How to simulate paper texture in GIMP

 Step 1: Launch GIMP, and select File-menu > New. Choose the height and width of your paper in pixels, and press ‘OK’. For A4 paper, the size should be 3508 x 2480 pixels.

Step 2: Select Filters-menu > Noise… and choose ‘RGB Noise’. Apart from ‘Preview’ make sure all other check-boxes are unchecked.

Step 3: Do you want your paper to be smooth, or would you like to have a texture that’s tad stronger? Take your pick as you slide the tab on ‘Red’ ‘Green’ or ‘Blue’ between 0.20 to 0.69. Do notice how all three values move in tandem. Check out the preview which may show granular dots increase or decrease in density. I prefer values between 0.20 to 0.32. Once you find a pattern to your taste, click ‘OK’.

Step 4: Go to Image-menu > Mode > Grayscale. This one step will make the dots appear more textured, and shrink your file to one-third its size in kilobytes or megabytes, which is a good thing.

Step 5: Go to Filters-menu > Blur > Gaussian Blur. Choose a value between 3 and 9 on the slider below. Check out the ‘Preview’ to see what suits your taste, and click ‘OK. You’re done. If required, you may re-apply Gaussian Blur with a different value, for an even smoother finish.

Save your file in the format of your choice, and you’re done.

Further tips:

Use the Color-menu > Brightness-Contrast slider to set the tonality of your paper.