ImageSmith / poster generator
AI poster generator
Describe the event or offer and the look you want. You get a portrait poster with the headline worked into the design, ready for print or social media.
Your image appears here.
Sizes you'll need
| Placement | Size | Note |
|---|---|---|
| A4 / US Letter print | 2480 × 3508 px (A4 at 300 ppi) | Generate portrait, then upscale 2–3× for print |
| A3 / Tabloid | 3508 × 4961 px | Upscale 4× and view at arm's length |
| Instagram portrait | 1080 × 1350 px | 4:5 crop of a portrait poster |
| Story / Reel | 1080 × 1920 px | Keep text out of the top and bottom 250 px |
From each platform's published guidelines; they change occasionally. The image resizer crops to any of them.
What works
- Keep the headline to 2–5 words in quotes; put dates and small print in afterwards with an editor.
- Name one dominant image and a limited palette; posters work from across a room.
- Ask for "empty space at the bottom" if you will add a logo or address later.
- For print, generate the portrait shape, upscale with the image upscaler, and export at 300 ppi.
Questions people ask
Can the AI poster generator add my exact text?
Short headlines in quotes come out correctly most of the time with current models. Long paragraphs, addresses and prices are safer to add afterwards in Canva, Word or any editor, where you can also fix the fonts.
Is the resolution good enough to print?
Portrait outputs are 1024 × 1536 pixels. That prints sharp at about 3.4 × 5 inches at 300 ppi. For A4 or Letter, upscale 2–3× with the free image upscaler; posters are viewed from a distance, so this works well.
Can I use the poster commercially?
Yes. You own the output under OpenAI's terms. Don't include other brands' logos, celebrities or copyrighted characters.