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For AI-generated designs

Make your AI design print-ready.

AI tools are brilliant at ideas — and almost always set up wrong for printing: screen (RGB) color, no bleed or crop marks, and too few pixels for the size. Whether it's a postcard or a 24″ × 36″ poster (or bigger), decide your final size first, pick a tool that can render it at the highest resolution possible, then paste the prompt below into ChatGPT, Nano Banana (Gemini), Midjourney, Firefly, Canva — or any AI tool. We handle the final CMYK conversion and crop marks for you.

01 / THE PROMPT

Paste this into your AI tool

print-ready prompt add-on 
Generate this design to professional print specifications:

• Final size: decide the printed size first, then use a tool/plan that can render it — 24 in wide × 36 in tall.
• Bleed: add 1/8 in (0.125 in) on every side. Extend the background and any edge artwork into the bleed — no white border. Total canvas: 24.25 in × 36.25 in.
• Resolution: generate at the HIGHEST resolution your tool and plan allow — up to 600 DPI (14,550 × 21,750 px) when the tool supports it. More pixels is always better, never a problem. Never go below 3,638 × 5,438 px (~150 DPI), the minimum for this size — big prints are viewed from farther, so ~300 DPI suits something held in hand, ~150 a poster, ~100 a large banner, but always aim higher when the tool allows. If it can't reach the size, make the most it can, then upscale it (see "Going bigger" below) — or we'll enlarge it.
• Safe zone: keep all text, logos and anything important at least 1/4 in (0.25 in) inside the trim edge.
• Color: use bold, high-contrast color. Avoid bright neon greens, blues and oranges — they shift in CMYK. Deep blacks solid, not gray.
• Text: don't bake important words (names, prices, phone numbers) into the image — AI often misspells them. Add that text yourself, or we'll set it cleanly.
• Detail: no hairline-thin lines; no text below ~6 pt.
• File: highest-quality lossless PNG or TIFF — or vector SVG/PDF for flat art. Avoid heavy JPEG compression.

Note: for very large posters or banners, pick a tool built for size — vector (Recraft) scales infinitely, Stable Diffusion tiles to huge pixels, or use a hi-res / upscale mode. AI outputs RGB and can't add crop marks or true CMYK — that's expected; PrintSimply converts to CMYK and adds bleed + crop marks for you.

Your size → the numbers

Enter the final printed size and how close it's viewed. We fill the prompt with the bleed canvas and pixel target.

Canvas with bleed24.25 × 36.25 in
Safe zone (text inside)23.5 × 35.5 in
Minimum (@ 150 DPI)3,638 × 5,438 px
Aim highest → 600 DPI14,550 × 21,750 px

Always output the most pixels your tool allows — more is never a problem.

a worked example — 24 × 36 poster
Photorealistic sci-fi cinematic poster of an astronaut wearing a high-tech white pressure suit riding a beige palomino horse at a gallop across a dramatic red Martian desert landscape, featuring deep orange sand dunes with atmospheric dust clouds kicked up by the galloping hooves against a backdrop of towering red rocky canyons and ancient volcanic mesas under a hazy crimson sky with two cratered moons visible in the upper atmosphere, rendered with warm cinematic sunset color grading, dramatic directional lighting, ultra-sharp focus, and high-fidelity photorealistic detail. Compose it as a tall portrait at a 2:3 aspect ratio with the artwork bleeding fully edge to edge — no borders, frames, or empty margins — and keep the astronaut, the horse, and every key element within the central safe area, well clear of the outer edges (the outer 1/8 inch will be trimmed off). No text, title, lettering, logos, or watermarks. Output the maximum resolution available — 4K (about 4096 px on the long edge) or higher — intended for professional full-bleed wide-format printing at a 24 inch by 36 inch final trim size with an exact 0.125 inch bleed on all four sides (24.25 inch by 36.25 inch total), targeting 300 DPI at final print size.

See how the print specs — full-bleed, the 24 × 36 in trim, the 0.125 in bleed, the resulting 24.25 × 36.25 in document, and 300 DPI — are written right into the prompt. Swap in your own subject and size. After you generate the image, save it as a PDF at 24.25 × 36.25 in (drop it into a page that size in Canva or Word and Export as PDF) — or send us the image and we'll make the print-ready PDF.

