How to Print Window Posters That Survive a Sunny Storefront
Match the material to the glass, put it on the right surface, and size the headline to the sidewalk. Here is how a window poster is actually specified, priced and set up.
Print a window poster on the material the glass calls for, not on whatever paper is cheapest. A large format paper poster taped to the inside is right for a two week promotion on a shaded window. A laminated poster, a static cling or adhesive vinyl is what holds its color through a season of direct sun. Front adhesive vinyl is the one exception that needs the artwork mirrored, because its printed face presses against the pane. Perforated vinyl goes on the outside and is the only option you can still see through from inside.
Quick answer
The glass picks the material, the sidewalk picks the type size
A window poster is two decisions: what it is printed on, and which surface of the pane it sits against. Paper for short runs on shaded glass, laminated paper or vinyl for anything that has to hold its color through sun, and perforated vinyl when the view out still matters. Front adhesive material is the only one that needs a mirrored file. Then size the headline at one inch of cap height per ten feet of reading distance and cut the sentence until it fits.
Pick the Material Before You Pick the Size
Four materials cover almost every window job, and the choice comes down to two questions: how long does it stay up, and does anything have to be visible through it.
| Material | Where it goes | Sun on the glass | Coming down | From |
|---|---|---|---|---|
| Large format poster | Taped or framed on the inside | Fades in weeks on a bright side | Tape residue on the glass | $25 |
| Laminated poster | Taped or framed on the inside | Film slows the fading, holds months | Tape residue on the glass | $25 |
| White window cling | Inside face, static grip | Indoor life, reusable | Peels off clean | $25 |
| Clear window cling | Inside face, static grip | Indoor life, reusable | Peels off clean | $30 |
| Front adhesive vinyl | Inside face, glue against the glass | Rated for a season outdoors | Scraper and solvent | $25 |
| Perforated window vinyl | Outside face of the pane | Rated for a season outdoors | Scraper and solvent | $30 |
Read the third column before the last one. The cheapest option on this table is also the one that looks tired first, and a poster that has visibly faded reads as a shop that stopped paying attention. For a two week sale on a north facing window, plain paper is the right answer and spending more is waste. For a lease sign, a menu board or a seasonal campaign that has to hold from November to January, the extra few dollars for lamination or a cling buys the whole run.
If you are still weighing stocks in general rather than for glass specifically, our breakdown of which poster material to use covers the same materials away from a window, and the posters printing category lists every size and finish we run.
Which Side of the Glass, and When to Mirror the File
This is the step that produces reprints. A window has two surfaces, and the material tells you which one it belongs on.
Inside, print facing the street. Paper posters, laminated posters and static clings go on the inside surface with the printed side turned outward, so the shopper sees the front of the sheet directly through the pane. Nothing is flipped. The back of the sheet faces the shop, which is why staff inside see white paper and why a second poster is needed if the message has to read both ways.
Inside, glue against the glass. Front adhesive vinyl is the one that catches people. The adhesive is on the same side as the print, so the printed face is pressed flat against the pane and viewed through the glass. That means the file must be flipped horizontally before it goes to press. Every letter, every logo, every phone number. Order it unmirrored and it reads backwards from the sidewalk with no fix short of reprinting.
Outside. Perforated window vinyl goes on the exterior surface, print outward, unmirrored. It is the only one on this page that has to survive rain and hands, which is why it uses an outdoor adhesive rather than static.
If you are choosing between the static and adhesive families, clings versus decals lays out the grip, the reuse and the removal side by side, and the perforated window vinyl guide explains why the hole pattern reads solid from a distance.
Sizing a Window Poster for the Pane and the Sidewalk
Two measurements set the size, and they pull in different directions. The pane sets the maximum. The reading distance sets the minimum type.
Start at the glass. Measure the clear opening inside the frame, not the frame, then take about an inch off each dimension so the sheet does not buckle against the mullion or catch on a bead of sealant. Most storefront panes take 24 by 36 inches without argument, and 18 by 24 inches is the usual size for a door panel or a narrow side light. Large format posters can be cut to a custom size, so an awkward pane is better matched than centered with uneven margins around it.
Now the sidewalk. The signage rule that holds up is one inch of capital letter height for every ten feet of viewing distance. Someone reading from the far edge of the sidewalk, roughly thirty feet away, needs a three inch headline. That single number usually decides the whole layout, because a three inch cap height on a 24 inch wide sheet leaves room for about five or six words and nothing else. Cut the sentence, not the type size.
