How To Make a Grid Collage in GIMP

In this tutorial, you will learn how to create a Grid photo collage in GIMP.
Timestamps
00:00 Intro
00:12 Create a New Image
00:25 Configure Grid
00:49 Insert Image
01:31 Add Border
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Step 1: Create a New Image.
Use File-New to open the Create a new image dialog. Enter a value for the initial width with 1350 px and height with 1350 px manually or through the up and down arrows, then click OK.
Step 2: Create Grid
Step 3: Insert Image Into Document.
Use File- Open As Layers command in the top menu to open the image you'd like to insert. Click on the image, then click Open.
Step 4: Adjust Image.
Use Tools-Transform Tools-Scale command to resize the image.
Step 5: Create Selection Then Duplicate Layer.
Use Tools-Selection Tools-Rectangle Select command. To create a selection, drag your mouse over part of the image, go to Edit- Copy command, go to Edit-Paste command and then use Layer-To New Layer. Now you can delete the original image's layer.
Step 6: Add Stroke/Borders on Selection.
I will choose foreground color with white color. Use Tools-Default Colors to reset the color to default and then use Tools-Swap Colors. Right-click on your new layer/pasted layer then go to Alpha to Selection. With the selection still active, use Edit-Stroke Selection. Click “Stroke line” radio button and then click “Solid color” radio button. I will set the Line width with 50 px. Click the Stroke button.
Step 7: Insert All Images.
Repeat step 3 through 6 to open and manipulate each picture you'd like to insert.