and a poster is large enough to make that shift obvious. Convert before you upload; CMYK vs RGB for printing explains what moves and by how much, and matte vs gloss finishes compared covers how each coating changes the same ink.

The customization is only real once the file matches it. Four things account for nearly every poster that comes back for a reupload.

• Bleed. If any color or image runs to the edge, extend it past the trim line so the cut never exposes white paper. Full bleed printing explained gives the amount and where it goes.
• Safety margin. Keep type and logos well inside the trim. Posters are cut in stacks, and a headline sitting 2 mm from the edge will look off-center on some sheets in the run.
• Built at final size. Set the document to the trim size you ordered rather than designing at half scale and enlarging. Half-scale artwork needs 300 dpi to hit 150 dpi at print size, and most people forget the doubling.
• Fonts outlined, images embedded. Export a print-ready PDF with type converted to outlines so nothing substitutes on our end.

The fastest way past all four is to start from a correctly built file. Our blank template library has the trim, bleed, and safety already drawn for standard poster sizes, and the online design templates let you customize a layout in the browser and send it straight into the order without leaving the site. If you would rather design from scratch, how to design a poster in 8 steps covers the layout side, and the whole poster range sits on the poster printing page.