There are a number of apps and programs that you can use to create a photo mosaic. You could create the image from scratch with nearly any photo editing software, but the easiest way to make is to download a program that’s specifically designed to create your photo mosaic.  Some popular photo mosaic programs include Mazaika, Pro Photo Mosaic Creator, and Andrea Mosaic. You can also find some programs which are hosted online, meaning you don’t have to download them. Just visit the website and upload your photos. Mosaically and EasyMoza are both examples of this type of software, and you can upload photos from your phone, computer, or social media profiles. After you open your mosaic software, you’ll be prompted to choose a source photo. This will be the overall image that’s formed when you put the smaller images together. Scan the photo in if you want want to create a digital mosaic from a physical photo, or upload it if it’s already on your phone or computer.  The effect of a digital photo mosaic is similar to how small pixels make up a larger digital image. You can choose a photo of a person, a landscape photo, or a still object. Try to find a photo containing some color contrast, as this will make the finished project more interesting to look at. However, avoid photos with intricate details, as these can be lost in a mosaic. This will be the directory or library that the software will use to create the mosaic. Typically, you’ll need a minimum of 100-150 pictures, but the more photos you upload, the better the software will be able to match the colors in your source photo.  These may be called “cell images” in your software. You can add any pictures you like to the folder. However, you may want to use only photos which relate to your source image. For instance, if you’re creating a mosaic of a loved one, you might want to use only pictures of you and that person, if you have enough of them, or pictures of all of that person’s favorite things. Return to your photo mosaic software program and follow the prompts. When asked, choose the folder you just created and click “Upload” or “OK.” If the program won’t upload the entire folder at once, choose a few photos at a time to upload instead. The changes you can make will depend on the software program that you’re using, but many will allow you to adjust the size of the grid, the color values, the image resolution, or even the source photo, if you’re not happy with the result. You may have an option to choose the resolution of your photo. If you’re just using the photo as a phone or computer background, you can choose a lower resolution. However, if you’re planning on printing the photo, opt for a higher resolution. Consult the software’s FAQ or help page if you’re not sure what resolution to use. Once you have the mosaic exactly how you want it, follow the software program’s instructions for saving, printing, or sharing your file. If the software requires a purchase in order for you to use the file, you’ll need to enter your personal information and credit card number in order to continue.

Summary:
Install a photo mosaic software on your phone or computer. Scan in or upload the source photo for your mosaic. Make a new folder on your computer and fill it with photos for your mosaic. Select the mosaic folder in the software. Experiment with the program's settings to edit your mosaic. Save or print your photo mosaic when you’re finished.