Paint comes either already installed on, or freely available for download to, Windows-based PCs and laptops. This simplified graphics program has few tools for the professional image modifier and is not the best for correcting excessive pixelation; however, you can use the software’s resizing algorithms to smooth out the pixelation in an enlarged picture or, preferably, shrink it to a lower resolution.
Open the enlarged picture in Paint. Do this by clicking the down arrow next to the Home tab at the top and selecting “Open” from the menu.
Click on the Resize button under the Home tab. In the dialog box that opens, select the “Percentage” radio button and type "50" into both the “Horizontal” and “Vertical” text boxes. Click the “OK” button to finish. Your image shrinks in size.
Click on the Resize button a second time. Make sure the “Percentage” radio button is set, and enter "200" in both the “Horizontal” and “Vertical” text boxes. Click “OK” to complete. This returns the image to its original size, applying Paint’s smoothing algorithm to the pixelated edges of the picture.