Poster Guides

Practical tutorials for planning, making and printing big posters at home.

These poster guides show you how to turn your own photos into large wall posters with nothing more than a home printer, a stack of ordinary paper and a free browser tool. Each guide focuses on one stage of the job, so you can read only what you need or work through all of them before your first print.

Every guide is written from hands-on testing: real photos, real printers and real trimming mistakes. You will find concrete numbers rather than vague advice — how many pixels a photo needs for a given size, which print setting keeps the sheets aligned, how far apart halftone dots should be for your room, and which paper hides the seams best.

Browse the poster guides

Three in-depth tutorials, each with a step-by-step walkthrough, a troubleshooting list and answers to common questions.

Start here: which poster guide should you read?

Pick the situation that sounds most like yours. If you are unsure, read them in the order listed — they follow the same path as a real project, from choosing a photo to hanging the finished poster.

You have a photo and want it on the wall as big as possible, but you have never printed a poster across several sheets before. This guide covers the whole process from start to finish.
How to Make a Poster From a Photo
Your photo is small, old or a little soft, or you simply want a bold graphic look. A halftone effect turns the picture into dots that stay crisp at any size.
How to Make a Giant Halftone Poster at Home
You already have the pages but the sheets do not line up, show white stripes between them or print in slightly different colours. Start with the printing checklist.
Poster Printing Tips: Get a Clean Multi-Sheet Poster at Home

What each poster guide covers

How to Make a Poster From a Photo

The core tutorial. It explains how to judge whether a photo is sharp enough, how photo resolution translates into DPI on paper, and how the number of pages across sets the final poster size. You will see finished dimensions for common grids, such as about 57 × 83 cm for 3 × 3 portrait A4 sheets.

It then walks through preparing the pages in your browser, printing at the correct scale, trimming, joining the sheets and hanging the result, and ends with the mistakes that most often spoil a first attempt.

How to Make a Giant Halftone Poster at Home

A guide to dot art. It covers where the halftone technique comes from, why it suits giant posters, and a simple rule for choosing dot spacing: allow roughly half a metre of viewing distance for every millimetre between dots.

You will also learn how circle, square and diamond dots change the character of the image, when to choose black and white over colour, and how the dot grid stays continuous across sheet edges.

Poster Printing Tips: Get a Clean Multi-Sheet Poster at Home

A printing checklist for anyone producing a poster on several sheets. It covers the print dialog settings that keep pages at their true size, paper weight and finish, keeping colour consistent across a long print run, and clean trimming.

It also compares overlapping seams with edge-to-edge joins, explains how to mount the finished poster and includes a symptom-by-symptom troubleshooting list.

Quick reference: key poster printing facts

The numbers that come up again and again across the guides, collected in one place. Keep this table open while you set up your first print.

Quick reference: key poster printing facts
What	Value
Print scale	100% or “Actual size” — never “Fit to page”
A4 paper	210 × 297 mm (8.3 × 11.7 in)
US Letter paper	8.5 × 11 in (216 × 279 mm)
A3 paper	297 × 420 mm (11.7 × 16.5 in)
White margin on each sheet	10 mm, trimmed off before assembly
Printable image area on A4	190 × 277 mm
Overlap strip (optional)	5 mm on the right and bottom edges
Sharp when seen up close	About 150 DPI or more
Fine for wall viewing	About 100 DPI
Paper for a keeper	100–120 g/m² matte
Halftone dot spacing	2–20 mm; about 0.5 m of viewing distance per mm

DPI here means the effective resolution of your photo on paper: its width in pixels divided by the poster width in inches. A 3,000-pixel-wide photo printed 20 inches wide gives 150 DPI.
The 10 mm margin exists because most home printers cannot print right to the edge of the sheet. Margin and trim marks together let every page print fully and still join seamlessly.
Print one test sheet and measure it with a ruler before printing the rest. If the image is smaller than expected, the print dialog is scaling the page.

How to get the most out of these guides

A big poster rewards a little planning. Before you print anything, decide where the poster will hang and how far away people will usually stand. That single distance tells you how sharp the photo needs to be, whether a halftone effect is worth trying and how many sheets you can reasonably use.

Next, prepare the pages and look at the live preview carefully. The sheet grid shows exactly where each page falls, so you can check that faces and important details do not sit right on a seam. Moving to landscape sheets or changing the number of pages across often fixes an awkward split.

Start small: a 2 × 2 grid of A4 sheets (about 38 × 55 cm) is a quick, low-cost first project.
Use the original photo file rather than a copy sent through a chat app, which is usually compressed.
Print every page in one session, from one file, with the same settings and paper.
Trim with a craft knife and a metal ruler; scissors drift and leave wavy edges.
Lay the sheets out by their row and column labels before you glue anything down.

Poster guides FAQ

Do I need special equipment to follow these poster guides?

No. Every guide assumes an ordinary inkjet or laser printer that takes A4, US Letter or A3 paper, plus a craft knife, a ruler and tape or a glue stick. No wide-format printing is needed.

How big can a poster printed at home be?

The tool supports up to 20 pages across, so the practical limit is your photo's resolution and your wall space. A 4 × 4 grid of A4 sheets already gives about 76 × 111 cm.

Which print setting matters most?

Scale. Print at 100% or “Actual size”, and switch off “Fit to page” and borderless printing. Any scaling makes every sheet slightly smaller, and the pages stop lining up.

My photo is low resolution. Can I still make a poster?

Often, yes. Use fewer pages across so each inch of paper gets more pixels, or switch to a halftone effect, which redraws the image as sharp dots and hides softness well.

Is the poster tool free, and is my photo uploaded?

It is free and needs no sign-up. Your photo is processed entirely in your browser and never leaves your device, so private pictures stay private.

Will more poster guides be added?

Yes. The library grows as new tools and techniques are added, and existing guides are updated when settings or recommendations change.