The same example, written for each AI tool

New to AI? ChatGPT and Canva below are the easiest — just follow the numbered steps. Whichever tool you use, copy the prompt and send us the result; we'll do the rest.

ChatGPT · easiest
AI Platform Instructions
  1. On a computer or phone, open chatgpt.com (or the ChatGPT app) and sign in — a free account works.
  2. Press the Copy button above to copy the prompt.
  3. Tap the message box at the bottom, paste, and press send.
  4. Wait a moment for your picture to appear.
  5. Save it — on a computer, right-click the picture → Save image; on a phone, press and hold it → Save.
Photorealistic sci-fi cinematic poster of an astronaut in a high-tech white pressure suit riding a beige palomino horse at a gallop across a dramatic red Martian desert with deep orange sand dunes, atmospheric dust clouds kicked up by the hooves, towering red canyons and ancient volcanic mesas, and a hazy crimson sky with two cratered moons, rendered with warm cinematic sunset color grading, dramatic directional lighting, ultra-sharp focus, and high-fidelity photorealistic detail. Make it a tall portrait that fills the entire frame edge to edge with no borders, keep the astronaut and horse centered and clear of the edges, include no text or lettering, and generate it at the largest size available.
ChatGPT's picture is a little small for a giant poster — that's okay. Just send it to us and we'll enlarge it and turn it into a proper print file.
Canva · easiest · makes a print PDF
AI Platform Instructions
  1. Open canva.com and sign in — a free account works.
  2. Click Create a design → Custom size, type 24 in × 36 in, and click Create.
  3. In the top File menu, switch on Show print bleed.
  4. On the left, click Apps → Magic Media. Press Copy above, paste the prompt into the box, and click Generate.
  5. Drag a picture out until it covers the whole page, past the dotted lines.
  6. Click Share → Download, choose PDF Print, tick Crop marks and bleed, and download.
Photorealistic sci-fi cinematic poster of an astronaut in a high-tech white pressure suit riding a beige palomino horse at a gallop across a dramatic red Martian desert with deep orange sand dunes, dust clouds kicked up by the hooves, towering red canyons and volcanic mesas, and a hazy crimson sky with two cratered moons, warm cinematic sunset color grading, dramatic lighting, ultra-sharp photorealistic detail, full-bleed poster, no text.
That PDF is print-ready — send it straight to us. Want a headline on it? Add it with Canva's own Text tool, never inside the AI picture.
Nano Banana · Google Gemini · the highest quality
AI Platform Instructions
  1. On a computer, open aistudio.google.com and sign in with a Google account (free).
  2. At the top, choose the model Nano Banana Pro (or Nano Banana 2).
  3. Set the shape to 2:3 (tall) and the size to 4K (the biggest).
  4. Press Copy above, paste the prompt in the box, and click Run.
  5. When the picture appears, click it and download it.
Photorealistic sci-fi cinematic poster of an astronaut in a high-tech white pressure suit riding a beige palomino horse at a gallop across a dramatic red Martian desert with deep orange sand dunes, atmospheric dust clouds kicked up by the hooves, towering red canyons and ancient volcanic mesas, and a hazy crimson sky with two cratered moons, rendered with warm cinematic sunset color grading, dramatic directional lighting, ultra-sharp focus, and high-fidelity photorealistic detail. Compose it as a tall portrait that bleeds fully edge to edge with no borders or margins, keep the astronaut and horse within the central safe area well clear of the outer edges, and include no text, logos, or watermarks.
The 4K picture is big enough for a 24 × 36 inch poster. Send it to us and we'll make the print-ready file.
Ideogram
AI Platform Instructions
  1. Open ideogram.ai and sign in (free).
  2. Set the shape to 2:3 (tall) and pick the highest quality.
  3. Press Copy above, paste the prompt, and click Generate.
  4. When the picture appears, click Upscale to make it bigger, then download it.
