How to Make a Print-Ready Poster from HTML
Short answer
Render your HTML at the poster's real size and the right resolution, then export a high-resolution PDF or image. Posters need 150 to 300 DPI depending on how close people stand: 300 for pieces read up close, 150 for large posters viewed from a few feet away. A 24 by 36 inch poster at 150 DPI is 3600 by 5400 pixels. Screenshots never work at poster size.
Posters are where resolution really starts to matter, because you are printing across a lot of area. The good news is that a poster is just a big HTML page, so the same paste-and-export workflow applies. The trick is understanding how DPI and viewing distance interact at large sizes, so you render enough detail without creating a file that is needlessly enormous.
Standard poster sizes
Pick your size first. These are the common ones, with the pixel dimensions at two useful resolutions.
| Poster | Inches | 150 DPI | 300 DPI |
|---|---|---|---|
| Tabloid | 11 × 17 | 1650 × 2550 | 3300 × 5100 |
| A2 | 16.5 × 23.4 | 2480 × 3508 | 4960 × 7016 |
| 18 × 24 | 18 × 24 | 2700 × 3600 | 5400 × 7200 |
| A1 | 23.4 × 33.1 | 3508 × 4961 | 7016 × 9933 |
| 24 × 36 | 24 × 36 | 3600 × 5400 | 7200 × 10800 |
How much DPI does a poster actually need?
Here is the part that saves you a lot of file size. DPI requirements drop as viewing distance grows, because your eye cannot resolve fine detail from across a room. A flyer in your hand needs 300 DPI. A poster on a wall that people read from three or four feet away looks perfectly sharp at 150 DPI. A billboard read from across a street can be far lower.
So the rule for posters is: use 300 DPI for pieces people will study up close, like a detailed event poster or an art print, and 150 DPI for large posters that will be viewed from a distance. Choosing 150 where it is appropriate can cut your file size to a quarter of the 300 DPI version with no visible loss.
The pixel math, made simple
The formula is just inches times DPI. A 24 by 36 inch poster at 150 DPI is 3600 by 5400 pixels (24 times 150, and 36 times 150). At 300 DPI it is 7200 by 10800. Those are big numbers, and that is exactly the point: a poster needs a lot of pixels, which is why a screenshot, capped at screen resolution, always falls apart at poster size.
MarkUpTo is a free browser tool built for this exact step. Paste your HTML, pick your page size, choose 300 or 600 DPI, and export a print-ready PDF or image. It shows the output pixel size before you export, needs no account, and runs in your browser so nothing gets uploaded.
Rendering the poster
Because a poster is a large HTML page, you render it the same way you would any design, just at the larger dimensions and your chosen DPI. Set a custom page size to your poster size, choose 150 or 300 DPI based on viewing distance, and export a high-resolution image or PDF. Design tip: because posters are viewed from a distance, make your headline much larger than feels natural on screen. Type that looks big on your monitor can be surprisingly small on a wall.
Sending a poster to a print shop
Large-format printing almost always goes through a print shop or online service, since few home printers handle poster sizes. Most accept a high-resolution PDF or a PNG. A few practical notes:
- Match the size exactly. Tell the printer the finished size and make sure your file is that size at your chosen DPI.
- Ask about bleed. If your design runs to the edge, the printer may want a small bleed margin so nothing white shows after trimming.
- Check the file size limit. A 300 DPI 24 by 36 poster is a large file. If it is too big to upload, a 150 DPI version is usually more than enough for a wall poster.
- Consider color. Presses print in CMYK, so very saturated colors can shift slightly. Ask for a proof if color accuracy is critical.
Step by step: HTML to printed poster
- Choose the poster size and how far away people will view it.
- Design or generate the HTML, with an oversized headline for distance reading.
- Render it at the poster size, at 300 DPI for close viewing or 150 DPI for distance.
- Export a high-resolution PDF or PNG.
- Upload to a large-format print service, with bleed if needed.
Match the size, pick the right DPI for the viewing distance, and an HTML design scales up to a poster that looks sharp on the wall without producing a file bigger than it needs to be.
Design tips for large format
Posters are viewed differently from anything you hold, and designing for that distance is what separates a poster that reads from one that gets ignored.
- Oversize the headline. Type that feels large on your monitor can be small on a wall. Make the main message far bigger than seems necessary, so it reads from across a room.
- High contrast. A poster competes with a busy environment. Strong contrast between text and background keeps it legible from a distance and under imperfect lighting.
- Keep it simple. A poster is not a brochure. One strong image, a clear headline, and the essential details will outperform a dense wall of text every time.
- Mind the safe area. Keep important text away from the very edges, so nothing critical sits where it might be trimmed or hidden by a frame.
Materials and mounting
The paper and finish change how a poster feels as much as the design does. A matte finish reduces glare and is easy to read under bright light, which suits text-heavy or informational posters. A gloss or satin finish makes colors and photos pop, which suits art prints and event posters. Heavier paper stock resists curling and feels more permanent, worth it for anything that will hang for a while.
If the poster will be mounted or framed, tell the print shop, because they may leave a border or add a backing. And if you plan to laminate it or display it outdoors, ask about weatherproof materials, since standard poster paper is not made for moisture. None of this changes how you export the file: you still send a high-resolution PDF or image at the right size. It just determines what the shop prints it on.
Proof a poster before the full print
Large-format printing is not cheap, so proof before you commit. There are two easy ways. Print the poster scaled down onto a normal sheet of paper, which lets you check the layout, the spelling, and the overall balance in your hand. Or view the full-size file at 100 percent on your screen and scroll around, which shows you the true sharpness of the type and images at final size. Both catch problems, a typo, a low-resolution photo, an awkward margin, while they are still free to fix.
Ordering and turnaround
When you send a poster to a print service, a little planning avoids surprises. Confirm the finished size and the material before you order, ask whether they need bleed, and check the turnaround time, since large-format jobs can take longer than standard prints, especially with mounting or lamination. If the poster is for a dated event, build in a buffer so a reprint is possible if something is wrong. And keep your source HTML, because posters often get reused with small changes, a new date or venue, and starting from the original file is far quicker than rebuilding.
Frequently asked questions
What DPI does a poster need?
150 to 300 DPI, depending on viewing distance. A poster read up close, like an A2 event poster, wants 300 DPI. A large poster viewed from several feet away can look sharp at 150 DPI, because the eye cannot resolve the extra detail at distance.
What are standard poster sizes?
Common sizes are A2 (16.5 by 23.4 inches), A1 (23.4 by 33.1 inches), 18 by 24 inches, and 24 by 36 inches. Tabloid, 11 by 17 inches, is a common small poster that many home-adjacent printers can handle.
How many pixels do I need for a 24 by 36 poster?
At 150 DPI, a 24 by 36 inch poster is 3600 by 5400 pixels. At 300 DPI it is 7200 by 10800 pixels. Large posters end up with very high pixel counts, which is why a screenshot never works for them.
Can I print a poster from an HTML page?
Yes. Render the HTML at your poster size and DPI, export it as a high-resolution PDF or image, and send that to a large-format printer. The key is rendering enough pixels for the finished size.