How to Make a Photo Mosaic: A Step-by-Step Guide

You can make a photo mosaic yourself, and you don't need to spend anything to try. What makes the difference between one that looks good on a phone and one that holds up on a wall is mostly in the choices you make along the way. Here's how to do it, step by step.

What You Need

• A main photo. The picture you'll see from a distance.
• Tile photos. The small photos that build it. 100 is enough to start, 300 or more is better, and more still helps. (See How Many Photos Do You Need?)
• A mosaic tool. A free online maker, a phone app, desktop software, or an image editor if you want to do it by hand.

1. Choose the Main Photo

Not every photo makes a good main photo. The ones that work best have:

• Clear light and dark areas. Contrast is what lets the picture read from across a room.
• One clear subject. A face or a pet against a calm background beats a busy group scene.
• A face that fills a good part of the frame, if there is one. Small faces lose their features once they're built from tiles.

Photos to avoid: very dark ones, very busy ones, and flat, low-contrast ones where the subject blends into the background.

2. Gather Your Tile Photos

• Go for variety. Different places, light and seasons give the tool more colors to work with.
• Drop near-duplicates. Ten frames from one burst add count, not variety.
• Mind the edges. Most tools crop every photo to the same shape, so anything right at the edge of a photo can get cut off.

3. Pick a Tool

There are four common routes. Each suits a different job.

• Free online makers. Upload your photos, get a mosaic in minutes. Great for trying the idea or sharing on a screen. Check how large the download is before you plan a print. We run one ourselves: Photomosaic Maker is free, needs no sign-up and works on a phone.
• Phone apps. Handy when your photos are already on your phone. Many are built for social posts and screens, so check the export size here too.
• Desktop software. More control over tile size, repetition and color, and usually larger exports. Worth it if you want to experiment.
• By hand in an image editor. Possible, and a nice project if you enjoy it, but slow. Placing hundreds of photos one by one takes hours.

4. Choose the Settings

Most tools give you a few of these. Each one is a trade-off.

• Tile size. Smaller tiles make the main photo sharper from a distance. Larger tiles make each photo easier to see up close. You can't max out both.
• Repetition. If the tool lets you limit how often a photo repeats, use it. Fewer repeats look better, but need more photos.
• Overlay or blend. Many tools can lay a faded copy of the main photo over the tiles. It makes the big picture clearer, but it tints every photo. If you have enough varied photos, keep it low or off.

5. Check It Before You Print

This is the step people skip. Open the finished file at full size and look closely:

• Tint. Do the tile photos keep their own colors, or do they all share one wash?
• Faces. Are the people in the tile photos whole, or cut off at the forehead?
• Repeats. Can you spot the same photo over and over in one area?
• Sharpness. Can you still tell what's in each tile, or do they blur into blocks?

Here's what it should look like. This is one of ours: zoom in and every tile is a photo in its own colors.

6. Print It

For a print you'll look at up close, the file needs plenty of pixels. A common rule of thumb is at least 150 pixels per inch of print. For a 24×36″ poster, that's at least 3,600 × 5,400 pixels, and a mosaic benefits from more, because every tile has to stay readable.

• Paper poster. The simplest option. Any good print shop or online printer can do it.
• Canvas. No glass, no glare, ready to hang.
• Framed. The most finished look, and it protects the print.

If you can, print a small section at full size first. It's a cheap way to check sharpness before you order the big one.

When It's Worth Having It Made

We make mosaics for a living, so we're not neutral here. Doing it yourself is a good choice when you want to try the idea, share it on a screen, or enjoy the process. Having it made is worth it when:

• You want a large print that stays sharp up close.
• You'd rather not sort hundreds of photos and tune settings.
• It's a gift, and you want to see a preview and ask for changes before anything is printed.

If that's you, our mosaics come as a poster, framed poster, canvas or digital file.

FAQ

Can I make a photo mosaic for free?

Yes. Free online makers and some apps will make one from your photos. Our own Photomosaic Maker is free with no sign-up: pick a main photo and 100 to 1,000 others, and it's ready in about a minute. Check the download size if you plan to print it.

What's the best app for making a photo mosaic?

It depends on what you'll do with it. For a quick mosaic to share, a phone app or free online maker is fine. For a print, pick a tool that exports a large file and lets you turn the overlay down.

Can I make a photo mosaic in Photoshop?

Yes, by hand. You arrange the tile photos into a grid and blend the main photo over them. It works, but it takes a long time and the blend tints every photo.

How long does it take?

With a tool, minutes to make and longer to get right. By hand, hours. Having one made takes a few days: we send a preview within 3 business days of receiving your photos.

What resolution do I need to print?

At least 150 pixels per inch of print as a rule of thumb, and more for a mosaic. Our files are up to 12,800 × 9,600 pixels.

Want to see yours without doing the sorting? Start with your main photo, and we'll send a preview before anything is printed.