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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.

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 — the image generators top out around 1–2K pixels (plenty for a card); for a 24 × 36 poster or bigger, lean on vector (Recraft), Stable Diffusion's tiling, or a hi-res / upscale mode. 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 · ~1024 px · edits too

Nano Banana Google Gemini 2.5 Flash Image

Gemini's image model — it generates and edits. Superb at refining an existing image and holding a subject consistent across edits. RGB, ~1024 px.

Where: the Gemini app, Google AI Studio (free), or the API model gemini-2.5-flash-image. Prompt: ask for the aspect ratio closest to your trim + bleed and full-bleed art to the edges; then use its edit step to extend the background into the bleed. Its ~1024 px is small for a poster — upscale afterward, or we enlarge it.
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

Upscale for large format

AI images top out around 1–2K pixels — small for a poster. Generate the largest the tool allows, then enlarge with an upscaler: a built-in “Upscale”, Topaz Gigapixel AI (best, paid), Upscayl (free, open-source) 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?
Not by itself — 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. 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?
AI tools make fairly small images (about 1,000–2,000 px). Generate the largest the tool allows, then enlarge it with an upscaler — a built-in “Upscale” button, or Topaz Gigapixel AI (best quality, paid), Upscayl (free and open-source) 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.