Photorealistic sci-fi cinematic poster of an astronaut in a high-tech white pressure suit riding a beige palomino horse at a gallop across a dramatic red Martian desert with deep orange sand dunes, atmospheric dust clouds kicked up by the hooves, towering red canyons and ancient volcanic mesas, and a hazy crimson sky with two cratered moons, warm cinematic sunset color grading, dramatic directional lighting, ultra-sharp focus, high-fidelity photorealistic detail, tall full-bleed portrait with the subject centred and clear of the edges, no text
Send us the picture and we'll turn it into a print-ready PDF and handle the rest.
Recraft · makes a print PDF
AI Platform Instructions
  1. Open recraft.ai and sign in (free).
  2. Choose the Raster style for a photo look (or Vector for flat, cartoon-style art).
  3. Set the canvas shape to 2:3 (tall).
  4. Press Copy above, paste the prompt, and click Generate.
  5. Click Download and choose PDF.
Photorealistic sci-fi cinematic poster of an astronaut in a high-tech white pressure suit riding a beige palomino horse at a gallop across a dramatic red Martian desert with deep orange sand dunes, dust clouds kicked up by the hooves, towering red canyons and volcanic mesas, and a hazy crimson sky with two cratered moons, warm cinematic sunset color grading, dramatic lighting, ultra-sharp photorealistic detail, full-bleed poster, no text.
Recraft can save a PDF directly, which is great for print — just send it over. Vector art can be blown up to any size with no blurriness.
Midjourney · more advanced
AI Platform Instructions
  1. This one is for people already using Midjourney. If it feels tricky, use ChatGPT or Canva above instead.
  2. Press Copy above and paste the whole prompt (the --ar 2:3 at the end sets the tall poster shape).
  3. Send it, then click Upscale on the picture you like.
  4. Save the upscaled picture.
Photorealistic sci-fi cinematic poster of an astronaut in a high-tech white pressure suit riding a beige palomino horse at a gallop across a dramatic red Martian desert with deep orange sand dunes, atmospheric dust clouds kicked up by the hooves, towering red canyons and ancient volcanic mesas, and a hazy crimson sky with two cratered moons, warm cinematic sunset color grading, dramatic directional lighting, ultra-sharp focus, high-fidelity photorealistic detail, tall full-bleed portrait poster with the subject centred and clear of the edges, no text --ar 2:3 --style raw --quality 2
Send us the upscaled picture and we'll make the print-ready PDF and handle the rest.
Stable Diffusion · advanced
AI Platform Instructions
  1. This is a tool for advanced users. If that's not you, use ChatGPT or Canva above.
  2. Set the picture shape to 2:3 at the biggest size your computer allows (for example 1024 × 1536).
  3. Press Copy above and paste the prompt.
  4. Run an "upscaler" (such as Ultimate SD Upscale) to enlarge it, then save.
Photorealistic sci-fi cinematic poster of an astronaut in a high-tech white pressure suit riding a beige palomino horse at a gallop across a dramatic red Martian desert with deep orange sand dunes, atmospheric dust clouds kicked up by the hooves, towering red canyons and ancient volcanic mesas, and a hazy crimson sky with two cratered moons, warm cinematic sunset color grading, dramatic directional lighting, ultra-sharp focus, high-fidelity photorealistic detail, tall full-bleed portrait with the subject centred away from the edges, no text
Send us the final picture and we'll make the print-ready PDF and handle the color and crop marks.
Adobe Firefly · advanced · makes a print PDF
AI Platform Instructions
  1. This one lives inside Photoshop, for people who already have it. Otherwise use Canva above — it's easier and also makes a print PDF.
  2. Make a New document: 24.25 × 36.25 inches, 300 DPI, CMYK Color.
  3. Select the whole canvas, press Copy above, and run Generative Fill with the prompt.
  4. Pick the version you like, then File → Save As → Photoshop PDF using the PDF/X-4 preset with bleed and marks turned on.
Photorealistic sci-fi cinematic poster of an astronaut in a high-tech white pressure suit riding a beige palomino horse at a gallop across a dramatic red Martian desert with deep orange sand dunes, dust clouds kicked up by the hooves, towering red canyons and volcanic mesas, and a hazy crimson sky with two cratered moons, warm cinematic sunset color grading, dramatic lighting, ultra-sharp photorealistic detail, full-bleed poster filling the frame, no text.
That's a finished, print-ready file — send it straight to us.
02 / YOUR TOOL

