In Photoshop, the Pixelate effect is used to make an image look blocky and less detailed. This can be done by either using the Pixelate filter or by manually setting the pixels to a specific size.
To use the Pixelate filter, go to Filter > Pixelate > Mosaic. This will bring up a dialogue box where you can set the pixel size. The larger the pixel size, the more blocky the image will appear.
You can also manually set the pixels to a specific size by going to Image > Image Size. In the dialogue box that appears, change the width and height to a specific pixel size. For example, if you want each pixel to be 10×10, you would enter 10 in both the width and height boxes.
Once you have applied the Pixelate effect, you may want to add some text to your image. To do this, go to Layer > New > Layer.
A new layer will appear in your document. Select the Type tool from the toolbar and click on the area where you want to add text. Type your text and then change the font, size, and color as desired.
To create a more dramatic effect, you can also add a black border around your image. To do this, go to Layer > New > Layer and then select the Rectangle tool from the toolbar. Click and drag around the edge of your image to create a black border.
The Pixelate effect is a great way to make an image look less detailed and more blocky. By using either the Pixelate filter or manually setting the pixels to a specific size, you can achieve this effect. You can also add text and a black border to your image to create a more dramatic effect.