How to prepare images for large format printing. Resolution by viewing distance, bleed, colour mode, formats — and the four reasons files actually get rejected. Two minutes here saves a revision cycle.
The counterintuitive rule first: the bigger the print, the lower the resolution it needs. Nobody reads a banner with their nose against it.
Match resolution to
viewing distance, not to size.
Large format printing resolution is the single most misunderstood thing in this trade. People assume a bigger print needs a bigger file. It's the opposite — what matters is how far away the eye will be, and bigger things are looked at from further away.
| Seen from | Typical job | Target | What that means in pixels |
|---|---|---|---|
| Arm's length | Menu boards read up close, small posters, exhibition panels | 150–300 ppi | A 24 × 36″ poster at 150 ppi is 3,600 × 5,400 px |
| 3–6 feet | Posters, window vinyl, trade-show walls | 100–150 ppi | A 4 × 8′ wall at 100 ppi is 4,800 × 9,600 px |
| 10–20 feet | Banners, site signs, murals | 50–100 ppi | A 2 × 4′ banner needs only ~4,800 × 2,400 px |
| Across a lot | Building signs, billboards | 15–50 ppi | Billboards print at resolutions that look broken in your hand |
The arithmetic, once
Pixels ÷ inches = ppi at that size. A 3,000 px wide photo printed 10 inches wide is 300 ppi; the same file printed 60 inches wide is 50 ppi. Nothing about the file changed — only what you asked it to cover. This is why "it's a high-resolution photo" is not an answer: high resolution at what size?
Work backwards instead. Decide the finished size, pick the row in the table above, multiply. If your file doesn't reach it, you have three honest options: print it smaller, find a bigger original, or accept the softness because it's a banner seen from a road and nobody will ever notice.
Print is dots — which is why this works
Continuous tone is a lie print tells with a halftone screen. A printed image has no smooth gradients in it at all; it has dots of varying size that your eye merges at distance. The surface below is drawn at that logic — the decal printing onto its liner is a halftone screen, and the further you sit from your monitor the more it resolves into a picture. Every resolution decision on this page is really a decision about how far away the merging happens.
Print is dots · lean back from your screen and the halftone becomes an image — that's the whole mechanism
Three more things,
then you're done.
Bleed and safe margins
Bleed is background art extended past the trim line — 0.125″ is standard — so that a slight drift in cutting never leaves a white sliver at the edge. Safe margin is the opposite: keep type and logos at least an inch inside the trim on rigid signs, more if a frame, lip or hem will cover the edge. Our free templates draw both lines for you, in colours that mean the same thing on every file.
Banners are the exception and catch people out: no bleed, because they are hemmed rather than cut. Build to the outer edge and let the hem fold back over it.
Colour: CMYK, RGB, and what happens in between
Presses print in CMYK. Screens display in RGB, and RGB can express colours — the electric blues, the fluorescent greens — that no ink can reproduce. Something has to give, and the question is only whether you control it or the printer does at the last second.
- If your software does CMYK (Illustrator, InDesign, Affinity, Photoshop) build in CMYK and you'll see roughly what you get.
- If it doesn't (Canva, Figma, Office, most web tools) send RGB. We convert on a calibrated profile, which is much better than an uncontrolled conversion at output.
- If brand colour is critical, give us the Pantone reference and say so. We'll match as closely as the material allows and tell you honestly where it can't go — a colour on coated stock and the same colour on matte banner vinyl are not the same colour.
- Screen content stays RGB. Menu boards and digital signage never convert.
Formats: vector first, always
Vector — PDF, AI, EPS, SVG — is maths, not pixels. It scales to any size with zero loss, which is why logos and type should always arrive this way, and why the laser-cutting surface above can cut a file at any size at all. Raster — TIFF, PNG, maximum-quality JPEG — is pixels, and belongs to photographs. Send those at the table's resolution for your final size.
Two practical notes. Outline your fonts or send them with the file, or your careful typography becomes whatever we happen to have installed. And flatten transparency if your software warns about it — unflattened effects are the most common source of a proof that looks subtly wrong in one corner.
Four reasons a file gets sent back.
Not to be difficult — because printing it would waste your money. Preflight happens before anything runs, so you hear about problems while they're still free to fix.
Too few pixels
The file can't reach the resolution its final size needs. We'll tell you the largest size it can hold, and you decide whether to shrink the job or find a better original.
No bleed
Background stops exactly at the trim line, so any cutting drift shows white. Usually a two-minute fix in the original file — or start again from a template.
Type in the trim
Text sits where a cut, a hem, a grommet or a frame lip will eat it. Common on banners, because people forget the hem folds over their artwork.
Logo lifted from a website
A 400 px logo pulled off a web page cannot be a 4-foot sign. We'll ask for the vector original, or quote redrawing it — which is normal shop work, not a telling-off.
If any of this reads as noise, upload what you have anyway. File triage is part of the job. The proof will show you exactly what your art can hold, and you can decide from there — that's what a proof is for.
File prep, answered.
Match resolution to viewing distance at final printed size: roughly 150–300 ppi for pieces read at arm's length, 100–150 ppi for posters and window vinyl seen from a few feet, 50–100 ppi for banners and site signs, and 15–50 ppi for building-scale work. Resolution requirements go down as size goes up, because viewing distance goes up with it.
Often yes. A modern phone photo is around 4,000 px on the long edge, which is comfortably enough for a 4-foot banner at 80–100 ppi seen from across a parking lot. It is not enough for a wall mural people stand next to. Shoot in the best quality your phone offers, don't crop heavily, and send the original rather than a version that has been through a messaging app — those recompress and discard detail.
Yes, with two cautions. First, buy the largest size offered rather than the web size — stock sites sell the same picture at several resolutions and the cheap one is sized for a screen. Second, check the licence covers the use: some licences restrict physical display, print runs above a certain quantity, or resale items. We can't advise on your licence, but we will tell you if the file is too small for the size you asked for.
CMYK if your software supports it, because that is what the press prints and you will see roughly what you get. If your software is RGB only, send RGB and we convert on a calibrated profile — a controlled conversion beats an uncontrolled one at output time. Screen content such as digital menu boards stays RGB throughout.
PDF is the safest all-rounder: it carries vector artwork, raster images and a defined page size in one file. AI and EPS are fine for vector, TIFF and maximum-quality JPEG for photographs. Outline your fonts or supply them, and flatten transparency if your software warns about it.
Free templates
Bleed, trim and safe margins already drawn — the fastest way to get this right.
Large format printing
What the machine does with the file once it passes preflight.
Window perf
Half your artwork is punched away as holes — design for it.
Upload artwork
Send the file and approve a proof before anything runs.