Recreate one big picture from many small photos. Add a main image and a folder of tile photos; every tile is placed where its colors match best. Tune the number of tiles, reuse limit and color blend, then download a high-resolution PNG or JPG.
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2. Tile photosDrop many photos here
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How to use the Photo Mosaic Maker
Add the main image you want to recreate. A sample sunset and sample tiles are loaded so you can try it first.
Add tile photos: choose many photos or a whole folder. More variety in colors gives a better mosaic; 100+ photos is ideal.
Set tiles across and tile size; the output size is shown below the preview.
Fine-tune with the reuse limit, neighbor repeat avoidance and color blend.
Download the finished mosaic as PNG or JPG and zoom in to see every photo.
Output size and print guide
The download size is tiles across × tile size wide and tiles down × tile size high. Tiles down follows your main image's aspect ratio. For prints, divide the pixel size by the print resolution:
Tiles across × tile size
Width in pixels
Print width at 300 DPI
Print width at 150 DPI
40 × 64 px
2,560
21.7 cm (8.5 in)
43.3 cm (17.1 in)
60 × 80 px
4,800
40.6 cm (16 in)
81.3 cm (32 in)
80 × 100 px
8,000
67.7 cm (26.7 in)
135.5 cm (53.3 in)
100 × 120 px
12,000
101.6 cm (40 in)
203.2 cm (80 in)
Large posters are viewed from a distance, so 150 DPI is usually enough for prints wider than 60 cm.
How the tiles are matched
Every tile photo is center-cropped to a square and measured as four quarters (top-left, top-right, bottom-left, bottom-right), each with an average red, green and blue value. Each cell of the main image is measured the same way. The best tile is the one with the smallest sum of squared differences over those 12 numbers. Matching on quarters instead of a single average lets a tile with a dark bottom and a bright top sit on a horizon, which makes edges in the main image much sharper.
When a reuse limit or neighbor avoidance is on, cells are filled in a shuffled order so that the best tiles are not all used up at the top of the picture.
Tips for a better photo mosaic
Variety beats quantity. Include dark, bright and colorful photos. A collection of only daylight outdoor shots cannot recreate deep shadows.
Choose a simple main image with a clear subject and strong contrast; fine detail is lost at 40-80 tiles across.
More tiles across makes the main image clearer but each photo smaller. 50-80 is a good balance for posters.
Use a little blend (15-30%) if the main image is hard to recognize, especially with few tile photos.
Frequently asked questions
How does a photo mosaic work?
The main image is divided into a grid of cells. For every cell, the tool measures the average color of its four quarters and compares it with the same four values of each tile photo. The tile with the smallest color difference is placed in that cell. From a distance the cells blend into the main picture; up close you see the individual photos.
How many tile photos do I need?
A mosaic works with as few as 20-30 photos, but they will repeat a lot. With 100-500 photos of varied colors and brightness the result is much better. If your tile photos are mostly one color (for example all beach shots), the main image will be hard to reproduce.
What does the reuse limit do?
It sets how many times a single tile photo may be used. A low limit forces more variety but can lower the color accuracy. If there are not enough tiles for the number of cells, the tool tells you and allows extra reuse so every cell is still filled.
What is the color blend?
Blend overlays a semi-transparent copy of the main image on top of the tiles. 15-30% makes the big picture much clearer while the tiles stay visible. 0% shows the tiles completely unchanged, which purists prefer.
How big can the mosaic be?
The output size is tiles across × tile size in pixels. For example 80 tiles of 100 px give an 8,000 px wide image, enough for a 68 cm (27 in) print at 300 DPI. Very large sizes are limited by your browser's memory; the tool caps the width and height at 12,000 px.
Are my photos uploaded?
No. All photos are read and processed locally in your browser. Nothing is sent to a server, so even private photo collections stay on your device.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.