Everything below the headline is for the person who has already stopped, so set it at a size that works from three or four feet and stop worrying about it. Build the file at full size with the bleed and safe margin the blank template library supplies, and if you want the sizing conventions in full, the large format poster size guide lists the standard dimensions with their common uses.
Daylight Behind the Poster, and Glare in Front of It
A poster on a wall is lit from the front. A poster in a window is lit from behind for most of the day, and that changes what the print looks like.
Daylight coming through the shop from the back of the store, or through the poster itself on a bright morning, washes out midtones and turns thin dark type grey. The fix is opacity, not more ink. A heavier poster stock blocks more light than a thin one, and a white window cling or white adhesive vinyl has an opaque base built in, which is exactly why seasonal window graphics are usually printed on white film rather than clear. Clear material is for the effect of type floating on glass, not for a dense image you need to hold its color.
The opposite problem is glare on the outside of the glass, worst on a west facing shop in the late afternoon. A gloss laminate on the poster adds a second reflective surface and can make the whole thing unreadable at exactly the hour the sidewalk is busiest. Matte is the safer finish behind glass. If the poster has to read from inside the store as well as outside, print two and mount them back to back rather than hoping one sheet shows through, because a single sheet viewed from behind is dim and reversed.
Windows next to a lit interior sign or a menu board have their own balancing act. Our restaurant signage guide covers how window, door and wall pieces work together, and liquid laminate on digital prints explains what coating actually does to a printed sheet before you order it on a poster.
Wally explains window posters
Right material, right side of the glass, right size headline
Wally checks which way the window faces before he picks anything. Shaded glass and a two week sale, he tapes up a paper poster. Afternoon sun and a three month campaign, he goes laminated or moves to a cling. If the shop still needs to see the street, he puts perforated vinyl on the outside. And when the job is front adhesive vinyl he flips the file first, because the print goes face down on the glass and unmirrored art reads backwards to everyone walking past.
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Common Questions
Your window poster questions, answered
What is the best material for a poster in a shop window?
It depends on how long it has to live there and which way the glass faces. For a promotion that runs a week or two on a shaded window, a large format paper poster taped to the inside is the cheapest thing that works, from $25. For anything running a full season, or on glass that gets direct afternoon sun, move to a laminated poster from $25, or to a window cling from $25 for white and $30 for clear. If the window has to stay see-through from inside, perforated window vinyl from $30 is the only one of the four that does that.
Do I have to mirror my artwork for a window poster?
Only for front adhesive material. Front adhesive vinyl goes on the inside surface of the glass with its printed face pressed against the pane, so the shopper reads it through the glass and the file must be flipped horizontally before printing. Everything else, including paper posters, static clings applied to the inside face and perforated vinyl applied outside, prints and reads the normal way round. If you are unsure which one you ordered, ask before the file goes to press, because a mirrored reprint is a full reprint.
How long will a poster last in a sunny window?
Uncoated poster paper behind glass on a south or west facing storefront starts losing its reds and yellows within weeks, and the paper itself yellows and curls with the daily heat cycle. Laminating slows that down noticeably because the film carries a UV barrier and stops the sheet from cockling. Vinyl films are built for exterior signage and hold a season comfortably. If a poster has to look new on the last day of a three month campaign, do not print it on plain paper.
Will a window poster block the view out of my store?
A paper poster, a white cling and white adhesive vinyl are all opaque, so yes, they black out whatever they cover. That is a real cost in a small shop where the window is also the daylight. Perforated window vinyl solves it: the pattern of small holes lets people inside look out and lets light through, while from the street the printed side reads as a solid image. The trade is that the halftone sits on top of a perforated surface, so fine text under about half an inch of cap height gets ragged.
What size poster fits a storefront window?
Measure the clear glass inside the frame, then subtract about an inch on every side so the sheet is not wedged against the mullion. Most storefront panes take 24 by 36 inches comfortably, and 18 by 24 inches is the common size for a door panel or a smaller side light. Large format posters can be ordered at custom dimensions, so if the pane is an awkward size it is usually better to print to the pane than to center a stock size and leave uneven margins.
Can I reuse a window poster next season?
Clings yes, adhesive no. A static cling peels off, goes back in its backing sheet or between two sheets of paper, and holds again next year as long as you keep it flat and clean the glass before it goes back up. Adhesive vinyl is a one way trip: the glue bonds, and getting it off a large pane means a scraper, patience and usually a solvent. A taped paper poster survives one removal if the tape is on the border rather than the image.
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