Tailored for each AI tool

Use the prompt above, then add these tool-specific settings. First pick a tool that can reach your final size — many image generators top out around 1–2K pixels (plenty for a card), though Nano Banana Pro/2 (up to 4K), Stable Diffusion, and Recraft (vector) can go large; for a 24 × 36 poster or bigger, lean on those, or upscale a smaller render. Two kinds of tools: a few export a real print PDF; most give a great RGB source image and we finish the prepress.

Can export a print-ready PDF (bleed + crop marks) RGB source image — PrintSimply finishes CMYK + marks
Design app · exports print PDF

Adobe Firefly in Photoshop / Illustrator

The closest to a finished file — Firefly lives inside Adobe's print apps, so you control size, DPI and CMYK.

Set up: new document at your trim + 0.125″ bleed, 300 DPI, CMYK Color. Use Generative Fill to make and extend art into the bleed. Save As → PDF (PDF/X-4) with bleed + trim marks — send it and we preflight.
Design app · exports print PDF

Canva Magic Media

Simple layouts with bleed built in. The AI image is RGB, but Canva's print export adds the bleed and crop marks.

Set up: Custom-size design at your trim size → turn on Show print bleed → drop your AI image and pull it to the bleed guides → Download → PDF Print, tick Crop marks and bleed.
RGB image · up to ~1536 px

ChatGPT GPT-4o / DALL·E

Great for backgrounds and imagery; weak at precise text. You can't set exact pixels, DPI or CMYK.

Pick the shape: portrait 1024×1536 or landscape 1536×1024, whichever is closest to your trim. Ask for a full-bleed image, no border, key elements centered. Its ~1536 px is small for a poster — generate it, then upscale (or send it and we enlarge).
RGB image · up to 4K · edits too

Nano Banana Google Gemini image

Gemini's image model — generates and edits, superb at refining an image and holding a subject consistent. The newer Nano Banana Pro (Gemini 3 Pro Image) and Nano Banana 2 (Gemini 3.1 Flash Image) output up to 4K (~4096 px) — big enough for a poster.

Where: Google AI Studio (free) or the Gemini API / Vertex AI. Resolution: set the output size to 2K or 4K (the size field — uppercase K). ⚠ the consumer Gemini app may cap downloads lower, so use AI Studio for full 4K. Prompt: the aspect ratio closest to your trim + bleed, full-bleed to the edges. (The older gemini-2.5-flash-image is ~1K — use a Pro / 2 model at 4K for large prints.)
RGB image · best resolution

Midjourney

The highest-quality generated art of the image tools — still RGB, no crop marks.

Flags: add --ar W:H to match your trim + bleed shape (a 4×6 ≈ --ar 2:3) and --style raw. Generate, then Upscale for the most pixels.
RGB image · exact pixel size

Stable Diffusion ComfyUI · Leonardo

The one image path where you set exact pixels — so you can hit 300 DPI natively.

Set width × height to inches × 300 including bleed (a 4×6 → 1275×1875). Use tiled upscaling for large sizes. RGB out; we convert.
RGB image · best at text

Ideogram

The strongest at rendering readable words inside the image — handy when your design has a headline or logo text baked in.

Pick the aspect ratio for your trim + bleed, generate at the highest quality, then Upscale. RGB out — we convert and add marks.
Vector · exports SVG / PDF

Recraft

Can generate vector art (SVG) that scales to any print size with no resolution limit — ideal for logos, icons and flat graphics.

Choose “Vector”, set your size / aspect, generate, then export SVG or PDF. Resolution is never a worry with vector; we still convert the color to CMYK.

Using Grok, Flux, Bing / Copilot or another generator? Treat it like the image tools above — match the aspect ratio, generate the largest size available, and send us the source. We'll finish the prepress.

