How to create a "simple" collage with 25 photos

[EddievanEden]

Hi there! I need your help. I'd like to make a collage with a couple of photos - exactly 25 photos on one background, all with the same size (25 photos - 5 per row (4 rows) - 10x15cm, background would be 50x75cm, very high resolution would be preferred). I need it for an arts project. I've tried some tutorials online, but I'm failing to bring this amount of photos on "one page", all with the same size, edge to edge. Do you know where I can find a template for it? Or do know an "easy" way to get this done? I've attached a sample which I'd like to achieve in the end. THANK YOU so much for your help! Best, E.

[c.pfaffenbichler]

I would recommmend starting with the individual image dimensions, create a Group with a Layer Mask, then change the Canvas Size, duplicate and move the Groups an necessary and place the images as Smart Objects. 

[c.pfaffenbichler]

But if you have the full Cloud License I would recommend trying to do this in Indesign. 

[EddievanEden]

Thank you SO much! I'll will try this. And yes, ID is probably better for this. Thank you!

[JJMack]

A simple collage template to create. Use View Guide Layout for your layout.  However you need to improve you Math skills first  four rows of five  is twenty not twenty five.

Free Photoshop Photo Collage and Mockup Toolkit 

[JJMack]

For a simple 5x5 layout a Template is not required but being an American my script were create for my use and I use Inches not CM. Here  is a 5x5 20" x 30"  collage with 25 4"x 6" images.

 

[EddievanEden]

THANK YOU SO MUCH! That is really helpful. I'll try this path as well. And you're so right, my math skills are even worse than my PS skills. So embarassing... Again, thank you for your help!