03 / THE SPECS

What each setting means

Five things separate a screen graphic from a print file. Prompt for these and your AI art arrives clean.

Resolution

Always the highest you can

Generate the most pixels your tool allows — up to 600 DPI. The viewing-distance minimum (~300 in hand, ~150 poster, ~100 banner) is the floor, never the target. More pixels is always better; it never hurts.

24 × 36 in → floor 3,638 px · max 14,550 px wide
Size & bleed

Add 1/8″ all around

Printers cut through a stack of sheets, so color must run past the cut. Extend the background 0.125″ beyond every edge — a “bleed” — with no white border, or you risk a thin white sliver at the trim.

Trim 24 × 36 → build 24.25 × 36.25 in
Safe zone

Keep text 1/4″ in

Cutting has a small tolerance. Hold text, logos and faces at least 0.25″ inside the trim so nothing important lands on the blade.

24 × 36 in → keep inside 23.5 × 35.5 in
Color

RGB looks brighter than it prints

Screens glow in RGB; presses lay down CMYK ink. Bright neon greens, blues and oranges are the ones that shift most. Pick rich, saturated-but-real color and expect a small settle on press.

Deep blacks print richest as a rich black (we build it C30 M60 Y30 K100). Small text stays 100% K so it prints sharp — you don't set this, just know it.

File format

Lossless, not compressed

Export PNG or TIFF. Heavy JPEG compression bakes in blocky halos around edges and text that can't be removed later. If the tool offers a PDF, high-quality PDF is welcome too.

Detail

No hairlines, no tiny type

Lines thinner than a hair and text under ~6 pt can drop out or fill in on press. Keep strokes visible and type readable at arm's length.

Going bigger

Big natively, or upscale

Prefer a model that renders large natively — Nano Banana Pro / 2 at 4K (in Google AI Studio) or Stable Diffusion. For smaller tools, generate the largest they allow, then enlarge with an upscaler: a built-in “Upscale”, Topaz Gigapixel AI (paid), Upscayl (free) or Magnific AI. Or send us the biggest file and we'll upscale it.

AI text

Keep words out of the image

AI tools are notoriously bad at spelling text inside a picture. Keep important wording — names, prices, phone numbers — out of the AI image; add it in a layout tool, or send it to us as text and we'll set it cleanly.

04 / ANATOMY

Bleed, trim & safe zone

YOUR TEXT HERE BLEED 0.125″ TRIM SAFE 0.25″
Bleed — the outer 1/8″Color extends past the cut. Gets trimmed off; guarantees no white edge.
Trim — the finished sizeWhere the blade cuts. Your product's actual dimensions.
Safe zone — 1/4″ insideEverything you can't afford to lose stays inside this line.

The honest part

Some things AI simply can't do — and we finish for free

No prompt makes a generative AI output true CMYK, printer crop marks, or spot colors. That's normal. Get the source art high-quality with the prompt above, and our prepress team does the rest.

You / your AI get the source right

  • Correct size + 1/8″ bleed on the canvas
  • 300 DPI / enough pixels, rendered large
  • Text & logos inside the safe zone
  • Bold color, solid blacks, no tiny detail
  • Lossless PNG or TIFF export

PrintSimply finishes the prepress

  • Convert RGB → CMYK and check the color
  • Add crop marks & confirm the bleed
  • Set rich black & keep small text 100% K
  • Flatten, preflight & build the print PDF
  • Send you a proof before anything runs
05 / PRE-FLIGHT

Before you send it to us

It's the right size, plus bleedBuilt at your trim size + 0.125″ on every side, background running to the edge.
It's big enough for the sizeAt least inches × your DPI (≈300 in hand, ≈150 for a poster). More is always fine.
Nothing important near the edgeText, logos and faces sit at least 1/4″ inside the trim.
Saved losslessPNG, TIFF, or a high-quality PDF — not a small, heavily compressed JPEG.
Colors you can live with a touch softerAnything neon-bright on screen will settle a little in CMYK. We proof it first.
06 / FAQ

Common questions

Can an AI tool make a fully print-ready file?
We prefer a print-ready PDF designed by a seasoned professional graphic artist in Adobe Illustrator — that's the surest path to a flawless print. If that's not an option, yes, we'll do our best to print from an AI-generated PDF too. On its own an AI tool can't quite get there — generative tools output RGB screen images and can't add crop marks or true CMYK — but with the prompt on this page you get a high-resolution, correctly-sized source with bleed, which is 90% of the way there, and PrintSimply handles the CMYK conversion and crop marks.
Which AI tool is best for print-ready files?
For a near-final file, use Adobe Firefly inside Photoshop or Illustrator or Canva — both set the size, add bleed, and export a print PDF with crop marks. Recraft can make vector art that scales to any size. For pure image quality, Midjourney and Stable Diffusion lead (Stable Diffusion lets you set exact pixels); Nano Banana (Gemini) is best for editing an existing image, and Ideogram for readable text. ChatGPT is quick for imagery but outputs a fixed-size RGB image. Whichever you use, send us the source and we finish the CMYK conversion and crop marks.
What DPI (resolution) do I need for printing?
Those are minimums by viewing distance: held in hand ~300 DPI, a poster ~150, a big banner ~100. But always ask the tool for the highest resolution it can produce — up to 600 DPI if it's capable; more pixels never hurts. Multiply each inch by the DPI for the count — a 24 × 36 poster is ~3,638 × 5,438 px at 150, or up to ~14,550 × 21,750 px at 600.
What resolution do I need for a 24 × 36 poster?
Big prints are viewed from farther away, so they need fewer dots per inch than a card. A poster is fine at about 150 DPI — a 24 × 36 in poster works out to roughly 3,638 × 5,438 px including bleed. If your AI tool can't render that big, make the largest it can and we'll enlarge it — or use vector art (Recraft), which scales to any size with no resolution limit. More pixels is always welcome.
How do I make an AI image big enough for a large poster?
Two ways. First, use a model that renders large natively — Nano Banana Pro or Nano Banana 2 (Google's Gemini image models) output up to 4K (~4096 px) in Google AI Studio, and Stable Diffusion lets you set exact pixels. Otherwise, generate the largest a tool allows and enlarge it with an upscaler — a built-in “Upscale”, Topaz Gigapixel AI (paid), Upscayl (free) or Magnific AI. Or just send us the largest file you have and we'll upscale it for you.
Why is the text in my AI image misspelled?
AI image tools are notoriously bad at spelling words inside a picture. Keep important text — names, prices, phone numbers — out of the AI image and add it in a layout tool, or send us the wording as text and we'll set it cleanly and correctly.
Why do my colors look different once printed?
Screens emit light in RGB and can show colors that ink can't reproduce. Printing uses CMYK ink, so the brightest neon greens, blues and oranges settle a little. Choose rich, realistic color and we'll proof the converted file before anything runs.
What is “bleed,” and how much do I need?
Bleed is artwork that extends past the cut line so no white edge shows if the blade drifts slightly. The standard is 1/8 inch (0.125″) on all four sides. Build your file at the trim size plus that margin all around.
Do I have to convert to CMYK or add crop marks myself?
No. Send the highest-quality RGB file you can make with the prompt above. We convert to CMYK, set rich black, add crop marks and bleed, preflight the file, and send you a proof.
What file type should I send?
A high-resolution PNG or TIFF is ideal; a high-quality PDF works well; and vector SVG or PDF is best of all, since it scales to any size. Avoid a small, heavily compressed JPEG. We build the final print file from whatever you send.
My AI image has a transparent background — is that a problem?
No. Tell us the background color you'd like behind it (or leave it and we'll confirm on the proof). For print we flatten transparency onto a solid background, so nothing shows through unexpectedly.
How large can you print?
From business cards up to large-format posters and banners — 24 × 36 in and well beyond. Tell us the final size and we'll confirm the file has enough resolution for it (big prints viewed from a distance need fewer DPI), then enlarge or advise if needed.
Can you match exact brand or Pantone colors?
AI tools output RGB and can't set spot or Pantone colors. We convert to CMYK and match your brand colors as closely as full-color printing allows; if you need an exact Pantone, tell us and we'll advise on a spot-color option.